Power switching circuit and energy storage system

Abstract

The utility model discloses a power supply switching circuit and an energy storage system. The power supply switching circuit comprises a first power supply input end, a second power supply input end, an output end, a control sub-circuit and a storage battery unit, the first power input end is electrically connected with the high-voltage direct-current power supply assembly; the second power input end is electrically connected with the high-voltage alternating-current power supply assembly; the output end is electrically connected with the load assembly; the control sub-circuit is electrically connected with the first power input end, the second power input end, the output end and the storage battery unit and used for controlling the high-voltage alternating-current power supply assembly to supply power to the load assembly, or the storage battery unit to supply power to the load assembly, or the high-voltage direct-current power supply assembly to supply power to the load assembly. According to the technical scheme provided by the utility model, the power supply switching circuit can reliably supply power to the high-voltage cabinet, so that the stable operation of the whole system is ensured.

Description

Technical Field

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

[0002] Energy storage power stations typically employ multi-cluster battery configurations within energy storage containers, utilizing multiple high-voltage storage cabinets. These high-voltage cabinets, acting as secondary battery management units, are generally powered by an external AC power source for their control circuits. However, this external AC power supply is unreliable, susceptible to issues such as power outages or short circuits. A power outage can cause the internal secondary battery management units and circuit breakers within the high-voltage cabinet to malfunction, potentially leading to battery clusters losing protection, resulting in charging / discharging failures, or preventing continuous system operation and impacting system stability. Utility Model Content

[0003] This invention provides a power switching circuit and an energy storage system, enabling the power switching circuit to reliably supply power to the high-voltage switchgear, thereby ensuring the stable operation of the entire system.

[0004] In a first aspect, the present invention provides a power switching circuit, including: a first power input terminal, a second power input terminal, an output terminal, a control sub-circuit, and a battery unit;

[0005] The first power input terminal is electrically connected to the high-voltage DC power supply component;

[0006] The second power input terminal is electrically connected to the high-voltage AC power supply component;

[0007] The output terminal is electrically connected to the load component;

[0008] The control sub-circuit is electrically connected to the first power input terminal, the second power input terminal, the output terminal, and the battery unit, respectively, and is used to control the high-voltage AC power supply component to supply power to the load component, or the battery unit to supply power to the load component, or the high-voltage DC power supply component to supply power to the load component.

[0009] Optionally, the control sub-circuit includes a first voltage conversion circuit, a second voltage conversion circuit, a third voltage conversion circuit, a first switching assembly, a second switching assembly, and a third switching assembly;

[0010] The first power input terminal is electrically connected to the second voltage conversion circuit in sequence through the first voltage conversion circuit and the first switching assembly;

[0011] The second power input terminal is electrically connected to the battery unit through the third voltage conversion circuit, the second voltage conversion circuit, and the second switching assembly;

[0012] The third switch assembly includes a first terminal, a second terminal, and a third terminal. The first terminal is electrically connected to the second voltage conversion circuit, the second terminal is electrically connected to the third voltage conversion circuit, and the third terminal is electrically connected to the output terminal of the power switching circuit.

[0013] The first switching assembly is used to turn on when both the high-voltage AC power supply assembly and the battery unit are abnormally powered, so that the high-voltage DC power supply assembly can supply power to the load assembly.

[0014] The second switching assembly is used to turn on when the high-voltage AC power supply assembly is in normal power supply so that the high-voltage AC power supply assembly charges the battery unit, and to turn on when the high-voltage AC power supply assembly is in abnormal power supply so that the battery unit discharges to supply power to the load assembly.

[0015] The third switch assembly is used to connect the second terminal and the third terminal when the high-voltage AC power supply assembly is supplying power normally, so that the high-voltage AC power supply assembly supplies power to the load assembly; and to connect the first terminal and the third terminal when the high-voltage AC power supply assembly is supplying power abnormally, so that the battery unit or the high-voltage DC power supply assembly supplies power to the load assembly.

[0016] Optionally, the first voltage conversion circuit is a step-down circuit;

[0017] The second voltage conversion circuit is a step-up / step-down bidirectional converter circuit;

[0018] The third voltage conversion circuit is an AC-DC conversion circuit.

[0019] Optionally, the charging and discharging voltage of the battery unit is lower than the power supply voltage of the load component.

[0020] Optionally, the high-voltage DC power supply assembly includes a battery cell.

