Energy storage integrated cabinet

Abstract

The utility model relates to energy storage cabinet technical field especially relates to a kind of energy storage integrated cabinet, comprising: cabinet and the main power supply circuit, standby power supply circuit, DC bus, relay being set in cabinet.It includes switching power supply and diode in main power supply circuit, and the output of switching power supply is connected to DC bus by diode, and it is powered for load.Standby power supply circuit includes PCS, energy storage battery and DC / DC converter, and DC / DC is used to convert high-voltage DC power provided by energy storage battery into second DC power;The normally closed contact of relay is connected between DC / DC converter and DC bus;Normally open contact is vacant;When switching power supply is powered off, the normally closed contact of relay is closed, and standby power supply circuit is powered for load.The utility model has the advantages that DC / DC converter is used to replace AC / DC rectification and inverter link in traditional UPS, and the efficiency of electric energy conversion is improved, and system service life is extended, and the design goal of compact structure and low cost is simultaneously realized.

Description

Technical Field

[0001] This utility model relates to the field of energy storage cabinet technology, and in particular to an integrated energy storage cabinet. Background Technology

[0002] Battery Management System (BMS), Energy Management System (EMS), and fire protection control systems in commercial and industrial energy storage cabinets typically use 24V DC power. This 24V DC power supply mainly comes from two sources: one is through a 220V AC bus converted to 24V DC via a switching power supply; the other is provided by the system's backup power supply.

[0003] Currently, commercial and industrial energy storage cabinets generally use UPS (Uninterruptible Power Supply) as backup power. Its working principle is as follows: external 220V AC power is input to the UPS, rectified by AC / DC to 48V DC, and then used to charge the internal battery; during discharge, the UPS inverts the 48V DC output from the battery back to 220V AC output, which is then converted to 24V DC by an external AC / DC switching power supply for use by EMS, BMS, and other systems.

[0004] However, the above UPS solution has the following obvious drawbacks:

[0005] Low efficiency: Electrical energy needs to undergo multiple stages of conversion, including AC / DC rectification, DC / AC inversion, and AC / DC rectification again. Combined with battery charging and discharging losses, the overall efficiency is usually below 85%.

[0006] Short lifespan: UPS relies on frequent charging and discharging of batteries, and currently most of them use lead-acid maintenance-free batteries, whose cycle life is only 3 to 4 years.

[0007] Large space occupation: The backup power capacity of a UPS is directly proportional to the volume of the battery, and the energy density of the battery is limited. Increasing the capacity will inevitably squeeze the already tight space inside the cabinet.

[0008] High cost: For a 1kWh capacity, a single UPS adds about 2,000 yuan to the cost of the energy storage cabinet. Utility Model Content

[0009] In view of this, the present invention aims to provide an integrated energy storage cabinet, comprising: a cabinet body and a main power supply circuit, a backup power supply circuit, a DC bus, and a relay disposed within the cabinet body; the main power supply circuit includes a switching power supply and a diode, the input terminal of the switching power supply is connected to the power supply bus, and the output terminal of the switching power supply is connected to the DC bus through the diode to supply power to the load; the switching power supply is used to convert the AC power of the power supply bus into a first DC power; the diode is used to prevent reverse current; the backup power supply circuit includes a PCS, an energy storage battery, and a DC / DC converter, the energy storage battery being connected to the power supply bus through the PCS. Connections: The input terminal of the DC / DC converter is electrically connected to the energy storage battery; the DC / DC converter is used to convert the high-voltage DC power provided by the energy storage battery into a second DC power; the relay coil is electrically connected to the output terminal of the switching power supply; the normally closed contact of the relay is connected between the DC / DC converter and the DC bus; the normally open contact of the relay is unused; when the switching power supply is working normally, the relay coil is energized, the normally open contact is closed, and the main power supply circuit supplies power to the load; when the switching power supply is de-energized, the relay coil is de-energized, the normally closed contact is closed, and the backup power supply circuit is connected to the DC bus to supply power to the load.

[0010] Furthermore, the load includes at least one of the following: battery management system (BMS), energy management system (EMS), fire control system, and communication and I / O system.

[0011] Furthermore, the switching power supply is an AC / DC switching power supply, which includes an AC terminal and a DC terminal. The input voltage of the AC terminal is 220V, and the output voltage of the DC terminal is 24V.

[0012] Furthermore, the input voltage of the DC / DC converter is 832V, and the output voltage of the DC / DC converter is 24V.

[0013] Furthermore, the energy storage battery is any one of ternary lithium batteries, lithium iron phosphate batteries, lithium titanate batteries, lithium manganese oxide batteries, or lead-acid batteries.

[0014] Furthermore, the power supply bus outputs 380V AC power.

[0015] Furthermore, the relay is a magnetic latching relay.

[0016] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0017] 1) High power efficiency: By eliminating the multiple AC / DC and DC / AC conversion stages in the UPS solution, energy loss is greatly reduced. The power efficiency of the DC / DC converter 22 is greater than 97%, which is much higher than the efficiency of UPS, which is usually less than 85%.

