Energy storage cabinet and charging and discharging system

Abstract

The utility model relates to an energy storage cabinet and a charging and discharging system, and relates to the technical field of energy transmission, the energy storage cabinet comprises an energy storage module and an energy conversion module, and communication and bidirectional energy transmission between the energy storage module and a new energy automobile can be realized by connecting the energy conversion module and the energy storage module. The energy storage cabinet can charge the new energy vehicle, and the new energy vehicle can also reversely charge the energy storage cabinet, so that the energy storage cabinet can be charged under the condition that a power grid has no time to supply power, electric energy in the new energy vehicle is recycled, and waste of the electric energy in the new energy vehicle is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy transmission, in particular to a storage cabinet and a charging and discharging system. BACKGROUND

[0002] The storage cabinet is a device specially used for storing electric energy, which can only receive charging from the power grid.

[0003] However, when the power demand of the power grid is at a peak or the power grid is insufficient, the power grid has no time to supply power to the storage cabinet, and the storage cabinet will be in a power shortage, resulting in the inability to provide electric energy to the outside world. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a storage cabinet and a charging and discharging system, which improve the diversity of the charging path of the storage cabinet to at least partially solve the above technical problems.

[0005] In order to achieve the above purpose, according to the first aspect of the present application, a storage cabinet is provided, which comprises a storage module and an energy conversion module, the energy conversion module is connected with the storage module, and is used for realizing communication and bidirectional energy transmission between the storage module and a new energy vehicle.

[0006] Optionally, the storage module comprises a storage battery pack and a storage management unit, the storage battery pack is connected with the energy conversion module; the storage management unit is connected with the storage battery pack and the energy conversion module.

[0007] Optionally, the energy conversion module comprises a direct current conversion unit and a communication unit, the direct current conversion unit is connected with the storage battery pack, and is used for realizing energy conversion and transmission between the storage battery pack and a power battery pack of the new energy vehicle; the communication unit is connected with the storage management unit, and is used for realizing communication between the storage management unit and a battery management unit of the new energy vehicle.

[0008] Optionally, the energy conversion module further comprises a charging gun, one end of the charging gun is connected with the direct current conversion unit, and the other end of the charging gun is used for connecting a charging and discharging interface of the new energy vehicle.

[0009] Optionally, the energy conversion module further comprises a temperature detection unit and a power matching unit, the temperature detection unit is used for detecting the real-time temperature of at least one of the direct current conversion unit and the charging gun; the power matching unit is connected with the temperature detection unit, the direct current conversion unit and the communication unit, and is used for adjusting the charging power between the storage battery pack and the power battery pack according to the real-time temperature and a charging strategy.

[0010] Optionally, if the real-time temperature is greater than or equal to the preset temperature, the power matching unit controls the DC conversion unit to decrease at least one of the charging voltage and the charging current according to the charging strategy; if the real-time temperature is less than the preset temperature, the power matching unit controls the DC conversion unit to increase at least one of the charging voltage and the charging current according to the charging strategy.

[0011] Optionally, the power matching unit determines the charging power according to the real-time temperature and the charging strategy, and transmits the charging power to at least one of the energy storage management unit and the battery management unit through the communication unit, so as to control at least one of the charging voltage and the charging current through at least one of the energy storage management unit and the battery management unit.

[0012] Optionally, the temperature detection unit is connected with the communication unit, so as to transmit the real-time temperature to at least one of the energy storage management unit and the battery management unit.

[0013] Optionally, during the process that the new energy vehicle charges the energy storage module, when the state of charge of the energy storage module reaches a preset value, the new energy vehicle stops charging the energy storage module.

[0014] According to a second aspect of the present application, a charging and discharging system is provided, which comprises the energy storage cabinet and the new energy vehicle.

[0015] Optionally, the charging and discharging system further comprises a box-type substation and a rectifier module, the box-type substation is used for accessing alternating current, and the rectifier module is connected between the box-type substation and the energy storage cabinet.

[0016] Optionally, the charging and discharging system further comprises a charging host and a charging pile, the charging host is connected with the energy storage cabinet and the rectifier module, and the charging pile is connected with the charging host and is used for charging the new energy vehicle.

