Energy storage power supply circuit and energy storage system

Abstract

The utility model discloses a kind of energy storage power supply circuit and energy storage system. Energy storage power supply circuit includes: energy storage battery, contactor and relay. Contactor is connected DC power supply, energy storage battery respectively, relay is connected contactor, energy storage battery and management control panel respectively;Contactor is connected with management control panel communication. By being arranged between energy storage battery and management control panel relay, management control panel can be controlled by power-on instruction relay closure, so that energy storage battery, relay and management control panel form power supply loop, i. e. energy storage battery is powered for management control panel by relay, and uninterrupted power supply is realized after system power failure Energy storage battery is for management control panel. In addition, management control panel can also be controlled by power-off instruction to disconnect the relay to cut off the power supply loop, prevent energy storage battery long time power failure overdischarge.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to an energy storage power supply circuit and energy storage system. Background Technology

[0002] In related technologies, the management control board (MMCB) of energy storage devices typically draws its power from the power conversion system (PCS), and the power supply circuit passes through a relay. When the system loses power, the relay disconnects, causing the management control board to lose power. In other related technologies, the management control board draws its power from the battery, but an additional circuit breaker needs to be added to the positive terminal. The power supply to the management control board is controlled by manually closing or opening the circuit breaker.

[0003] In the first method, the management control board loses power when the system is powered off, and the backend cannot detect the cell status in real time, making it impossible for the management control board to provide uninterrupted power. In the second method, the circuit breaker needs to be manually closed or opened. If the circuit breaker is not opened after the energy storage system is powered off, prolonged storage may lead to severe power loss or even over-discharge of the energy storage battery.

[0004] Therefore, the management and control board in the relevant technology has technical problems such as the inability to provide uninterrupted power supply when the system is powered off and the over-discharge of the energy storage battery when the energy storage system is powered off and idle. Utility Model Content

[0005] This utility model provides an energy storage power supply circuit and an energy storage system to solve the technical problems in related technologies, such as the inability of the management control board to provide uninterrupted power supply when the system is powered off and the over-discharge of the energy storage battery when the energy storage system is powered off and idle.

[0006] This utility model provides an energy storage power supply circuit, which is connected to a DC power supply and a management control board respectively. The energy storage power supply circuit includes:

[0007] Energy storage batteries, contactors, and relays;

[0008] The contactor is connected to the DC power supply and the energy storage battery respectively, and the relay is connected to the contactor, the energy storage battery and the management control board respectively; the contactor and the management control board are connected in communication.

[0009] The management control board is used to control the contactor to close according to the power-on command, so that the DC power supply, contactor and energy storage battery form a charging and discharging circuit; and to control the relay to close, so that the energy storage battery, relay and management control board form a power supply circuit.

[0010] The management control board is also used to control the contactor to disconnect according to the power-down command, so as to cut off the charging and discharging circuit; and to control the relay to disconnect to cut off the power supply circuit.

[0011] In a further embodiment, the energy storage power supply circuit further includes:

[0012] A DC / DC converter, which is connected to the energy storage battery, relay and management control board respectively;

[0013] A DC / DC converter is used to convert the DC power from the energy storage battery to power the management control board.

[0014] In a further embodiment, the energy storage power supply circuit further includes:

[0015] Auxiliary power supply, connected to the management and control board;

[0016] The auxiliary power supply is used to provide auxiliary power to the management control board.

[0017] In a further embodiment, the contactor includes:

[0018] Main positive contactor and main negative contactor;

[0019] The main positive contactor is connected to the DC power supply and the energy storage battery respectively, and the main negative contactor is connected to the DC power supply and the energy storage battery respectively.

[0020] In a further embodiment, the main positive contactor is connected to both a DC power supply and an energy storage battery, and the main negative contactor is also connected to both a DC power supply and an energy storage battery, including:

[0021] The first and second terminals of the main positive contactor are connected to the positive terminal of the DC power supply and the positive terminal of the energy storage battery, respectively. The first and second terminals of the main negative contactor are connected to the negative terminal of the DC power supply and the negative terminal of the energy storage battery, respectively.

[0022] In a further embodiment, the relay includes:

[0023] The main contact is connected to the management control board at both ends.

[0024] In a further embodiment, the relay includes auxiliary contacts, and the relay is respectively connected to the contactor, the energy storage battery, and the management control board, including:

[0025] The first terminal of the main positive contactor is connected to the first terminal of the auxiliary contact along with the positive terminal of the energy storage battery. The second terminal of the auxiliary contact is connected to the positive input terminal of the DC / DC converter. The first terminal of the main negative contactor is connected to the negative input terminal of the DC / DC converter along with the negative terminal of the energy storage battery. The positive and negative output terminals of the DC / DC converter are respectively connected to the positive and negative input terminals of the management control board.

