Dual-power switching device and energy storage cabinet

Abstract

The utility model provides a dual power supply switching device and an energy storage cabinet used for an energy storage system, the dual power supply comprises a first control power supply and a second control power supply, the dual power supply comprises a first control loop, the first control loop comprises a first relay connected with the first control power supply, the first relay comprises a coil of the first relay, and the coil of the first relay is connected with the second control power supply; a first normally open contact, a second normally open contact and a first normally closed contact; the second control loop comprises a second relay connected with a second control power supply, and the second relay comprises a coil of the second relay, a third normally open contact and a second normally closed contact; and the first control loop and the second control loop are connected in parallel and are connected with a load. The dual-power-supply device provided by the utility model is small in size, can save the installation space for installing the dual-power-supply switching device in the energy storage cabinet, and is convenient to carry and install.

Description

Technical Field

[0001] This utility model relates to the field of secondary power supply in energy storage systems, specifically to a dual power switching device and an energy storage cabinet. Background Technology

[0002] Currently, dual power switching devices on the market are integrated modules, including various components such as circuit breakers, multiple contactors and relays, transfer switches, indicator lights, etc. This results in a relatively large overall size for the dual power switching device, which places stringent requirements on installation space. However, the structure of current energy storage cabinets is quite compact. For some cabinets with dual power switching requirements, it is very difficult to add a large dual power switching device to the already very compact structure. For example, some users require important components such as EMS control to be powered as a first-level load. The usual solution for this situation is to build a separate distribution box outside the cabinet and put the dual power switching device in the distribution box, or to increase the size of the energy storage cabinet to accommodate the dual power switching device. Both of these approaches result in a significant waste of space on site. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a dual power switching device and energy storage cabinet. The dual power device is small in size, which can save the installation space of the dual power switching device in the energy storage cabinet, and is easy to carry and install.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] The first aspect of this utility model discloses a dual power supply switching device for an energy storage system, wherein the dual power supply includes a first control power supply and a second control power supply, comprising:

[0006] A first control circuit, the first control circuit including a first relay connected to a first control power supply, the first relay including a coil of the first relay, a first normally open contact, a second normally open contact and a first normally closed contact;

[0007] The second control circuit includes a second relay connected to a second control power supply, the second relay including a coil, a third normally open contact and a second normally closed contact;

[0008] The first control loop and the second control loop are connected in parallel and connected to the load.

[0009] The double power switching device is formed by the first relay and the second relay, the first relay and the second relay are small in size, the double power switching device is small in size and is convenient to install in a compact energy storage cabinet, the double power switching device arranged according to the scheme is simple in overall structure and simple in installation mode, and the size of the energy storage cabinet or the structure of the energy storage cabinet does not need to be increased.

[0010] Further, the first relay is closed, and the second relay is opened; the first relay is opened, and the second relay is closed.

[0011] The first relay and the second relay are interlocked and controlled, so that one and only one of the first relay and the second relay is in a closed state, the load can work normally, two power supplies are prevented from being powered at the same time, and faults such as short circuit are avoided, and the stability and safety of double power switching and power supply are improved.

[0012] Further, the first control power supply is powered, the second control power supply is powered off, the first relay is closed, and the second relay is opened; the first control power supply is powered off, the second control power supply is powered on, the first relay is opened, and the second relay is closed; and the first control power supply and the second control power supply are both powered on, the first relay is closed, and the second relay is opened. By reasonably setting the normally open and closed contacts of the first relay and the relay, the mutual switching of the first control power supply and the second control power supply does not affect the single power supply to the load.

[0013] Further, the coil of the first relay and the first normally open contact are connected in series with the first control power supply, the coil of the first relay is connected in series with the second normally open contact, the coil of the first relay is connected in series with the second normally closed contact, and the second normally open contact and the second normally closed contact are connected in parallel.

[0014] Further, when the first control power supply is powered and the second control power supply is powered off, the coil of the first relay forms a loop with the first control power supply through the second normally closed contact, and the first normally open contact and the second normally open contact are closed.

[0015] Further, the coil of the second relay and the third normally open contact are connected in series with the second control power supply, and the coil of the second relay is connected in series with the first normally closed contact.

[0016] Further, when the first control power supply is powered off and the second control power supply is powered on, the coil of the second relay forms a loop with the second control power supply through the first normally closed contact, and the third normally open contact is closed.

