Alternating current and direct current charging and discharging device of energy storage cabinet

Abstract

According to the AC / DC charging and discharging device of the energy storage cabinet provided by the utility model, through the DC-DC inverter and the third DC relay arranged in the first power transmission module, the parameters of the DC output by the first power transmission module can be adjusted according to the DC electricity demand of a new energy power vehicle, thereby realizing the DC charging of the new energy power vehicle; according to the utility model, alternating current of an external power grid is converted into direct current through the DC-AC inverter arranged in the second power transmission module, so that direct current charging can be carried out on the first power supply module, and meanwhile, the peak value and frequency of the alternating current output by the second power transmission module can be adjusted through the alternating current circuit breaker arranged in the second power transmission module; therefore, the charging requirement of external AC charging equipment is met. According to the utility model, the operation of the first power transmission module and the second power transmission module is controlled through the control module, thereby realizing the switching of AC / DC charging and discharging functions, and satisfying the AC / DC charging requirement of a new energy power vehicle as a mobile power supply.

Description

Technical Field

[0001] This utility model relates to the field of charging technology, specifically to an AC / DC charging and discharging device for an energy storage cabinet. Background Technology

[0002] With the increasing application of new energy vehicles in the industrial sector, these vehicles rely on well-developed charging infrastructure. To address the lack of basic charging facilities in outdoor or construction site environments, a large number of outdoor energy storage cabinets have emerged. While current outdoor energy storage cabinets offer ample power and grid-connected / off-grid functionality, their output power is three-phase, only suitable for AC input / output devices. They cannot switch between AC and DC charging / discharging, thus preventing them from being used as mobile power sources for charging various new energy engineering vehicles. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the existing technology by proposing an AC / DC charging and discharging device for an energy storage cabinet.

[0004] This utility model proposes an AC / DC charging and discharging device for an energy storage cabinet, the device comprising:

[0005] The system comprises a first power supply module, a first power transmission module, a second power transmission module, a control module, and a second power supply module.

[0006] The first power module is electrically connected to the first power transmission module, and the first power module is used to supply power to the first power transmission module;

[0007] The first power transmission module is used to output direct current;

[0008] The second power transmission module is electrically connected to the first power module. The second power transmission module is connected to an external AC power grid. The second power transmission module is used to convert the AC power from the external AC power grid into DC power and charge the first power module based on the converted DC power.

[0009] The control module is connected to the first power module, the first power transmission module, and the second power transmission module respectively, and the control module is used to control the working status of the first power module, the first power transmission module, and the second power transmission module respectively.

[0010] The second power module is connected to the control module, and the second power module is used to supply power to the control module.

[0011] Furthermore, the first power module includes a battery stack, a fuse, a Hall sensor, a first DC relay, a second DC relay, and a DC circuit breaker. The DC circuit breaker includes a first DC air switch and a second DC air switch. One electrode of the battery stack is connected in series with the fuse, the first DC air switch, and the first DC relay in sequence, and the other electrode of the battery stack is connected in series with the Hall sensor, the second DC air switch, and the second DC relay in sequence.

[0012] Furthermore, the device also includes a pre-charging module for pre-charging the first power transmission module. The pre-charging module is connected in parallel with the first DC relay. One end of the pre-charging module is electrically connected to the DC circuit breaker, and the other end of the pre-charging module is electrically connected to the first power transmission module and the second power transmission module, respectively. The pre-charging module includes a pre-charging relay and a pre-charging resistor, which are connected in series.

[0013] Furthermore, the two ends of the first power transmission module are electrically connected to the two electrodes of the first power supply module, and the first power transmission module includes a DC-DC inverter and a third DC relay, wherein the third DC relay is connected in series with the DC-DC inverter.