[0018] 2) Long service life: The DC / DC converter 22 is a purely electronic product, and there are no chemical losses or charge / discharge cycle life issues like those of batteries in UPS. Its service life can reach more than 10 years, far exceeding the average lifespan of 3 to 4 years for UPS batteries.

[0019] 3) Compact size: By eliminating the battery pack and complex multi-stage conversion circuit inside the UPS, the size of the DC / DC converter 22 is significantly reduced, making the overall size of the energy storage cabinet integrating this backup power solution only one-quarter of that of the UPS solution.

[0020] 4) Low cost: Similarly, because the dedicated UPS battery and corresponding management conversion circuit are eliminated, the material cost and manufacturing cost of the energy storage cabinet can be greatly reduced, and the overall cost is about one-fifth of that of the UPS solution. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of this invention. The illustrative embodiments and descriptions of this invention are used to explain this invention and do not constitute an undue limitation of this invention. In the drawings:

[0022] Figure 1 This is a structural schematic diagram of an integrated energy storage cabinet provided according to an embodiment of the present utility model.

[0023] The reference numerals in the attached diagram include: 1. Main power supply circuit; 11. Switching power supply; 12. Diode; 2. Backup power supply circuit; 21. Energy storage battery; 22. DC / DC converter; 3. DC bus; 4. Relay; 5. Load; 6. Power supply bus. Detailed Implementation

[0024] To make the purpose, technical solution, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and do not constitute a limitation thereof.

[0025] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 As shown in the figure, an energy storage integrated cabinet provided in this embodiment of the present invention includes: a cabinet body and a main power supply circuit 1, a backup power supply circuit 2, a DC bus 3, a relay 4, and a load 5 disposed within the cabinet body. The load 5 is connected to the DC bus 3.

[0030] The main power supply circuit 1 includes a switching power supply 11 and a diode 12. The switching power supply 11 converts AC power to a first DC power. The diode 12 prevents reverse current. The input terminal of the switching power supply 11 is connected to the power supply bus 6, and the output terminal of the switching power supply 11 is connected to the DC bus 3 through the diode 12 to supply power to the load 5. The output of the power supply bus 6 is 380V AC power. The main function of the diode 12 is to prevent current from flowing back into the switching power supply 11 through the DC bus 3 when the backup power supply circuit 2 is activated.

[0031] The backup power supply circuit 2 includes a PCS, an energy storage battery 21, and a DC / DC converter 22. The energy storage battery 21 is electrically connected to the power supply bus 6 via the PCS. The input terminal of the DC / DC converter 22 is electrically connected to the energy storage battery 21. The DC / DC converter 22 converts the high-voltage DC power provided by the energy storage battery 21 into a second DC power supply to power the load 5.

[0032] The coil of relay 4 is electrically connected to the output terminal of switching power supply 11. The normally closed contact of relay 4 is connected between DC / DC converter 22 and DC bus 3. The normally open contact of relay 4 is left unused.

[0033] Specifically, the switching power supply 11 is an AC / DC switching power supply with an AC input voltage of 220V and a DC output voltage of 24V.

[0034] The energy storage battery 21 is one of the following: ternary lithium battery, lithium iron phosphate battery, lithium titanate battery, lithium manganese oxide battery, or lead-acid battery.

[0035] The input voltage of DC / DC converter 22 is 832V, and the output voltage of DC / DC converter 22 is 24V.

[0036] The switching power supply 11 receives a rated AC input voltage of 220V and converts it into a stable 24V DC voltage (i.e., the first DC voltage) through a series of power conversion and processing units, including an internal rectifier bridge, power factor correction circuit, high-frequency transformer, and rectifier filter circuit. The first DC voltage is then supplied to the DC bus 3, which powers the load 5.

[0037] Backup power supply circuit 2 serves as a redundant backup for main power supply circuit 1, and its energy source is energy storage battery 21. This energy storage battery 21 is a high-voltage battery, and its normal operating voltage range is much higher than the 24V voltage required to control load 5.

[0038] During normal operation of the integrated energy storage cabinet, the energy storage battery 21 is electrically connected to the power supply bus 6 via the PCS (bidirectional converter). The core function of the PCS is to realize the bidirectional conversion between the battery's DC energy and the grid's AC energy, that is, to complete the charging and discharging process.

[0039] The core component of the backup power supply circuit 2 is the DC / DC converter 22. Its high-voltage input terminal is connected to the energy storage battery 21. When the main power supply circuit 1 fails, the high-voltage DC power supplied by the energy storage battery 21 is stepped down and isolated to generate a second DC power.

[0040] The DC / DC converter 22 also has its output set to 24V DC, consistent with the main power supply output voltage, to ensure compatibility with load 5.