[0026] In a further embodiment, the DC power supply includes AC mains power.

[0027] In a further embodiment, the energy storage battery includes one or more individual battery cells.

[0028] Furthermore, this utility model also provides an energy storage system, comprising:

[0029] DC power supply, management control board and energy storage power supply circuit of any of the foregoing embodiments;

[0030] The energy storage power supply circuit is connected to the DC power supply and the management control board respectively.

[0031] This utility model provides an energy storage power supply circuit and energy storage system, which, compared with the prior art, have the following advantages:

[0032] This invention incorporates a relay between the energy storage battery and the management control board. The management control board can control the relay to close via a power-on command, forming a power supply circuit between the energy storage battery, the relay, and the management control board. This ensures uninterrupted power supply to the management control board even after a system power outage. Furthermore, the management control board can also control the relay to open via a power-off command, cutting off the power supply circuit and preventing the energy storage battery from being over-discharged due to prolonged periods of low power. Attached Figure Description

[0033] Figure 1 This is a schematic block diagram of the energy storage power supply circuit provided in this embodiment of the utility model;

[0034] Figure 2 This is another principle block diagram of the energy storage power supply circuit provided in this embodiment of the utility model;

[0035] Figure 3 This is a structural block diagram of the energy storage power supply circuit provided in this embodiment of the utility model;

[0036] Figure 4 This is a structural block diagram of the energy storage system provided in this embodiment of the utility model;

[0037] Figure 5 This is a logic diagram of the power-on management of the management main control board provided in this embodiment of the utility model;

[0038] Figure 6 This is a logic diagram of the power-down management of the management main control board provided in this embodiment of the utility model.

[0039] Explanation of reference numerals in the attached figures:

[0040] Energy storage battery 1, contactor 2, main positive contactor 21, main negative contactor 22, relay 3, main contact K1, auxiliary contact K0, DC / DC converter 4, auxiliary power supply 5, energy storage power supply circuit 100, DC power supply 200, positive terminal DC+ of DC power supply 200, negative terminal DC- of DC power supply 200, and management control board 300. Detailed Implementation

[0041] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] Figure 1 This is a schematic block diagram of the energy storage power supply circuit 100 provided in this embodiment of the utility model, as follows: Figure 1 As shown, the energy storage power supply circuit 100 includes: an energy storage battery 1, a contactor 2, and a relay 3.

[0043] Contactor 2 is connected to DC power supply 200 and energy storage battery 1 respectively, and relay 3 is connected to contactor 2, energy storage battery 1 and management control board 300 respectively; contactor 2 and management control board 300 are communicatively connected. Specifically, contactor 2 and management control board 300 can be connected via wired or wireless communication.

[0044] The management control board 300 is used to control the contactor 2 to close according to the power-on command, so that the DC power supply 200, the contactor 2 and the energy storage battery 1 form a charging and discharging circuit; and to control the relay 3 to close, so that the energy storage battery 1, the relay 3 and the management control board 300 form a power supply circuit.

[0045] The management control board 300 is also used to control the contactor 2 to disconnect according to the power-down command, so as to cut off the charging and discharging circuit; and to control the relay 3 to disconnect to cut off the power supply circuit.

[0046] The Management Control Board 300 (MMCB) is a circuit board in an energy storage system that contains a dedicated microcontroller for remote monitoring, information acquisition, information processing, fault diagnosis, and logic judgment.

[0047] Upon receiving a power-on command, the management control board 300 controls the contactor 2 to close, forming a charging and discharging circuit between the DC power supply 200, contactor 2, and energy storage battery 1. Specifically, the DC power supply 200 charges and discharges the energy storage battery 1 through the contactor 2. Furthermore, the management control board 300 controls the relay 3 to close, forming a power supply circuit between the energy storage battery 1, relay 3, and management control board 300. This allows the energy storage battery 1 to supply power to the management control board 300 without interruption after a system power outage.

[0048] In addition, after receiving a power-down command, the management control board 300 controls the contactor 2 to disconnect, cutting off the charging and discharging circuit formed by the DC power supply 200, contactor 2, and energy storage battery 1. Furthermore, the management control board 300 controls the relay 3 to disconnect, thus cutting off the power supply circuit formed by the energy storage battery 1, relay 3, and management control board 300, preventing the energy storage battery 1 from being over-discharged for an extended period.

[0049] In a further embodiment, the DC power supply 200 includes AC mains power. The energy storage battery 1 includes one or more individual battery cells.