[0014] Furthermore, the second power transmission module includes a DC-AC inverter and an AC circuit breaker. One end of the DC-AC inverter is electrically connected to the AC circuit breaker. The DC-AC inverter is used to convert AC power from the external power grid into DC power. The AC circuit breaker is used to adjust the peak value and frequency of the AC power output by the second power transmission module.

[0015] Furthermore, the device also includes a first load module, which includes a liquid-cooled unit, a single-phase AC dehumidifier, and an AC charging device. The liquid-cooled unit, the single-phase AC dehumidifier, and the AC charging device are electrically connected to the second power transmission module through different AC air switches.

[0016] Furthermore, the second power module includes an AC-DC inverter and a backup battery connected in series. One end of the AC-DC inverter that is electrically connected to the second power transmission module is equipped with an AC air switch, and the other end of the AC-DC inverter that is electrically connected to the backup battery is equipped with a third DC air switch.

[0017] Furthermore, the device also includes a second load module, which includes a switch, a water immersion device, a fire detection device, and a display screen. The water immersion device, the fire detection device, and the display screen are each electrically connected to one end of the AC-DC inverter that is electrically connected to a backup battery.

[0018] Beneficial effects: This invention adjusts the parameters of the DC power output from the first power supply module according to the DC power requirements of new energy vehicles through the first power transmission module, thereby realizing DC charging of new energy vehicles. This invention also converts the AC power from the external power grid into DC power through the second power transmission module, enabling DC charging of the first power supply module. Simultaneously, it adjusts the peak value and frequency of the AC power output from the second power transmission module to meet the charging requirements of external AC charging equipment. This invention controls the operation of the first and second power transmission modules through a control module, enabling switching between AC and DC charging / discharging functions, thus serving as a mobile power source to meet the AC and DC charging needs of new energy vehicles. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0020] Figure 1 This is a schematic diagram of an AC / DC charging and discharging device for an energy storage cabinet according to an embodiment of the present invention.

[0021] Figure 2 This is a circuit diagram of an AC / DC charging and discharging device for an energy storage cabinet according to an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, 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, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0023] In the following description, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The following description provides multiple embodiments of this application, which can be substituted or combined with each other. Therefore, this application can also be considered to include all possible combinations of the same and / or different embodiments described. Thus, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then this application should also be considered to include embodiments containing one or more other possible combinations of A, B, C, and D, even if such embodiments are not explicitly described in the following text.

[0024] like Figure 1 As shown in the figure, this utility model embodiment provides an AC / DC charging and discharging device for an energy storage cabinet, the device comprising:

[0025] The system comprises a first power supply module, a first power transmission module, a second power transmission module, a control module, and a second power supply module.

[0026] The first power module is electrically connected to the first power transmission module, and the first power module is used to supply power to the first power transmission module;

[0027] The first power transmission module is used to output direct current;

[0028] The second power transmission module is electrically connected to the first power module. The second power transmission module is connected to an external AC power grid. The second power transmission module is used to convert the AC power from the external AC power grid into DC power and charge the first power module based on the converted DC power.

[0029] The control module is connected to the first power module, the first power transmission module, and the second power transmission module respectively, and the control module is used to control the working status of the first power module, the first power transmission module, and the second power transmission module respectively.

[0030] The second power module is connected to the control module, and the second power module is used to supply power to the control module.

[0031] In the embodiments of this specification, the control module can be a Hangshun Chip HK32F030M series BMS (Battery Management System) or a Huawei Pioneer APM32F407ZGT6 series BMS, etc. Since different models of control modules are applicable to different voltages and currents, the specific model of the control module is determined according to the actual power specifications of this utility model. For example... Figure 1As shown, the control module is connected to the first power supply module, the first power transmission module, and the second power transmission module via signals. The control module can be connected by a direct signal line, or a wireless signal receiving module can be installed in the first power supply module, the first power transmission module, and the second power transmission module for electrical connection. Whether it is a signal line connection or a wireless signal receiving module is used to receive signals, it is a communication control method.