[0017] The energy storage cabinet and the charging and discharging system of the embodiments of the present application can realize communication and bidirectional energy transmission between the energy storage module and the new energy vehicle by connecting the energy conversion module and the energy storage module, not only can the energy storage cabinet charge the new energy vehicle, but also the new energy vehicle can reversely charge the energy storage cabinet, which can charge the energy storage cabinet in the case that the power grid cannot supply power, and at the same time, the electric energy in the new energy vehicle is recycled, so that the electric energy in the new energy vehicle is avoided from being wasted.

[0018] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0020] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0021] Figure 1 is a principle block diagram of an energy storage cabinet provided in one exemplary embodiment of the present disclosure;

[0022] Figure 2 is a principle block diagram of an energy storage module provided in one exemplary embodiment of the present disclosure;

[0023] Figure 3 is a principle block diagram of an energy storage cabinet provided in one exemplary embodiment of the present disclosure;

[0024] Figure 4 is a working flow diagram of an energy conversion module provided in one exemplary embodiment of the present disclosure;

[0025] Figure 5 is a principle block diagram of a charging and discharging system provided in one exemplary embodiment of the present disclosure.

[0026] Explanation of reference numerals:

[0027] 100, energy storage cabinet;

[0028] 10, energy conversion module; 11, direct current conversion unit; 12, communication unit; 13, charging gun; 14, temperature detection unit; 15, power matching unit;

[0029] 20, energy storage module; 21, energy storage battery pack; 22, energy storage management unit;

[0030] 200, new energy vehicle; 201, power battery pack; 202, battery management unit;

[0031] 300, box-type substation;

[0032] 400, rectifier module;

[0033] 500, charging host;

[0034] 600, charging pile;

[0035] 1000, charging and discharging system. DETAILED DESCRIPTION

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0037] This application provides an energy storage cabinet 100; please refer to [link / reference]. Figures 1 to 5 ,like Figure 1 As shown, the energy storage cabinet 100 includes an energy storage module 20 and an energy conversion module 10. The energy conversion module 10 is connected to the energy storage module 20 and is used to realize communication and bidirectional energy transmission between the energy storage module 20 and the new energy vehicle 200.

[0038] It is understood that the energy storage cabinet 100 in this embodiment of the application, by connecting the energy conversion module 10 and the energy storage module 20, can realize communication and bidirectional energy transmission between the energy storage module 20 and the new energy vehicle 200. Not only can the energy storage cabinet 100 charge the new energy vehicle 200, but the new energy vehicle 200 can also charge the energy storage cabinet 100 in reverse. This can supplement the energy storage cabinet 100 when the power grid is unavailable, and at the same time recover the electrical energy in the new energy vehicle 200, avoiding the waste of electrical energy in the new energy vehicle 200.

[0039] It should be noted that the energy storage cabinet 100 may also include a fire suppression module and cabinet structural components. The fire suppression module is used to extinguish fires and / or trigger fire alarms in the event of a fire in the energy storage cabinet 100. The cabinet structural components can be used to support at least one of the energy storage module 20, the energy conversion module 10, and the fire suppression module. In some embodiments, such as Figure 2 As shown, the energy storage module 20 includes an energy storage battery pack 21 and an energy storage management unit 22. The energy storage battery pack 21 is connected to the energy conversion module 10; the energy storage management unit 22 is connected to the energy storage battery pack 21 and the energy conversion module 10.

[0040] It should be noted that the energy storage battery pack 21 may include at least one battery, and multiple batteries may be connected in series and / or in parallel. The battery may be a lithium-ion battery, which consists of a positive electrode, a negative electrode, an electrolyte, a separator, and a current collector.

[0041] The energy storage management unit 22 serves as the battery management system (BMS) for the energy storage battery pack 21. It mainly has functions such as battery information acquisition, equalization control, state of charge (SOC) / state of health (SOH) estimation, safety management, temperature control, and fault diagnosis.

[0042] In some of these embodiments, such as Figure 3As shown, the energy conversion module 10 comprises a direct current conversion unit 11 and a communication unit 12, the direct current conversion unit 11 is connected with the energy storage battery pack 21, and is used for realizing energy conversion and transmission between the energy storage battery pack 21 and the power battery pack 201 of the new energy vehicle 200; the communication unit 12 is connected with the energy storage management unit 22, and is used for realizing communication between the energy storage management unit 22 and the battery management unit 202 of the new energy vehicle 200.