[0041] The outputs of the main power supply circuit 1 and the backup power supply circuit 2 are connected in parallel to a common DC bus 3 via a relay 4, so that when the main power supply circuit 1 is working normally, the backup power supply circuit 2 is in an open state. When the main power supply circuit 1 loses power (i.e., the 220VAC input is interrupted), the backup power supply circuit 2 starts, and the energy storage battery 21 continues to provide uninterrupted 24V power to the load 5 through the DC / DC converter 22.

[0042] When the switching power supply 11 is working normally, the coil of the relay 4 is energized, its normally open contact closes, thereby connecting the main power supply circuit 1, which then supplies power to the load 5.

[0043] When the switching power supply 11 is de-energized, the coil of relay 4 is de-energized, its normally closed contact closes, and the output terminal of DC / DC converter 22 is connected to DC bus 3, that is, the backup power supply circuit 2 is connected to DC bus 3, and the backup power supply circuit 2 supplies power to the load 5.

[0044] In this embodiment, relay 4 is a magnetic latching relay. A magnetic latching relay can maintain its state without requiring continuous power to the coil after power loss, which can greatly reduce the standby power consumption of the backup circuit itself.

[0045] Load 5 includes at least one of the following: Battery Management System (BMS), Energy Management System (EMS), Fire Control System, and Communication and I / O System.

[0046] Communication and I / O include at least one of the following: industrial switch, 4G / 5G router, HMI touch screen, protocol conversion gateway, and GPS / BeiDou timing module.

[0047] This utility model directly supplies power to the load 5 by using a DC / DC converter 22, achieving significant advantages over traditional UPS power supply solutions, specifically in the following four aspects:

[0048] First, high power efficiency: By eliminating the multiple AC / DC and DC / AC conversion steps in the UPS solution, energy loss is greatly reduced. The power efficiency of the DC / DC converter 22 is greater than 97%, which is much higher than the efficiency of UPS, which is usually less than 85%.

[0049] Second, long service life: The DC / DC converter 22 is a purely electronic product, and there are no chemical losses or charge / discharge cycle life issues like those of batteries in UPS. Its service life can reach more than 10 years, far exceeding the average lifespan of 3 to 4 years for UPS batteries.

[0050] Third, compact size: By eliminating the battery pack and complex multi-stage conversion circuit inside the UPS, the size of the DC / DC converter 22 is significantly reduced, making the overall size of the energy storage cabinet integrating this backup power solution only one-quarter of that of the UPS solution.

[0051] Fourth, low cost: Because it eliminates the need for dedicated UPS batteries and corresponding management switching circuits, the material and manufacturing costs of the integrated energy storage cabinet are significantly reduced, with the overall cost being about one-fifth of that of a UPS solution.

[0052] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An integrated energy storage cabinet, characterized in that, include: The cabinet and the main power supply circuit, backup power supply circuit, DC bus and relays installed in the cabinet; The main power supply circuit includes a switching power supply and a diode. The input terminal of the switching power supply is connected to the power supply bus, and the output terminal of the switching power supply is connected to the DC bus through the diode to supply power to the load. The switching power supply is used to convert the AC power of the power supply bus into a first DC power. The diode is used to prevent reverse current. The backup power supply circuit includes a PCS, an energy storage battery, and a DC / DC converter. The energy storage battery is electrically connected to the power supply bus through the PCS. The input terminal of the DC / DC converter is electrically connected to the energy storage battery. The DC / DC converter is used to convert the high-voltage DC power provided by the energy storage battery into a second DC power. The coil of the relay is electrically connected to the output terminal of the switching power supply; the normally closed contact of the relay is connected between the DC / DC converter and the DC bus; the normally open contact of the relay is unused. When the switching power supply is working normally, the coil of the relay is energized, the normally open contact is closed, and the main power supply circuit supplies power to the load. When the switching power supply is de-energized, the relay coil is de-energized, the normally closed contact closes, and the backup power supply circuit is connected to the DC bus to supply power to the load.

2. The integrated energy storage cabinet according to claim 1, characterized in that, The load includes at least one of a battery management system (BMS), an energy management system (EMS), a fire control system, and a communication and I / O system.

3. The integrated energy storage cabinet according to claim 1, characterized in that, The switching power supply is an AC / DC switching power supply, which includes an AC terminal and a DC terminal. The input voltage of the AC terminal is 220V, and the output voltage of the DC terminal is 24V.

4. The integrated energy storage cabinet according to claim 1, characterized in that, The input voltage of the DC / DC converter is 832V, and the output voltage of the DC / DC converter is 24V.

5. The integrated energy storage cabinet according to claim 1, characterized in that, The energy storage battery is any one of ternary lithium batteries, lithium iron phosphate batteries, lithium titanate batteries, lithium manganese oxide batteries, or lead-acid batteries.

6. The integrated energy storage cabinet according to claim 1, characterized in that, The power supply bus outputs 380V AC power.

7. The integrated energy storage cabinet according to claim 1, characterized in that, The relay is a magnetic latching relay.

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