[0032] Since many external charging devices lack corresponding inverters, they can only perform standalone DC charging or standalone AC charging. When it is necessary to DC charge an externally connected DC charging device, such as a power supply for a new energy vehicle, the control module will supply power to the first power module and the first transmission module based on the control connection, while simultaneously disconnecting the second transmission module from the first power module and the second power module. This ensures that the DC power output of the energy storage cabinet's AC / DC charging and discharging device in this embodiment is not interfered with by the AC power from the external power grid connected to the second transmission module.

[0033] When an external AC charging device needs to be charged, the control module will control the second power transmission module to connect with the first power module. The second power transmission module will supply power to the electrically connected first power module. At the same time, the connection between the second power transmission module and the second power module can be connected, so that the AC charging process and the DC charging of the first power transmission module can be carried out simultaneously.

[0034] In one possible implementation, the first power module includes a battery stack, a fuse, a Hall sensor, a first DC relay, a second DC relay, and a DC circuit breaker. The DC circuit breaker includes a first DC air switch and a second DC air switch. One electrode of the battery stack is connected in series with the fuse, the first DC air switch, and the first DC relay in sequence, and the other electrode of the battery stack is connected in series with the Hall sensor, the second DC air switch, and the second DC relay in sequence.

[0035] like Figure 1 and Figure 2 As shown in the embodiments of this specification, the first power module includes a battery stack, a fuse FU1, a Hall sensor, a first DC relay KM2, a second DC relay KM3, and a DC circuit breaker QF2. The first DC relay KM2 and the second DC relay KM3 act as positive and negative DC relays, respectively, to control the energization of the first power module. When the battery stack needs charging, the second power module outputs DC power to the control module BMS, closing the second DC relay KM3, the first DC relay KM2, and the DC circuit breaker, thereby charging the battery stack through the second power transmission module.

[0036] In one possible implementation, the AC / DC charging and discharging device for the energy storage cabinet provided in this embodiment further includes a pre-charging module. The pre-charging module is used to pre-charge the first power transmission module. The pre-charging module is connected in parallel with the first DC relay. One end of the pre-charging module is electrically connected to the DC circuit breaker, and the other end of the pre-charging module is electrically connected to the first power transmission module and the second power transmission module respectively. The pre-charging module includes a pre-charging relay and a pre-charging resistor, and the pre-charging relay and the pre-charging resistor are connected in series.

[0037] like Figure 1 and Figure 2 As shown in the embodiments of this specification, the pre-charge module includes a pre-charge relay KM1 and a pre-charge resistor R. When the battery stack of the first power module needs charging, the second DC relay KM3 and the pre-charge relay KM1 are closed first. After pre-charging for a period of time, the pre-charge relay KM1 is opened, and then the first DC relay KM2 is closed. The main function of the pre-charge module is to protect the components during the first power supply process, preventing damage to the components caused by the large current generated by the sudden change in current at the moment of power connection, since the voltage across the capacitor cannot change abruptly but the current changes abruptly. At the same time, the pre-charge module can also realize the safe start-up of each circuit switch and power supply, improving the service life of the circuit.

[0038] In one possible implementation, the two ends of the first power transmission module are electrically connected to the two electrodes of the first power supply module, and the first power transmission module includes a DC-DC inverter and a third DC relay, wherein the third DC relay is connected in series with the DC-DC inverter.

[0039] Figure 2 As shown, the first power transmission module includes a DC-DC inverter and a third DC relay KM4. In the embodiments of this specification, when an external DC charging device connected to the first power transmission module needs to be charged, the third DC relay KM4 will close, and the DC-DC inverter will convert the voltage of the DC current supplied by the first power source into the voltage required by the external DC charging device, thereby realizing DC charging of new energy vehicles.