[0043] It needs to be explained that the direct current conversion unit 11 can be a kind of bidirectional direct current conversion circuit, which can convert one direct current voltage into another direct current voltage. The communication unit 12 can be a kind of communication circuit, which is used for realizing communication between the two.

[0044] In some embodiments, as shown in the figure, Figure 3 As shown, the energy conversion module 10 further comprises a charging gun 13, one end of the charging gun 13 is connected with the direct current conversion unit 11, and the other end of the charging gun 13 is used for connecting the charging and discharging interface of the new energy vehicle 200.

[0045] It needs to be explained that the charging gun 13 is additionally arranged in the energy conversion module 10 in the embodiment, so as to facilitate quick connection between the energy storage cabinet 100 and the new energy vehicle 200.

[0046] In some embodiments, as shown in the figure, Figure 3 As shown, the energy conversion module 10 further comprises a temperature detection unit 14 and a power matching unit 15, the temperature detection unit 14 is used for detecting real-time temperature of at least one of the direct current conversion unit 11 and the charging gun 13; the power matching unit 15 is connected with the temperature detection unit 14, the direct current conversion unit 11 and the communication unit 12, and is used for adjusting charging power between the energy storage battery pack 21 and the power battery pack 201 according to real-time temperature and charging strategy.

[0047] It needs to be explained that the temperature detection unit 14 can comprise some temperature sensors, at least one temperature sensor is used for detecting real-time temperature of the charging gun 13, and at least one temperature sensor is used for detecting real-time temperature of the direct current conversion unit 11.

[0048] In some embodiments, if the real-time temperature is greater than or equal to a preset temperature, the power matching unit 15 controls the direct current conversion unit 11 to reduce at least one of charging voltage and charging current according to the charging strategy; if the real-time temperature is less than the preset temperature, the power matching unit 15 controls the direct current conversion unit 11 to increase at least one of the charging voltage and the charging current according to the charging strategy.

[0049] It should be noted that the charging strategy can be a charging control method of the new energy vehicle 200 to the energy storage cabinet 100, or a charging control method of the energy storage cabinet 100 to the new energy vehicle 200. The charging strategy can include adjusting at least one of the charging voltage and the charging current, for example, reducing at least one of the charging voltage and the charging current, or increasing at least one of the charging voltage and the charging current. In this way, the charging efficiency can be improved under the condition of safe charging.

[0050] In some embodiments, the power matching unit 15 determines the charging power according to the real-time temperature and the charging strategy, and transmits the charging power to at least one of the energy storage management unit 22 and the battery management unit 202 through the communication unit 12, so as to control at least one of the charging voltage and the charging current through at least one of the energy storage management unit 22 and the battery management unit 202.

[0051] It should be noted that the energy storage management unit 22 can control at least one of the charging voltage and the charging current output by the energy storage battery pack 21. The battery management unit 202 can control at least one of the charging voltage and the charging current output by the power battery pack 201.

[0052] In some embodiments, the temperature detection unit 14 is connected with the communication unit 12 to transmit the real-time temperature to at least one of the energy storage management unit 22 and the battery management unit 202.

[0053] It should be noted that in this way, at least one of the energy storage management unit 22 and the battery management unit 202 can also adjust at least one of the charging voltage and the charging current according to the real-time temperature, so as to improve the charging efficiency under the condition of safe charging.

[0054] In some embodiments, during the process of charging the energy storage module 20 by the new energy vehicle 200, when the state of charge of the energy storage module 20 reaches a preset value, the new energy vehicle 200 stops charging the energy storage module 20.

[0055] It should be noted that when the state of charge of the energy storage module 20 reaches the preset value, it means that the energy of the energy storage module 20 is full, and at this time, stopping charging the energy storage module 20 can avoid wasting the electric energy in the new energy vehicle 200.

