Dual-power circuit of energy storage system and energy storage system

Abstract

The embodiment of the utility model discloses a dual power supply circuit of an energy storage system and the energy storage system, the dual power supply circuit comprises a power supply module, a main power supply module, a standby power supply module, a dual conversion contact module and a load, the power supply module comprises a first interface and a second interface; the main power supply module is connected to the first interface through a first loop, and the main power supply module is connected to the second interface through a second loop; the standby power supply module is connected to the first loop through a first branch, and the standby power supply module is connected to the second loop through a second branch; the double-conversion contact module is connected with the main power supply module and the standby power supply module. And the load is connected with the main power supply module and the standby power supply module through the double-conversion contact module, so that the safety of the energy storage system can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a dual power supply circuit of an energy storage system and the energy storage system. BACKGROUND

[0002] With the development of renewable energy generation and smart grid technology, energy storage systems play an increasingly important role in balancing grid load and improving energy utilization efficiency. However, the battery management system (BMS) in the energy storage system, as a key component for monitoring battery status and ensuring safe operation of the battery, its power supply stability and reliability are directly related to the efficiency and safety of the entire energy storage system. Traditionally, the power supply of BMS depends on a single external power supply. Once the main power supply fails, the BMS loses power support, which may lead to uncontrolled battery management and even safety accidents. CONTENT OF THE UTILITY MODEL

[0003] The embodiments of the present application provide a dual power supply circuit of an energy storage system and the energy storage system, which can conveniently access a backup power supply, avoid the BMS losing power support when the main power supply fails, and thus improve the safety of the energy storage system.

[0004] The embodiments of the present application provide a dual power supply circuit of an energy storage system, which comprises:

[0005] A power supply module, which comprises a first interface and a second interface;

[0006] A main power supply module, which is connected to the first interface through a first loop, and connected to the second interface through a second loop;

[0007] A backup power supply module, which is connected to the first loop through a first branch, and connected to the second loop through a second branch;

[0008] A dual conversion contact module, which is connected to the main power supply module and the backup power supply module respectively;

[0009] A load, which is connected to the main power supply module and the backup power supply module through the dual conversion contact module.

[0010] Optionally, in some embodiments of the present application, the dual conversion contact module comprises a conversion relay, a coil, a first switch and a second switch;

[0011] One side of the coil is connected to the positive pole of the main power supply module through a first sub-branch, and the other side of the coil is connected to the conversion relay through a second sub-branch and to the negative pole of the main power supply module;

[0012] The positive pole of the main power module or the positive pole of the backup power module is connected to the first switch, and the negative pole of the main power module or the negative pole of the backup power module is connected to the second switch.

[0013] Optionally, in some embodiments of the present application, the first switch comprises a first end, a second end and a third end, and the second switch comprises a fourth end, a fifth end and a sixth end.

[0014] The positive pole of the main power module is connected to the first end, and the positive pole of the backup power module is connected to the second end; the negative pole of the main power module is connected to the fourth end, and the negative pole of the backup power module is connected to the fifth end; the first end or the second end is connected to the third end, and the fourth end or the fifth end is connected to the sixth end.

[0015] Optionally, in some embodiments of the present application, the first end is connected to the third end, and the fourth end is connected to the sixth end, and the main power module supplies power to the load.

[0016] Optionally, in some embodiments of the present application, the second end is connected to the third end, and the fifth end is connected to the sixth end, and the backup power module supplies power to the load.

[0017] Optionally, in some embodiments of the present application, the load comprises a load unit and a capacitor, the load unit is connected to the double-conversion contact module through a third branch and a fourth branch, and the capacitor is arranged between the third branch and the fourth branch.

[0018] Optionally, in some embodiments of the present application, the discharge time of the capacitor is greater than the switching time of the double-conversion contact module.

[0019] Optionally, in some embodiments of the present application, the rated voltage of the capacitor is higher than the working voltage provided by the power supply module.

[0020] Optionally, in some embodiments of the present application, the power supply module further comprises a power switch, the power switch is arranged on the first branch, and the power switch is located between the first interface and the main power module.

[0021] Correspondingly, the present application also provides an energy storage system comprising the double-power supply circuit of the energy storage system according to any one of the embodiments of the present application.