[0017] Further, the working voltage of the first relay and the second relay is 220V.

[0018] The utility model discloses a second aspect discloses a kind of energy storage cabinet, the energy storage cabinet includes the double power switching device of any one described in first aspect.

[0019] Further, the energy storage cabinet further includes auxiliary electrical equipment, the auxiliary electrical equipment at least includes energy management system, battery management system, fire-fighting system and energy storage converter, the double power switching device is connected with at least one in the auxiliary electrical equipment. By connecting the double power switching device with the device having remote signaling function in the energy storage cabinet, i.e. auxiliary electrical equipment, the current power supply state can be detected according to the opening and closing state of the relay, compared with the existing double power switching device which needs to prompt the state through indicator light, not only simple structure and principle, but also easy to operate.

[0020] Due to the use of the above technical solution, the utility model has the following advantages compared with the prior art:

[0021] 1. The double power switching device is formed by the first relay and the second relay, the first relay and the second relay are small in size, the double power switching device formed is small in size, and is convenient to install in the energy storage cabinet with compact space. The double power switching device arranged according to the above scheme has simple overall structure, and the installation mode is simple, without the need to increase the size of the energy storage cabinet or change the structure of the energy storage cabinet.

[0022] 2. The first relay and the second relay are interlocked controlled, so that one and only one of the first relay and the second relay is in a closed state, the load can work normally, and two power supplies are prevented from supplying power at the same time, so as to avoid faults such as short circuit, and improve the stability and safety of double power switching and power supply.

[0023] In order to make the above and other purposes, characteristics and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0025] Figure 1 is the loop structure diagram of the double power switching device provided by the utility model embodiment;

[0026] Figure 2 is the loop structure diagram of the first control power supply of the double power switching device provided by the utility model embodiment;

[0027] Figure 3 is a loop structure diagram of the second control power supply of the dual power supply switching device provided in the embodiment of the utility model;

[0028] Figure 4 is a loop structure diagram of the first control power supply and the second control power supply provided in the embodiment of the utility model. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. In addition, the drawings of the utility model are only simple schematic illustrations, not the depiction of actual dimensions, and the prior declaration is made.

[0030] In the utility model, it needs to be explained that the directions or position relationships indicated by the terms "upper", "lower", "inner", "outer", "forward", "backward", "between", "close to" and "far away" are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as limiting the utility model in that the indicated devices or elements must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as limiting the utility model. It also needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting" and "connection" should be understood broadly, for example, they can be fixed connection, can be detachable connection, or integrally connected; they can be directly connected, or indirectly connected. For ordinary skilled persons in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0031] It should be understood that although the terms "first", "second", "third" and the like can be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein can include any one or more combinations of the associated listed items.

[0032] Referring to Figures 1-4 The embodiment of the present application provides a dual power supply switching device, which is used in an energy storage system and comprises a first relay KA1 and a second relay KA2, and a plurality of connection lines connected with a power supply and a load in the energy storage system. The dual power supply switching device provided by the embodiment of the present application is composed of only the first relay and the second relay, has a small volume, and is convenient to install in a compact energy storage cabinet.

[0033] Specifically, as Figure 1As shown, the dual power switching device comprises: a first control circuit and a second control circuit connected in parallel with the first control circuit, the first control circuit comprises a first control power S1 and a first relay KA1 connected with the first control power S1, the first relay KA1 comprises a coil of the first relay KA1, a first normally open contact KA1(1), a second normally open contact KA1(3) and a first normally closed contact KA1(2).

[0034] The second control circuit comprises a second control power S2 and a second relay KA2 connected with the second control power S2, the second relay KA2 comprises a coil of the second relay KA2, a third normally open contact KA2(1) and a second normally closed contact KA2(2).

[0035] In a possible embodiment, the first control power S1 is the main power of the energy storage cabinet, and the second control power S2 is the standby power of the energy storage cabinet. As one or more embodiments, the rated working voltage of the first control power S1 and the second control power S2 is 220V.

[0036] After connecting the first control circuit and the second control circuit in parallel with the load, the dual power switching can be realized through the interlocking of the first relay KA1 and the second relay KA2, that is, when the first relay KA1 is closed, the second relay KA2 is disconnected, and when the first relay KA1 is disconnected, the second relay KA2 is closed, thereby avoiding short circuit and other faults caused by simultaneous power supply of two power supplies.