[0050] Figure 2 This is a schematic block diagram of the energy storage power supply circuit 100 provided in this embodiment of the utility model, as follows: Figure 2 As shown, the energy storage power supply circuit 100 also includes:

[0051] DC / DC converter 4 is connected to energy storage battery 1, relay 3 and management control board 300 respectively.

[0052] The DC / DC converter 4 is used to convert the DC power from the energy storage battery 1 to power the management control board 300. Specifically, the DC / DC converter 4 converts the DC power output from the energy storage battery 1 into the DC power required to power the management control board 300.

[0053] In a further embodiment, such as Figure 2 As shown, the energy storage power supply circuit 100 also includes:

[0054] Auxiliary power supply 5, which is connected to management control board 300.

[0055] The auxiliary power supply 5 is used to provide auxiliary power to the management control board 300. Specifically, the auxiliary power supply 5 assists the energy storage battery 1 in supplying power to the management control board 300.

[0056] Figure 3 This is a structural block diagram of the energy storage power supply circuit 100 provided in an embodiment of this utility model. (See diagram below.) Figure 3 As shown, contactor 2 includes:

[0057] Main positive contactor 21 and main negative contactor 22.

[0058] The main positive contactor 21 is connected to the DC power supply 200 and the energy storage battery 1, respectively, and the main negative contactor 22 is connected to the DC power supply 200 and the energy storage battery 1, respectively.

[0059] The main positive contactor 21 and / or the main negative contactor 22 are widely used switching devices used to control the on / off state of the charging and discharging circuit.

[0060] In a further embodiment, such as Figure 3 As shown, the main positive contactor 21 is connected to the DC power supply 200 and the energy storage battery 1, respectively, and the main negative contactor 22 is connected to the DC power supply 200 and the energy storage battery 1, including:

[0061] The first and second terminals of the main positive contactor 21 are respectively connected to the positive terminal DC+ of the DC power supply 200 and the positive terminal + of the energy storage battery 1, and the first and second terminals of the main negative contactor 22 are respectively connected to the negative terminal DC- of the DC power supply 200 and the negative terminal - of the energy storage battery 1.

[0062] In a further embodiment, such as Figure 3 As shown, relay 3 includes:

[0063] Main contact K1, with its two ends connected to management control board 300.

[0064] In a further embodiment, such as Figure 3 As shown, relay 3 includes auxiliary contact K0. Relay 3 is connected to contactor 2, energy storage battery 1, and management control board 300, and includes:

[0065] The first terminal of the main positive contactor 21 is connected to the first terminal of the auxiliary contact K0 along with the positive terminal + of the energy storage battery 1. The second terminal of the auxiliary contact K0 is connected to the positive terminal + of the input terminal of the DC / DC converter 4. The first terminal of the main negative contactor 22 is connected to the negative terminal - of the input terminal of the DC / DC converter 4 along with the negative terminal - of the energy storage battery 1. The positive terminal and the negative terminal of the output terminal of the DC / DC converter 4 are respectively connected to the positive terminal + and the negative terminal - of the input terminal of the management control board 300.

[0066] Figure 4 This is a structural block diagram of the energy storage system provided in this embodiment of the utility model, as shown below. Figure 4 As shown, the energy storage system includes: a DC power supply 200, a management control board 300, and an energy storage power supply circuit 100.

[0067] The energy storage power supply circuit 100 is connected to the DC power supply 200 and the management control board 300 respectively.

[0068] This invention establishes a relay 3 between the energy storage battery 1 and the management control board 300 in the energy storage power supply circuit 100. The management control board 300 can control the relay 3 to close via a power-on command, forming a power supply circuit between the energy storage battery 1, the relay 3, and the management control board 300. This ensures uninterrupted power supply from the energy storage battery 1 to the management control board 300 even after a system power outage. Furthermore, the management control board 300 can also control the relay 3 to open via a power-off command to disconnect the power supply circuit, preventing the energy storage battery 1 from being over-discharged due to prolonged power loss.

[0069] Figure 5 This is a logic diagram of the power-on management of the management main control board provided in this embodiment of the utility model. For example... Figure 5 As shown, during normal power-on, the auxiliary power supply 5 supplies power to the management control board 300, enabling the management control board 300 to start. After the management control board 300 performs a self-test without any abnormalities, it controls the main positive contactor 21 and the main negative contactor 22 to close. When the management control board 300 detects that the voltage of a single cell of the energy storage battery 1 is greater than 2.5V, it controls the main contact K1 and the auxiliary contact K0 of the relay 3 to close, so that the DC power supply 200, the contactor 2 and the energy storage battery 1 form a charging and discharging circuit, and the entire energy storage system enters the charging and discharging state. At the same time, the entire energy storage system is powered on.