[0022] The embodiment of the present application provides a dual power supply circuit of an energy storage system and the energy storage system, which comprises a power supply module, a main power supply module, a backup power supply module, a dual conversion contact module and a load, wherein the power supply module comprises a first interface and a second interface; the main power supply module is connected to the first interface through a first loop, and the main power supply module is connected to the second interface through a second loop; the backup power supply module is connected to the first loop through a first branch, and the backup power supply module is connected to the second loop through a second branch; the dual conversion contact module is connected with the main power supply module and the backup power supply module respectively; and the load is connected with the main power supply module and the backup power supply module through the dual conversion contact module. The dual power supply circuit of the energy storage system provided by the present application adopts the dual conversion contact module connected with the main power supply module and the backup power supply module, can conveniently access the backup power supply, avoids that the BMS loses power support when the main power supply fails, and thus the safety of the energy storage system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0024] Figure 1 It is a structural schematic diagram of the dual power supply circuit of the energy storage system provided by the embodiment of the present application.

[0025] Figure 2 It is another structural schematic diagram of the dual power supply circuit of the energy storage system provided by the embodiment of the present application.

[0026] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. Through the above drawings, the specific embodiments of the present application have been shown, and more detailed description will be given in the following. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort are within the scope of protection of the present application. In the case of no conflict, each of the following embodiments and technical features can be combined with each other.

[0028] The following will be described in detail respectively. It should be noted that the description order of the following embodiments is not limited as the priority order of the embodiments.

[0029] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the dual power supply circuit of the energy storage system provided in the embodiment of the present application.

[0030] In the embodiment, a dual power supply circuit of an energy storage system is provided, which can specifically include a power supply module 10, a main power supply module 20, a backup power supply module 30, a dual conversion contact module 40, and a load 50. The power supply module 10 includes a first interface 101 and a second interface 102. The main power supply module 20 is connected to the first interface 101 through a first loop, and is connected to the second interface 102 through a second loop. The backup power supply module 30 is connected to the first loop through a first branch, and is connected to the second loop through a second branch. The dual conversion contact module 40 is connected to the main power supply module 20 and the backup power supply module 30 respectively. The load 50 is connected to the main power supply module 20 and the backup power supply module 30 through the dual conversion contact module 40 respectively.

[0031] The power supply module 10 is the basis of the entire dual power supply system, which ensures that the main power supply module and the backup power supply module can obtain the required AC power, thereby providing the necessary DC power for the system.

[0032] For example, the power supply module 10 receives 24V DC power from the main power supply module 20 through the first interface 101. The main power supply module 20 can be an AC / DC converter, which converts 220V AC power into 24V DC power. The power supply module 10 distributes the received 24V DC power to the load through the internal circuit. When the main power supply module 20 fails to provide power, the power supply module 10 can receive 24V DC power from the backup power supply module 30 through the second interface 102. The backup power supply module 30 can also be an AC / DC converter, which starts to work when the main power supply fails to provide the same 24V DC power.

[0033] The dual-conversion contact module 40 is a key component in the dual-power circuit design. It is responsible for automatically switching between the main power module and the backup power module to ensure continuous power supply to the load 50 (such as the BMS battery management system). The dual-conversion contact module 40 may contain contacts, which can be mechanical or electronic, for switching the circuit between the main power module 20 and the backup power module 30. During switching, the dual-conversion contact module 40 can provide brief power interruption protection to prevent voltage fluctuations from damaging the load 50. In the high-voltage box of the energy storage system, if the main power module 20 suddenly fails, the dual-conversion contact module 40 will automatically switch the circuit from the main power supply to the backup power module 30 upon detecting this. This process is seamless for the BMS battery management system, ensuring that the system can continue to monitor and manage the battery status without service interruption due to power failure. When the main power module 20 is repaired and back online, the dual-conversion contact module 40 will automatically switch back to the main power supply, ensuring the system operates under optimal power supply.

[0034] Load 50 refers to electronic devices or systems that require a stable power supply to ensure normal operation. Optionally, in some embodiments of this application, load 50 may be a battery management system (BMS), a control unit, or a communication device.