[0021] Secondly, this utility model provides an energy storage system, including a high-voltage control cabinet and a power switching circuit as described in the first aspect.

[0022] The load component of the power switching circuit is the high-voltage control cabinet, and the power switching circuit is used to provide control power to the high-voltage control cabinet.

[0023] Optionally, the energy storage system may further include energy storage devices;

[0024] The battery unit on the DC side of the energy storage device is the high-voltage DC power supply component.

[0025] Optionally, the high-voltage control cabinet may also include indicator lights;

[0026] The indicator light is used to emit different colors of light when the high-voltage AC power supply component, the high-voltage DC power supply component, or the battery unit supplies power to the high-voltage control cabinet in the power switching circuit.

[0027] Optionally, the energy storage also includes a button for manually controlling the connection or disconnection of the power supply path from the battery unit to the high-voltage control cabinet.

[0028] The solution provided by this utility model can control the connection or disconnection of the power supply path between the first power input terminal and the load component, the connection or disconnection of the power supply path between the second power input terminal and the load component, and the connection or disconnection of the power supply path between the battery unit and the load component through the control sub-circuit. In different situations, the high-voltage AC power supply component, the battery unit, or the high-voltage DC power supply component can be selectively controlled to supply power to the load component, according to the actual specific situation, to ensure the normal operation of the load component and improve the stability and safety of the entire circuit.

[0029] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, although the drawings described below are some specific embodiments of this utility model, those skilled in the art can extend and extend to other structures and drawings based on the basic concepts of the device structure, driving method and manufacturing method disclosed and indicated by the various embodiments of this utility model. Undoubtedly, these should all be within the scope of the claims of this utility model.

[0031] Figure 1 A schematic diagram of a power switching circuit provided in an embodiment of this utility model;

[0032] Figure 2 A schematic diagram of another power switching circuit provided in an embodiment of this utility model;

[0033] Figure 3 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the basic concepts disclosed and indicated in the embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the protection scope of this utility model.

[0035] Figure 1 A schematic diagram of a power switching circuit provided in an embodiment of this utility model is shown below. Figure 1 As shown, the power switching circuit 1 includes: a first power input terminal X1, a second power input terminal X2, an output terminal Y, a control sub-circuit 11, and a battery unit 12; the first power input terminal X1 is electrically connected to the high-voltage DC power supply component 2; the second power input terminal X2 is electrically connected to the high-voltage AC power supply component 3; the output terminal Y is electrically connected to the load component 4; the control sub-circuit 11 is electrically connected to the first power input terminal X1, the second power input terminal X2, the output terminal Y, and the battery unit 12, respectively, and is used to control the high-voltage AC power supply component 3 to supply power to the load component 4, or the battery unit 12 to supply power to the load component 4, or the high-voltage DC power supply component 2 to supply power to the load component 4.

[0036] The specific value of the power supply voltage of the high-voltage DC power supply component 2 can be set according to the actual situation, and no specific limit is made here. For example, the power supply voltage of the high-voltage DC power supply component 2 is 1500V.

[0037] The specific value of the power supply voltage of the high-voltage AC power supply component 3 can be set according to the actual situation, and no specific limit is made here. For example, the power supply voltage of the high-voltage AC power supply component 3 is 220V.

[0038] In this embodiment, the control sub-circuit 11 can control the connection or disconnection of the power supply path between the first power input terminal X1 and the load component 4, the connection or disconnection of the power supply path between the second power input terminal X2 and the load component 4, and the connection or disconnection of the power supply path between the battery unit 12 and the load component 4. In different situations, it can selectively control the high-voltage AC power supply component 3 to supply power to the load component 4, or the battery unit 12 to supply power to the load component 4, or the high-voltage DC power supply component 2 to supply power to the load component 4, ensuring the normal operation of the components. It should be noted that the high-voltage AC power supply component 3, the high-voltage DC power supply component, and the battery unit 12 cannot supply power to the load component 4 simultaneously to avoid affecting the stability and safety of the entire circuit.

[0039] Optional, continue to refer to Figure 1The control sub-circuit 11 can also control the high-voltage AC power supply component 3 to supply power to the load component 4, and at the same time charge the battery unit 12.

[0040] Optional, continue to refer to Figure 1 The high-voltage DC power supply component 2 includes a battery unit, wherein the battery unit can be a battery pack structure consisting of at least one set of batteries.