[0037] Specifically, when the first control power S1 is powered and the second control power S2 is powered off, the first relay KA1 is closed and the second relay KA2 is disconnected; when the first control power S1 is powered off and the second control power S2 is powered, the first relay KA1 is disconnected and the second relay KA2 is closed; and when the first control power S1 and the second control power S2 are both powered, the first relay KA1 is closed and the second relay KA2 is disconnected.

[0038] As shown in the figure, Figure 1 The coil of the first relay KA1 and the first normally open contact KA1(1) are connected in series with the first control power S1, the coil of the first relay KA1 is connected in series with the second normally open contact KA1(3), the coil of the first relay KA1 is connected in series with the second normally closed contact KA2(2), and the second normally open contact KA1(3) and the second normally closed contact KA2(2) are connected in parallel. Thus, when the first relay KA1 is powered, the first normally closed contact KA1(2) of the first relay KA1 can disconnect the second control circuit.

[0039] The first normally open contact KA1 (1) is connected in series between the first control power supply S1 and the load, and in operation, the first normally open contact KA1 (1) forms a loop with the first control power supply S1 and the load, the second normally open contact KA1 (3) forms a loop with the coil of the first relay KA1 and the first control power supply S1, and the second normally closed contact KA2 (2) forms a loop with the coil of the first relay KA1 and the first control power supply S1.

[0040] The coil of the second relay KA2 and the third normally open contact KA2 (1) are both connected in series with the second control power supply S2, and the coil of the second relay KA2 is connected in series with the first normally closed contact KA1 (2). Thus, when the second relay KA2 is powered, the second normally closed contact KA2 (2) of the second relay KA2 can disconnect the first control loop.

[0041] The third normally open contact KA2 (1) is connected in series between the second control power supply S2 and the load, and in operation, the third normally open contact KA2 (1) forms a loop with the second control power supply S2 and the load, and the first normally closed contact KA1 (2) forms a loop with the coil of the second relay KA2 and the second control power supply S2.

[0042] The specific working principle is as follows:

[0043] When the first control power supply S1 and the second control power supply S2 are both powered off, the state of the dual power supply switching device is as shown in Figure 1 The first normally open contact KA1 (1) of the load loop and the third normally open contact KA2 (1) of the load loop are both disconnected;

[0044] When the first control power supply S1 is powered on and the second control power supply S2 is powered off, the state of the dual power supply switching device is as shown in Figure 2 At the same moment of power-on, the coil of the first relay KA1 forms a loop with the first control power supply S1 through the second normally closed contact KA2 (2), the coil of the first relay KA1 is powered on, the first control power supply S1 and the first normally open contact KA1 (1) of the load loop are closed, the first normally closed contact KA1 (2) of the first relay KA1 is disconnected, and the second control power supply S2 is disconnected from the load loop. At this time, the first control power supply S1 supplies power to the load;

[0045] When the first control power supply S1 is powered off and the second control power supply S2 is powered on, the state of the dual power supply switching device is as shown in Figure 3As shown, at the same moment of power-up, the coil of the second relay KA2 forms a loop with the first normally closed contact KA1(2) and the second control power supply S2, the coil of the second relay KA2 is powered, the second control power supply S2 is closed with the third normally open contact KA2(1) of the load loop, the second normally closed contact KA2(2) of the second relay KA2 is opened, and the first control power supply S1 is disconnected with the load loop; at this time, the second control power supply S2 supplies power to the load.

[0046] When the first control power supply S1 and the second control power supply S2 are both powered, the state of the dual power supply switching device is as shown in Figure 4 As shown, at the same moment of power-up, the coil of the second relay KA2 forms a loop with the first normally closed contact KA1(2) and the second control power supply S2, the coil of the second relay KA2 is powered, the second control power supply S2 is closed with the third normally open contact KA2(1) of the load loop, the second normally closed contact KA2(2) of the second relay KA2 is opened, and the first control power supply S1 is disconnected with the load loop; at this time, the second control power supply S2 supplies power to the load.