[0070] Figure 6 This is a logic diagram of the power-on management of the management main control board provided in this embodiment of the utility model. For example... Figure 6 As shown, the energy storage system shuts down entirely. When the management control board 300 detects that the main circuit power supply is less than 20A, it disconnects the main positive contactor 21 and the main negative contactor 22. Then, the management control board 300 supplies power through the auxiliary power supply 5 to control the main contact K1 and auxiliary contact K0 of the relay 3 to disconnect, causing the energy storage battery 1 to stop supplying power to the management control board 300. At this time, the management control board 300 loses power, and the entire energy storage system is powered down. Alternatively, after the management control board 300 disconnects the main positive contactor 21 and the main negative contactor 22, when the management control board 300 detects that the voltage of a single cell is less than 2.5V, it will disconnect the main contact K1 and auxiliary contact K0 of the relay 3, causing the management control board 300 to lose power, and the entire energy storage system to power down.

[0071] In summary, the energy storage power supply circuit 100 and energy storage system provided by this utility model, by setting a relay 3 between the energy storage battery 1 and the management control board 300, allows the management control board 300 to control the relay 3 to close via a power-on command, thus forming a power supply circuit between the energy storage battery 1, the relay 3, and the management control board 300. That is, the energy storage battery 1 supplies power to the management control board 300 through the relay 3, achieving uninterrupted power supply to the management control board 300 after a system power outage. Furthermore, the management control board 300 can also control the relay 3 to open via a power-off command to cut off the power supply circuit, preventing the energy storage battery 1 from being over-discharged due to prolonged power loss.

[0072] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. An energy storage power supply circuit, characterized in that, The energy storage power supply circuit, connected to both a DC power supply and a management control board, includes: Energy storage batteries, contactors, and relays; The contactor is connected to the DC power supply and the energy storage battery respectively, and the relay is connected to the contactor, the energy storage battery and the management control board respectively; the contactor is communicatively connected to the management control board; The management control board is used to control the contactor to close according to the power-on command, so that the DC power supply, the contactor and the energy storage battery form a charging and discharging circuit; and to control the relay to close, so that the energy storage battery and the relay and the management control board form a power supply circuit; The management control board is also used to control the contactor to disconnect according to the power-down command, so as to cut off the charging and discharging circuit; and to control the relay to disconnect to cut off the power supply circuit.

2. The energy storage power supply circuit as described in claim 1, characterized in that, The energy storage power supply circuit also includes: A DC / DC converter, wherein the DC / DC converter is respectively connected to the energy storage battery, the relay and the management control board; The DC / DC converter is used to convert the DC power from the energy storage battery to power the management control board.

3. The energy storage power supply circuit as described in claim 1, characterized in that, The energy storage power supply circuit also includes: An auxiliary power supply, which is connected to the management and control board; The auxiliary power supply is used to provide auxiliary power to the management control board.

4. The energy storage power supply circuit as described in claim 2, characterized in that, The contactor includes: Main positive contactor and main negative contactor; The main positive contactor is connected to the DC power supply and the energy storage battery, respectively, and the main negative contactor is connected to the DC power supply and the energy storage battery, respectively.

5. The energy storage power supply circuit as described in claim 4, characterized in that, The main positive contactor is connected to the DC power supply and the energy storage battery respectively, and the main negative contactor is connected to the DC power supply and the energy storage battery respectively, including: The first and second terminals of the main positive contactor are respectively connected to the positive terminal of the DC power supply and the positive terminal of the energy storage battery, and the first and second terminals of the main negative contactor are respectively connected to the negative terminal of the DC power supply and the negative terminal of the energy storage battery.

6. The energy storage power supply circuit as described in claim 5, characterized in that, The relay includes: The main contact is connected to the management control board at both ends.

7. The energy storage power supply circuit as described in claim 5, characterized in that, The relay includes auxiliary contacts and is connected to the contactor, the energy storage battery, and the management control board, respectively. The first end of the main positive contactor and the positive terminal of the energy storage battery are connected to the first end of the auxiliary contact, and the second end of the auxiliary contact is connected to the positive input terminal of the DC / DC converter; the first end of the main negative contactor and the negative terminal of the energy storage battery are connected to the negative input terminal of the DC / DC converter; the positive and negative output terminals of the DC / DC converter are respectively connected to the positive and negative input terminals of the management control board.

8. The energy storage power supply circuit as described in claim 1, characterized in that, The DC power supply includes AC mains power.

9. The energy storage power supply circuit as described in claim 1, characterized in that, The energy storage battery includes one or more individual battery cells.

10. An energy storage system, characterized in that, The energy storage system includes: a DC power supply, a management control board, and an energy storage power supply circuit as described in any one of claims 1-9; The energy storage power supply circuit is connected to the DC power supply and the management control board, respectively.

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