[0041] Optional, Figure 2 A schematic diagram of another power switching circuit provided in an embodiment of this utility model is shown below. Figure 2 As shown, the control sub-circuit 11 includes a first voltage conversion circuit 111, a second voltage conversion circuit 112, a third voltage conversion circuit 113, a first switching assembly 114, a second switching assembly 115, and a third switching assembly 116. The first power input terminal X1 is electrically connected to the second voltage conversion circuit 112 via the first voltage conversion circuit 111 and the first switching assembly 114. The second power input terminal X2 is electrically connected to the battery unit 12 via the third voltage conversion circuit 113, the second voltage conversion circuit 112, and the second switching assembly 115. The third switching assembly 116 includes a first terminal a, a second terminal b, and a third terminal c. The first terminal a is electrically connected to the second voltage conversion circuit 112, the second terminal b is electrically connected to the third voltage conversion circuit 113, and the third terminal c is connected to the output terminal of the power switching circuit 1. Y-connection; the first switch assembly 114 is used to turn on when both the high-voltage AC power supply assembly 3 and the battery unit 12 are abnormally powered, so that the high-voltage DC power supply assembly 2 supplies power to the load assembly 4; the second switch assembly 115 is used to turn on when the high-voltage AC power supply assembly 3 is normally powered, so that the high-voltage AC power supply assembly 3 charges the battery unit 12, and turns on when the high-voltage AC power supply assembly 3 is abnormally powered, so that the battery unit 12 discharges to supply power to the load assembly 4; the third switch assembly 116 is used to turn on the second terminal b and the third terminal c when the high-voltage AC power supply assembly 3 is normally powered, so that the high-voltage AC power supply assembly 3 supplies power to the load assembly 4, and turns on the first terminal a and the third terminal c when the high-voltage AC power supply assembly 3 is abnormally powered, so that either the battery unit 12 or the high-voltage DC power supply assembly 2 supplies power to the load assembly 4.

[0042] The first switch assembly 114 and the second switch assembly 115 can be either a circuit breaker or a relay, without specific limitations here.

[0043] The third switch assembly 116 can be a selector switch.

[0044] Specifically, when the high-voltage AC power supply component 3 is supplying power normally, the first switch component 114 is open, the second switch component 115 is open, and the second terminal b and the third terminal c of the third switch component 116 are open. This allows the high-voltage AC power supply component 3 to convert the AC voltage into the first DC voltage through the third voltage conversion circuit 113, and then supply it to the load component 4 through the third switch component 116 to power the load component 4. At the same time, the first DC voltage can also be converted into the second DC voltage through the second voltage conversion circuit 112, and then supplied to the battery unit 12 through the open second switch component 115 to charge the battery unit 12. When the high-voltage AC power supply component 3 experiences a power supply malfunction, the first switch component 114 is disconnected, the second switch component 115 is turned on, and the first terminal a and the third terminal c of the third switch component 116 are turned on, causing the battery unit 12 to discharge. The DC voltage (i.e., the second DC voltage) is supplied to the second voltage conversion circuit 112 through the second switch component 115. The second voltage conversion circuit 112 then converts the second DC voltage back into the first DC voltage and supplies it to the load component 4 through the third switch component 116, thus powering the load component 4. When both the high-voltage AC power supply component 3 and the battery unit 12 experience power supply failure, the first switching component 114 is turned on, the second switching component 115 is turned off, and the first terminal a and the third terminal c of the third switching component 1116 are turned on. This allows the third DC voltage provided by the high-voltage DC power supply component 2 to be supplied to the first voltage conversion circuit 111. The first voltage conversion circuit 111 converts the third DC voltage into a fourth DC voltage, which is then supplied to the second voltage conversion circuit 115 via the turned-on second switching component 114. The second voltage conversion circuit then converts the fourth DC voltage back into a first DC voltage, which is then supplied to the load component 4 via the third switching component 116, thus powering the load component 4. In this way, the power switching circuit 1 can reliably supply power to the load component 4 under different operating conditions, ensuring the normal operation of the load component 4.

[0045] Optional, continue to refer to Figure 2 The first voltage conversion circuit 111 is a step-down circuit; the second voltage conversion circuit 112 is a step-up / step-down bidirectional conversion circuit; and the third voltage conversion circuit 113 is an AC / DC conversion circuit.