[0040] In one possible implementation, the second power transmission module includes a DC-AC inverter and an AC circuit breaker. One end of the DC-AC inverter is electrically connected to the AC circuit breaker. The DC-AC inverter is used to convert AC power from the external power grid into DC power. The AC circuit breaker is used to adjust the peak value and frequency of the AC power output by the second power transmission module.

[0041] like Figure 2As shown in the embodiment of this specification, the second power transmission module includes a DC-AC inverter and an AC circuit breaker QFB1. When the second power transmission module charges the first power module, the DC-AC inverter converts the external AC power into the DC power required by the first power module. In this embodiment, the DC-AC inverter is a bidirectional inverter, capable of both DC-to-AC and AC-to-DC conversion. The second power transmission module can also adjust the peak value and frequency of the AC power output by the AC circuit breaker QFB1, thereby enabling AC charging of the second power module and charging of external AC charging devices, ensuring that the second power transmission module can output AC power normally. In addition, the AC circuit breaker QFB1 can also disconnect the faulty circuit when a fault occurs in the device of this embodiment, protecting the safety of the components of each functional module.

[0042] In one possible implementation, the energy storage cabinet AC / DC charging and discharging device provided in this embodiment includes a first load module. The first load module includes a liquid chiller, a single-phase AC dehumidifier, and an AC charging device. The liquid chiller, the single-phase AC dehumidifier, and the AC charging device are electrically connected to the second power transmission module through different AC air switches.

[0043] like Figure 2 As shown in the embodiment of this specification, the first load module includes a liquid-cooled unit, a single-phase AC dehumidifier, and an AC charging device, as well as AC air switches QFA2, QFA3, and QFA4. When the second output module charges the first and second power modules, a large amount of heat is generated. To ensure the safety and normal operation of the device in this embodiment, the liquid-cooled unit is needed for cooling. Simultaneously, to prevent water vapor generated during cooling from damaging the equipment, the single-phase AC dehumidifier is needed for dehumidification. The number of loads in the first load module can be set according to actual conditions and is not limited to a liquid-cooled unit, a single-phase AC dehumidifier, and an AC charging device. Each load device is equipped with a corresponding air switch to protect the circuit safety.

[0044] In one possible implementation, the second power module includes an AC-DC inverter and a backup battery connected in series. One end of the AC-DC inverter that is electrically connected to the second power transmission module is provided with an AC air switch, and the other end of the AC-DC inverter that is electrically connected to the backup battery is provided with a third DC air switch.

[0045] like Figure 2As shown in the embodiments of this specification, the second power module includes an AC-DC inverter, a backup battery, and a third DC air switch QFC1 connected in series. The function of the second power module is to supply power to the control module BMS. It can be directly powered by the backup battery, or the AC-DC inverter can convert the AC power output from the second output module into the DC power required by the control module BMS. The AC-DC inverter is a device that converts AC power to DC power, and its function is the opposite of an inverter that converts DC power to AC power. Furthermore, the second output module can supply power to the control module BMS while simultaneously supplying power to the backup battery. The backup power source can be a lead-acid battery, a ternary lithium battery, or a lithium iron phosphate battery, etc.

[0046] In one possible implementation, this embodiment provides an AC / DC charging and discharging device for an energy storage cabinet. The device further includes a second load module, which includes a switch, a water immersion device, a fire detection device, and a display screen. The water immersion device, the fire detection device, and the display screen are each electrically connected to one end of the AC-DC inverter that is electrically connected to a backup battery.

[0047] like Figure 2 As shown in the embodiments of this specification, the second load module includes a switch, a water immersion device, a fire detection device, and a display screen. The switch transmits the operating status of the device in this embodiment to the detection equipment or cloud platform in a timely manner. The water immersion device detects whether water immersion occurs around the device, and issues an alarm when water immersion occurs, which is then transmitted to the switch. The fire detection device detects overheating and potential fire in the device. The display screen displays the real-time operating status of each component of the device. Alternatively, a touch screen can be used to visually integrate the control commands of the control module, allowing for one-button input of control commands to improve the ease of operation of the device. The second load module can be powered by a backup battery and the second load module itself, thus maintaining normal operation of the second load module even when the external AC power grid is interrupted.