[0035] Optionally, in some embodiments of this application, please refer to Figure 2 The dual-contact switching module 40 includes a switching relay 401, a coil 402, a first switch 403, and a second switch 404. One side of the coil 402 is connected to the positive terminal of the main power module 20 via a first sub-branch, and the other side of the coil 402 is connected to the switching relay 401 via a second sub-branch and is also connected to the negative terminal of the main power module 20. The positive terminal of the main power module 20 or the positive terminal of the backup power module 30 is connected to the first switch 403, and the negative terminal of the main power module 20 or the negative terminal of the backup power module 30 is connected to the second switch 404.

[0036] A switching relay 401 is used to control the switching of power between the main power supply and the backup power supply. The switching relay 401 can be an electromagnetic relay, and its operation is controlled by the activation state of the coil 402. When current flows through the coil 402, a magnetic field is generated, causing the contacts of the switching relay 401 to change state, thereby achieving power switching. The state of the first switch 403 is controlled by the switching relay 401 to ensure that only one power source supplies power to the load at any given time. Similar to the first switch 403, the second switch 404 is also controlled by a relay to ensure the synchronicity of power switching. Under normal operating conditions, the coil 402 is not activated, and the first switch 403 and the second switch 404 are connected to the positive and negative terminals of the main power module 20, providing power to the load. When the main power module 20 fails, the coil 402 is activated, causing the contacts of the switching relay 401 to change state, thereby disconnecting from the main power module 20 and simultaneously connecting to the positive and negative terminals of the backup power module 30, ensuring that the load continues to receive power. When the main power module 20 returns to normal, the coil 402 changes state again, disconnects from the backup power module 30, and reconnects to the main power module 20 to restore the main power supply.

[0037] Optionally, in some embodiments of this application, the first switch 403 includes a first terminal 403a, a second terminal 403b, and a third terminal 403c, and the second switch 404 includes a fourth terminal 404a, a fifth terminal 404b, and a sixth terminal 404c. The positive terminal of the main power module 20 is connected to the first terminal 403a, and the positive terminal of the backup power module 30 is connected to the second terminal 403b. The negative terminal of the main power module 20 is connected to the fourth terminal 404a, and the negative terminal of the backup power module is connected to the fifth terminal 404b. The first terminal 403a or the second terminal 403b is connected to the third terminal 403c, and the fourth terminal 404a or the fifth terminal 404b is connected to the sixth terminal 404c.

[0038] Specifically, the first terminal 403a is connected to the positive input terminal of the main power module 20, and the second terminal 403b is connected to the positive input terminal of the backup power module 30. Depending on the state of the first switch 403, the third terminal 403c will be connected to either the first terminal 403a or the second terminal 403b, thereby selecting either the main power supply or the backup power supply to power the load. The fourth terminal 404a is connected to the negative input terminal of the main power module 20, and the fifth terminal 404b is connected to the negative input terminal of the backup power module 30. Depending on the state of the second switch 404, the sixth terminal 404c will be connected to either the fourth terminal 404a or the fifth terminal 404b, thereby selecting either the main power supply or the backup power supply to power the load.

[0039] For example, under normal operating conditions, the first terminal 403a of the first switch 403 is connected to the third terminal 403c, and the fourth terminal 404a of the second switch 404 is connected to the sixth terminal 404c. In this way, the main power module 20 supplies power to the load. When the main power module 20 fails, the first switch 403 and the second switch 404 switch states, disconnecting the first terminal 403a from the second terminal 403b and connecting the second terminal 403b to the third terminal 403c; simultaneously, the fourth terminal 404a disconnects from the fifth terminal 404b and connects the fifth terminal 404b to the sixth terminal 404c. In this way, the backup power module 30 takes over supplying power to the load. When the main power module 20 returns to normal operation, the first switch 403 and the second switch 404 switch back to their original states, restoring the main power supply.

[0040] Optionally, in some embodiments of this application, the first terminal 403a is connected to the third terminal 403c, and the fourth terminal 404a is connected to the sixth terminal 404c, so that the main power module 20 supplies power to the load 50. That is, if the main power module 20 fails, the relay in the double-change contact module 40 will detect this change and automatically switch the contact state. The third terminal 403c of the first switch 403 will switch from the first terminal 403a to the second terminal 403b, and the sixth terminal 404c of the second switch 404 will switch from the fourth terminal 404a to the fifth terminal 404b, thereby switching the power supply to the load 50 from the main power module 20 to the backup power module 30.