[0046] Specifically, the DC voltage provided by the high-voltage DC power supply component 2 is relatively high, exceeding the normal supply voltage (i.e., the first DC voltage) of the load component 4. Therefore, the first voltage conversion circuit 114 can be configured as a step-down circuit. The first voltage conversion circuit converts the provided third DC voltage into a fourth DC voltage. The fourth DC voltage can be any value greater than or less than the supply voltage of the load component 4; no specific limitation is made here. Since the second voltage conversion circuit 112 is a bidirectional step-up / step-down converter, regardless of whether the fourth DC voltage is greater than the first DC voltage, it can be converted into the first DC voltage through the second voltage conversion circuit and provided to the load component 4.

[0047] Furthermore, the third voltage conversion circuit 113 is an AC-DC conversion circuit, which can convert the AC voltage provided by the high-voltage AC power supply component 3 into a first DC voltage and provide it to the load component 4 for power supply.

[0048] The charging piezoelectric voltage and discharging voltage of the battery unit 12 are both the second DC voltage. If the first DC voltage and the second DC voltage are different, they can be converted by the second voltage conversion circuit 112.

[0049] Optionally, the charging and discharging voltage of the battery unit 12 is less than the supply voltage of the load component 4, that is, the first DC voltage is greater than the second DC voltage. Thus, when the battery unit is charging, the second voltage conversion circuit 112 operates as a step-down circuit, converting the first DC voltage to the second DC voltage. When the battery unit 12 is discharging, the second voltage conversion circuit 112 operates as a step-up / step-down circuit, converting the second DC voltage back to the first DC voltage.

[0050] Optionally, the specific values ​​of the first, second, third, and fourth DC voltages can be set according to actual conditions, and are not specifically limited here. For example, the first DC voltage can be 24V, the second DC voltage can be 12V, the third DC voltage can be 1500V, and the fourth DC voltage can be any value greater than 24V and less than 1500V.

[0051] Based on the same inventive concept, this utility model embodiment also provides a structural schematic diagram of an energy storage system. Figure 3 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present utility model, combined with... Figure 1 and Figure 3 As shown, the energy storage system includes a high-voltage control cabinet 01 and a power switching circuit 1 provided in any of the above embodiments; the load component of the power switching circuit 1 is the high-voltage control cabinet 01, and the power switching circuit 1 is used to provide control power to the high-voltage control cabinet 01.

[0052] Among them, the high-voltage control cabinet 01 is the battery management unit of the energy storage system. Once the control power of the high-voltage control cabinet 01 is abnormal, it will cause the high-voltage control cabinet 01 to fail to work properly, thereby affecting the reliable operation of the energy storage system.

[0053] Optional, continue to refer to Figure 1 and Figure 3 The energy storage system also includes an energy storage device 02; the battery unit 021 on the DC side of the energy storage device 02 is a high-voltage DC power supply component.

[0054] Specifically, the energy storage device 02 includes an energy storage converter structure, with a battery unit on its DC side. By electrically connecting the battery unit to the first power input terminal X1 of the power switching circuit 1, when neither the high-voltage AC power supply component 3 nor the battery unit 12 in the power switching circuit 1 can normally provide control power to the high-voltage control cabinet 01, the battery unit 02 on the DC side of the energy storage device 02 can discharge to provide control power to the high-voltage control cabinet 01, ensuring the normal operation of the high-voltage control cabinet 01 and thus ensuring the stable operation of the energy storage system.

[0055] Optional, continue to refer to Figure 3 The high-voltage control cabinet 01 also includes indicator lights 011; the indicator lights 011 are used to emit different colors of light when the high-voltage AC power supply component 3, the high-voltage DC power supply component 2 or the battery unit 12 in the power switching circuit 1 supply power to the high-voltage control cabinet 01.

[0056] Specifically, indicator light 011 can emit different colors of light, and when the high-voltage AC power supply component 3, the high-voltage DC power supply component 2, and the battery unit 12 supply power to the high-voltage control cabinet 01 respectively, the indicator light displays different colors of light, making it easier for operators to determine which of the high-voltage AC power supply component 3, the high-voltage DC power supply component 2, and the battery unit 12 is supplying power to the high-voltage control cabinet 01 based on the current color of light emitted by indicator light 011.

[0057] Optionally, the high-voltage control cabinet 01 may also include a charging indicator and a discharging indicator for the battery unit 12. When the charging indicator is lit, it indicates that the battery unit 12 is charging, and when the discharging indicator is lit, it indicates that the battery unit 12 is discharging.

[0058] Optional, continue to refer to Figure 3 The energy storage system also includes a button 03, which is used to manually control the power supply path of the battery unit 12 to the high-voltage control cabinet 01 to be turned on or off.