[0047] Due to the arrangement of the first normally open contact KA1(1), the second normally open contact KA1(3) and the first normally closed contact KA1(2) of the first relay KA1 and the third normally open contact KA2(1) and the second normally closed contact KA2(2) of the second relay KA2, the dual power supply does not affect the single power supply to the load when any power supply is powered and switched, and the dual power supply switching device arranged according to the above embodiment has a simple overall structure and a simple installation method, and can be fixed in the energy storage cabinet through a guide rail without increasing the size of the energy storage cabinet or changing the structure of the energy storage cabinet. The simple dual power supply switching device of the utility model can effectively solve the problems of large size and large space occupation of the dual power supply switching device in the current energy storage system, and has simple operation. When testing the cabinet, the dual power supply switching device described above can be temporarily built to test the corresponding functions of the cabinet.

[0048] It should be noted that the dual power supply switching device provided by the embodiments of the present application is provided with two relays for dual power supply switching. When more than two power supplies are switched, only the corresponding number of relays need to be added.

[0049] The application further provides a storage energy cabinet, which comprises a battery stack, an energy management system, a battery management system, a storage energy converter, secondary auxiliary equipment and a fire extinguishing system, the secondary auxiliary equipment is various, such as lighting lamps, dehumidifiers, fans and the like, and the dual-power switching device is connected with at least one of the secondary auxiliary equipment, the energy management system, the battery management system and the fire extinguishing system. By connecting the dual-power switching device with a device having a remote signaling function in the storage energy cabinet, the current power supply state can be detected according to the opening and closing state of the relay, compared with the existing dual-power switching device which needs to prompt the state through an indicating lamp, the structure and principle are simple, and the operation is convenient. The remote signaling function refers to monitoring and transmitting the device state information through communication technology, specifically, the remote signaling function is used for collecting and transmitting various protection and switching value information, such as a position signal of a measuring switch, an action signal of a protection device, a communication device operating condition signal and the like, in the application, the contact state of the relay can be detected through the remote signaling function of the device, so that the current main / backup power supply condition and the load power supply condition can be detected.

[0050] The principle and implementation mode of the utility model are described by the specific embodiments in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field, and according to the above, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A dual power switching device for an energy storage system, the dual power comprising a first control power and a second control power, characterized in that, The utility model relates to a dual power supply switching device, comprising: a first control circuit comprising a first relay connected with a first control power supply, the first relay comprising a coil of the first relay, a first normally open contact, a second normally open contact and a first normally closed contact; a second control circuit comprising a second relay connected with a second control power supply, the second relay comprising a coil of the second relay, a third normally open contact and a second normally closed contact; the first control circuit and the second control circuit are connected in parallel and connected with a load.

2. A dual power switching device according to claim 1, wherein When the first relay is closed, the second relay is open; when the first relay is open, the second relay is closed.

3. A dual power switching device according to claim 2, wherein When the first control power supply is powered and the second control power supply is powered off, the first relay is closed and the second relay is open; when the first control power supply is powered off and the second control power supply is powered, the first relay is open and the second relay is closed; when the first control power supply and the second control power supply are both powered, the first relay is closed and the second relay is open.

4. The dual power switching device of claim 1, wherein, The coil of the first relay and the first normally open contact are connected in series with the first control power supply; the coil of the first relay is connected in series with the second normally open contact; the coil of the first relay is connected in series with the second normally closed contact; the second normally open contact and the second normally closed contact are connected in parallel.

5. A dual power switching device according to claim 4, wherein, When the first control power supply is powered and the second control power supply is powered off, the coil of the first relay forms a loop with the first control power supply through the second normally closed contact, and the first normally open contact and the second normally open contact are closed.

6. A dual power switching device according to claim 1, wherein The coil of the second relay and the third normally open contact are connected in series with the second control power supply; the coil of the second relay is connected in series with the first normally closed contact.

7. A dual power switching device according to claim 6, wherein When the first control power supply is powered off and the second control power supply is powered, the coil of the second relay forms a loop with the second control power supply through the first normally closed contact, and the third normally open contact is closed.

8. A dual power switching device according to claim 1, wherein The working voltage of the first relay and the second relay is 220V.

9. An energy storage cabinet characterized by, The energy storage cabinet comprises the dual power supply switching device according to any one of claims 1-8.

10. An energy storage cabinet according to claim 9, wherein, The energy storage cabinet comprises a battery stack, an energy management system, a battery management system, an energy storage converter, secondary auxiliary equipment and a fire extinguishing system, the secondary auxiliary equipment at least comprising a lighting lamp, a dehumidifier and a fan, and the dual power supply switching device is connected with at least one of the secondary auxiliary equipment, the energy management system, the battery management system and the fire extinguishing system.

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