[0041] Optionally, in some embodiments of this application, the second terminal 403b is connected to the third terminal 403c, and the fifth terminal 404b is connected to the sixth terminal 404c. The backup power module 30 supplies power to the load 50. That is, when the main power module 20 fails or cannot provide power, the relay in the double-change contact module 40 will detect this change and automatically switch the contact state. The third terminal 403c of the first switch 403 will switch from the first terminal 403a to the second terminal 403b, and the sixth terminal 404c of the second switch 404 will switch from the fourth terminal 404a to the fifth terminal 404b, thereby switching the power supply to the load 50 from the main power module 20 to the backup power module 30.

[0042] Please continue reading. Figure 2 Optionally, in some embodiments of this application, the load 50 includes a load unit 501 and a capacitor 502. The load unit 501 is connected to the double conversion contact module 40 through a third branch and a fourth branch, and the capacitor 502 is disposed between the third branch and the fourth branch.

[0043] The load unit 501 receives and uses the power provided by the double-conversion contact module 40. The load unit 501 can be any device or system component that requires power to perform its functions, such as a BMS (Battery Management System) responsible for monitoring and managing the charging and discharging process of the battery to ensure battery safety and extend battery life; it can also be a control unit used to execute specific control logic, such as motor control, temperature regulation, etc.; or it can be a communication device, such as a router or modem, used for data transmission and communication.

[0044] Capacitor 502 can absorb and release charge, helping to maintain the voltage stability of load unit 501. When the power supply voltage fluctuates slightly, the capacitor can provide or absorb additional current to reduce voltage changes. When the power module (whether it is the main power supply or the backup power supply) is supplying power normally, capacitor 502 charges and stores a certain amount of energy. When a power failure is detected or during power switching, capacitor 502 releases the stored energy to provide power to load unit 501 until a new power module takes over the power supply. Through the charging and discharging process, capacitor 502 helps maintain the voltage of load unit 501 within a certain range, reducing the impact of voltage fluctuations on the load. It should be noted that the rated voltage of capacitor 502 is higher than the highest operating voltage in the circuit to ensure that capacitor 502 will not be damaged during normal operation. That is, optionally, in some embodiments of this application, the rated voltage of capacitor 502 is higher than the operating voltage provided by power supply module 10; optionally, the rated voltage of capacitor 502 is 1.2-1.5 times the operating voltage provided by power supply module 10.

[0045] Optionally, in some embodiments of this application, the discharge time of capacitor 502 is greater than the switching time of the double-change contact module 40. The discharge time refers to the time required for capacitor 502 to discharge from a fully charged state until the voltage drops to a point where it can no longer provide sufficient power to the load. The switching time refers to the time required for the double-change contact module 40 to switch from the main power supply to the backup power supply (or vice versa). This time is typically very short, possibly ranging from a few milliseconds (ms) to tens of milliseconds, depending on the design of the relay or other switching mechanism. During power switching, the discharge time of capacitor 502 must be long enough to cover the switching time. This ensures that even during switching, capacitor 502 can continue to provide power to load 50, preventing the load from being affected by momentary power interruptions.

[0046] Optionally, in some embodiments of this application, the power supply module 10 further includes a power switch 103, which is disposed on the first branch and located between the first interface 101 and the main power module 20.

[0047] The power switch 103 allows the operator to manually control the power supply to the power supply module 10. By turning this switch on or off, the power supply to the main power module 20 can be controlled. In maintenance or emergency situations, the power switch 103 can quickly cut off the power supply to ensure personnel safety and equipment protection.

[0048] For example, when power switch 103 is closed, power flows from the first interface 101 through power switch 103 to the main power module 20, and then the converted DC power is supplied to the load 50. When power switch 103 is opened, the power supply is cut off, the main power module 20 stops working, and the load 50 is powered by the backup power module 30. In case of maintenance of the main power module 20 or in case of an emergency, power switch 103 can quickly cut off the power supply to ensure safety.