[0048] It should be noted that in the description of this application, the terms "upper end," "lower end," and "bottom end," indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device 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 application. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise limited, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An AC / DC charging and discharging device for an energy storage cabinet, characterized in that, The device includes: The system comprises a first power supply module, a first power transmission module, a second power transmission module, a control module, and a second power supply module. The first power module is electrically connected to the first power transmission module, and the first power module is used to supply power to the first power transmission module; The first power transmission module is used to output direct current; The second power transmission module is electrically connected to the first power module. The second power transmission module is connected to an external AC power grid. The second power transmission module is used to convert the AC power from the external AC power grid into DC power and charge the first power module based on the converted DC power. The control module is connected to the first power module, the first power transmission module, and the second power transmission module respectively, and the control module is used to control the working status of the first power module, the first power transmission module, and the second power transmission module respectively. The second power module is connected to the control module, and the second power module is used to supply power to the control module.

2. The AC / DC charging and discharging device for an energy storage cabinet according to claim 1, characterized in that, The first power module includes a battery stack, a fuse, a Hall sensor, a first DC relay, a second DC relay, and a DC circuit breaker. The DC circuit breaker includes a first DC air switch and a second DC air switch. One electrode of the battery stack is connected in series with the fuse, the first DC air switch, and the first DC relay in sequence. The other electrode of the battery stack is connected in series with the Hall sensor, the second DC air switch, and the second DC relay in sequence.

3. The AC / DC charging and discharging device for an energy storage cabinet according to claim 2, characterized in that, The device further includes a pre-charging module for pre-charging the first power transmission module. The pre-charging module is connected in parallel with the first DC relay. One end of the pre-charging module is electrically connected to the DC circuit breaker, and the other end of the pre-charging module is electrically connected to the first power transmission module and the second power transmission module respectively. The pre-charging module includes a pre-charging relay and a pre-charging resistor, and the pre-charging relay and the pre-charging resistor are connected in series.

4. The AC / DC charging and discharging device for an energy storage cabinet according to claim 1, characterized in that, The two ends of the first power transmission module are electrically connected to the two electrodes of the first power supply module, respectively. The first power transmission module includes a DC-DC inverter and a third DC relay, and the third DC relay is connected in series with the DC-DC inverter.

5. The AC / DC charging and discharging device for an energy storage cabinet according to claim 1, characterized in that, The second power transmission module includes an AC-DC inverter and an AC circuit breaker. One end of the AC-DC inverter is electrically connected to the AC circuit breaker. The AC-DC inverter is used to convert AC power from the external power grid into DC power. The AC circuit breaker is used to adjust the peak value and frequency of the AC power output by the second power transmission module.

6. The AC / DC charging and discharging device for an energy storage cabinet according to claim 1, characterized in that, The device further includes a first load module, which includes a liquid chiller, a single-phase AC dehumidifier, and an AC charging device. The liquid chiller, the single-phase AC dehumidifier, and the AC charging device are electrically connected to the second power transmission module through different AC air switches.

7. The AC / DC charging and discharging device for an energy storage cabinet according to claim 1, characterized in that, The second power module includes an AC-DC inverter and a backup battery connected in series. One end of the AC-DC inverter that is electrically connected to the second power transmission module is equipped with an AC air switch, and the other end of the AC-DC inverter that is electrically connected to the backup battery is equipped with a third DC air switch.

8. The AC / DC charging and discharging device for an energy storage cabinet according to claim 7, characterized in that, The device also includes a second load module, which includes a switch, a water immersion device, a fire detection device, and a display screen. The water immersion device, the fire detection device, and the display screen are each electrically connected to one end of the AC-DC inverter that is electrically connected to a backup battery.

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