[0056] Figure 4 is a working flow diagram of the energy conversion module 10 provided in the exemplary embodiments of the present disclosure. It includes the following contents:

[0057] Whether the charging gun 13 signal is detected: the charging gun 13 of the energy conversion module 10 is inserted into the charging and discharging port of the new energy vehicle 200, and the energy conversion module 10 starts charging after monitoring the charging gun 13 signal. If the energy conversion module 10 does not monitor the charging gun 13 signal, it will continue to monitor the charging gun 13 signal.

[0058] The energy storage management unit 22 sends a charging request to the energy conversion module 10, which in turn sends the charging request to the battery management unit 202 of the new energy vehicle 200. After the battery management unit 202 of the new energy vehicle 200 determines that it has external discharge conditions, it feeds back information to the communication unit 12 of the energy conversion module 10, so that the energy storage battery pack 21 and the power battery pack 201 interact and match power in the energy conversion module 10. After that, the DC conversion unit 11 completes the matching of voltage and current between the energy storage battery pack 21 and the power battery pack 201, and starts energy transmission.

[0059] During transmission, the gun line of the charging gun 13 and the DC conversion unit 11 will heat up. The temperature detection unit 14 can monitor the temperature of the DC conversion unit 11 and the gun line of the charging gun 13, and transmit the real-time temperature to the power matching unit 15. The power matching unit 15 matches the charging current and charging voltage (real-time power demand) according to the real-time temperature, charging strategy (including the SOC, SOH of the energy storage battery pack 21 and the power battery pack 201, and the power required by the charging host 500 to be provided by the energy storage cabinet 100), and then transmits the real-time power demand to the energy storage management unit 22 and the battery management unit 202 for energy transmission.

[0060] When the energy storage battery pack 21 is charged to the expected SOC (preset value), the charging is ended. When the energy storage battery pack 21 is not charged to the expected SOC, the charging continues.

[0061] The control logic of the energy storage cabinet 100 charging the new energy vehicle 200 is completely opposite to the above logic, and can be analogized.

[0062] In summary, the energy conversion module 10 has intelligent control and judgment strategy, which can match and calculate the optimal energy transmission strategy according to the temperature of the energy conversion module 10 and / or the charging gun 13, the SOC, SOH of the energy storage battery pack 21 and the power battery pack 201, and the power required by the charging host 500 to be provided by the energy storage cabinet 100.

[0063] The current of charging and discharging can be adjusted in time according to the temperature of the DC conversion unit 11 and the gun line of the charging gun 13 monitored by the temperature detection unit 14, to protect the service life of the energy conversion module 10.

[0064] In addition, new energy vehicles can not only charge the energy storage cabinet 100, but the energy storage cabinet 100 can also directly supply power to the charging pile 600 and / or other energy storage cabinets 100, thus achieving greater power supply efficiency.

[0065] This application also provides a charging and discharging system 1000, such as... Figure 5 As shown, the charging and discharging system 1000 includes the aforementioned energy storage cabinet 100 and new energy vehicle 200.

[0066] It is understood that, since the charging and discharging system 1000 of this application embodiment includes the aforementioned energy storage cabinet 100, it can also achieve communication and bidirectional energy transmission between the energy storage module 20 and the new energy vehicle 200 by connecting the energy conversion module 10 and the energy storage module 20. Not only can the energy storage cabinet 100 charge the new energy vehicle 200, but the new energy vehicle 200 can also charge the energy storage cabinet 100 in reverse. This can replenish the energy storage cabinet 100 when the power grid is unavailable, and at the same time recover the electrical energy in the new energy vehicle 200, avoiding the waste of electrical energy in the new energy vehicle 200.

[0067] In some of these embodiments, such as Figure 5 As shown, the charging and discharging system 1000 also includes a prefabricated substation 300 and a rectifier module 400. The prefabricated substation 300 is used to connect to AC power; the rectifier module 400 is connected between the prefabricated substation 300 and the energy storage cabinet 100.

[0068] It should be noted that the prefabricated substation 300 can step down the AC power from the grid, and the rectifier module 400 converts the stepped-down AC power into the corresponding DC power to replenish the energy storage cabinet 100.

[0069] In some of these embodiments, such as Figure 5 As shown, the charging and discharging system 1000 also includes a charging host 500 and a charging pile 600. The charging host 500 is connected to the energy storage cabinet 100 and the rectifier module 400; the charging pile 600 is connected to the charging host 500 and is used to charge the new energy vehicle 200.