[0049] In summary, this embodiment provides a dual-power circuit for an energy storage system, comprising: a power supply module 10, a main power supply module 20, a backup power supply module 30, a dual-conversion contact module 40, and a load 50. The power supply module 10 includes a first interface 101 and a second interface 102. The main power supply module 20 is connected to the first interface 101 via a first circuit and to the second interface 102 via a second circuit. The backup power supply module 30 is connected to the first circuit via a first branch and to the second circuit via a second branch. The dual-conversion contact module 40 is connected to both the main power supply module 20 and the backup power supply module 30. The load 50 is connected to both the main power supply module 20 and the backup power supply module 30 via the dual-conversion contact module 40. The dual-power circuit for the energy storage system provided in this application, by using the dual-conversion contact module 40 connected to both the main power supply module 20 and the backup power supply module 30, allows for convenient access to the backup power supply, preventing the BMS from losing power support in the event of a main power supply failure, thereby improving the safety of the energy storage system.

[0050] Accordingly, this application also provides an energy storage system, which includes the dual power supply circuit of the energy storage system provided in any of the above embodiments.

[0051] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, such as the combination of technical features between embodiments, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

[0052] Furthermore, for structural elements with the same or similar characteristics, this application may use the same or different reference numerals for identification. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] In this application, the word "for example" is used to mean "used as an example, illustration, or explanation." Any embodiment described as "for example" in this application is not necessarily to be construed as more preferred or advantageous than other embodiments. This application has been provided above to enable any person skilled in the art to make and use it. Various details are set forth in the above description for purposes of explanation.

[0054] It should be understood that those skilled in the art will recognize that this application can be implemented without using these specific details. In other embodiments, well-known structures and processes will not be described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed herein.

[0055] The above provides a detailed description of a dual-power supply circuit for an energy storage system provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A dual-power supply circuit for an energy storage system, characterized in that, include: The power supply module includes a first interface and a second interface; The main power module is connected to the first interface via a first circuit, and the main power module is connected to the second interface via a second circuit. A backup power module, wherein the backup power module is connected to the first circuit via a first branch and to the second circuit via a second branch; A dual-conversion contact module, wherein the dual-conversion contact module is connected to the main power module and the backup power module respectively; The load is connected to the main power module and the backup power module respectively through the dual conversion contact module.

2. The dual power supply circuit according to claim 1, characterized in that, The dual-change contact module includes a changeover relay, a coil, a first switch, and a second switch; One side of the coil is connected to the positive terminal of the main power module through a first sub-branch, and the other side of the coil is connected to the conversion relay through a second sub-branch and to the negative terminal of the main power module. The positive terminal of the main power module or the positive terminal of the backup power module is connected to the first switch, and the negative terminal of the main power module or the negative terminal of the backup power module is connected to the second switch.

3. The dual power supply circuit according to claim 2, characterized in that, The first switch includes a first terminal, a second terminal, and a third terminal; the second switch includes a fourth terminal, a fifth terminal, and a sixth terminal. The positive terminal of the main power module is connected to the first terminal, and the positive terminal of the backup power module is connected to the second terminal; the negative terminal of the main power module is connected to the fourth terminal, and the negative terminal of the backup power module is connected to the fifth terminal; the first terminal or the second terminal is connected to the third terminal, and the fourth terminal or the fifth terminal is connected to the sixth terminal.

4. The dual power supply circuit according to claim 3, characterized in that, The first terminal is connected to the third terminal, and the fourth terminal is connected to the sixth terminal, and the main power module supplies power to the load.

5. The dual power supply circuit according to claim 3, characterized in that, The second terminal is connected to the third terminal, and the fifth terminal is connected to the sixth terminal, and the backup power module supplies power to the load.

6. The dual power supply circuit according to claim 1, characterized in that, The load includes a load unit and a capacitor. The load unit is connected to the dual-conversion contact module through a third branch and a fourth branch. The capacitor is disposed between the third branch and the fourth branch.

7. The dual power supply circuit according to claim 6, characterized in that, The discharge time of the capacitor is greater than the switching time of the dual-conversion contact module.

8. The dual power supply circuit according to claim 6, characterized in that, The rated voltage of the capacitor is higher than the operating voltage provided by the power supply module.

9. The dual power supply circuit according to claim 1, characterized in that, The power supply module also includes a power switch, which is disposed on the first branch and located between the first interface and the main power supply module.

10. An energy storage system, characterized in that, Includes a dual power supply circuit for the energy storage system as described in any one of claims 1 to 9.

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