[0059] Specifically, button 03 can be electrically connected to control sub-circuit 11, allowing the operator to manually control the connection or disconnection of the power supply path between battery unit 12 and high-voltage control cabinet 01. For example, if battery unit 12 supplies power to high-voltage control cabinet 01, when the energy storage system stops working, it is necessary to disconnect the power supply path between battery unit 12 and high-voltage control cabinet 01 to prevent battery unit 12 from continuously discharging and wasting electrical energy.

[0060] Furthermore, in conjunction with references Figure 2 and Figure 3 The control sub-circuit 11 may include a switching assembly (i.e., a switch assembly disposed between the battery unit 12 and the high-voltage control cabinet 01) Figure 2 The second switch assembly in the middle), button 01 can be electrically connected to the switch assembly, that is, the switch assembly can be turned on or off by pressing button 03.

[0061] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power switching circuit, characterized by, include: First power input terminal, second power input terminal, output terminal, control sub-circuit and battery unit; The first power input terminal is electrically connected to the high-voltage DC power supply component; The second power input terminal is electrically connected to the high-voltage AC power supply component; The output terminal is electrically connected to the load component; The control sub-circuit is electrically connected to the first power input terminal, the second power input terminal, the output terminal, and the battery unit, respectively, and is used to control the high-voltage AC power supply component to supply power to the load component, or the battery unit to supply power to the load component, or the high-voltage DC power supply component to supply power to the load component.

2. The power switching circuit of claim 1, wherein, The control sub-circuit includes a first voltage conversion circuit, a second voltage conversion circuit, a third voltage conversion circuit, a first switching assembly, a second switching assembly, and a third switching assembly; The first power input terminal is electrically connected to the second voltage conversion circuit in sequence through the first voltage conversion circuit and the first switching assembly; The second power input terminal is electrically connected to the battery unit through the third voltage conversion circuit, the second voltage conversion circuit, and the second switching assembly; The third switch assembly includes a first terminal, a second terminal, and a third terminal. The first terminal is electrically connected to the second voltage conversion circuit, the second terminal is electrically connected to the third voltage conversion circuit, and the third terminal is electrically connected to the output terminal of the power switching circuit. The first switching assembly is used to turn on when both the high-voltage AC power supply assembly and the battery unit are abnormally powered, so that the high-voltage DC power supply assembly can supply power to the load assembly. The second switching assembly is used to turn on when the high-voltage AC power supply assembly is powered normally, so that the high-voltage AC power supply assembly charges the battery unit, and to turn on when the high-voltage AC power supply assembly is powered abnormally, so that the battery unit discharges to power the load assembly. The third switch assembly is used to connect the second terminal and the third terminal when the high-voltage AC power supply assembly is supplying power normally, so that the high-voltage AC power supply assembly supplies power to the load assembly; and to connect the first terminal and the third terminal when the high-voltage AC power supply assembly is supplying power abnormally, so that the battery unit or the high-voltage DC power supply assembly supplies power to the load assembly.

3. The power switching circuit of claim 2, wherein, The first voltage conversion circuit is a step-down circuit; The second voltage conversion circuit is a step-up / step-down bidirectional converter circuit; The third voltage conversion circuit is an AC-DC conversion circuit.

4. The power switching circuit of claim 3, wherein, The charging and discharging voltage of the battery unit is lower than the power supply voltage of the load component.

5. The power switching circuit of claim 1, wherein, The high-voltage DC power supply component includes a battery unit.

6. An energy storage system characterized by, Includes a high-voltage control cabinet and a power switching circuit as described in any one of claims 1-5; The load component of the power switching circuit is the high-voltage control cabinet, and the power switching circuit is used to provide control power to the high-voltage control cabinet.

7. The energy storage system of claim 6, wherein, The energy storage system also includes energy storage devices; The battery unit on the DC side of the energy storage device is the high-voltage DC power supply component.

8. The energy storage system of claim 6, wherein, The high-voltage control cabinet also includes indicator lights; The indicator light is used to emit different colors of light when the high-voltage AC power supply component, the high-voltage DC power supply component, or the battery unit supplies power to the high-voltage control cabinet in the power switching circuit.

9. The energy storage system of claim 6, wherein, The energy storage system also includes a button for manually controlling the connection or disconnection of the power supply path from the battery unit to the high-voltage control cabinet.

Images