[0070] It should be noted that the charging host 500 can receive supplemental power from at least one of the energy storage cabinet 100 and the rectifier module 400. One charging host 500 can be connected to one or more charging piles 600 to provide power to the charging piles 600.

[0071] In summary, the above charging and discharging system 1000 can supply power to the charging host 500 through the power grid and the energy storage cabinet 100 at the same time. The charging host 500 is connected with a plurality of charging piles 600, which are used to supercharge and fast charge the new energy vehicles 200. The energy storage cabinet 100 can be charged by the power grid or the new energy vehicles 200. The charging and discharging system 1000 can be put in a 4S store. There are many new energy vehicles 200 in the 4S store that need to be calibrated in capacity. The ordinary calibration method is to directly discharge the battery pack power of the new energy vehicles 200, which causes waste of resources. The charging and discharging system 1000 can directly discharge the new energy vehicles 200 in the 4S store to the energy storage cabinet for calibration capacity, recycle the power for secondary use, and be green and energy-saving. In addition, when the power grid has no time to charge the energy storage cabinet 100 or the electricity price is at the peak, the new energy vehicles 200 can be used to charge the energy storage cabinet 100, which solves the problem of insufficient power supply of the power grid and reduces the power consumption cost.

[0072] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0073] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0074] The embodiments, implementation manners and related technical features of the present application can be combined, replaced with each other without conflict.

[0075] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application, without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. An energy storage cabinet, characterized by, The energy storage cabinet comprises an energy storage module and an energy conversion module; The energy storage module comprises: an energy storage battery pack connected with the energy conversion module; an energy storage management unit connected with the energy storage battery pack and the energy conversion module; The energy conversion module comprises: a direct current conversion unit connected with the energy storage battery pack, for realizing energy conversion and transmission between the energy storage battery pack and a power battery pack of a new energy vehicle; a communication unit connected with the energy storage management unit, for realizing communication between the energy storage management unit and a battery management unit of the new energy vehicle.

2. The energy storage cabinet of claim 1, wherein, The energy conversion module further comprises a charging gun, one end of the charging gun being connected with the direct current conversion unit, and the other end of the charging gun being used for connecting a charging and discharging interface of the new energy vehicle.

3. The energy storage cabinet of claim 2, wherein, The energy conversion module further comprises: a temperature detection unit for detecting real-time temperature of at least one of the direct current conversion unit and the charging gun; a power matching unit connected with the temperature detection unit, the direct current conversion unit and the communication unit, for adjusting charging power between the energy storage battery pack and the power battery pack according to the real-time temperature and a charging strategy.

4. The energy storage cabinet of claim 3, wherein, If the real-time temperature is greater than or equal to a preset temperature, the power matching unit controls the direct current conversion unit to reduce at least one of charging voltage and charging current according to the charging strategy; If the real-time temperature is less than the preset temperature, the power matching unit controls the direct current conversion unit to increase at least one of charging voltage and charging current according to the charging strategy.

5. The energy storage cabinet of claim 3, wherein, The power matching unit determines the charging power according to the real-time temperature and the charging strategy, and transmits the charging power to at least one of the energy storage management unit and the battery management unit through the communication unit, so as to control at least one of charging voltage and charging current through at least one of the energy storage management unit and the battery management unit.

6. The energy storage cabinet of claim 3, wherein, The temperature detection unit is connected with the communication unit, so as to transmit the real-time temperature to at least one of the energy storage management unit and the battery management unit.

7. The energy storage cabinet of any of claims 1-6, wherein, During charging of the new energy vehicle to the energy storage module, when a state of charge of the energy storage module reaches a preset value, the new energy vehicle stops charging the energy storage module.

8. A charge-discharge system characterized by comprising: The charging and discharging system comprises the energy storage cabinet and the new energy vehicle.

9. The charge and discharge system according to claim 8, characterized by The charging and discharging system further comprises: a box-type substation for accessing alternating current; a rectification module connected between the box-type substation and the energy storage cabinet.

10. The charge and discharge system according to claim 9, wherein The charging and discharging system further comprises: a charging host connected with the energy storage cabinet and the rectification module; a charging pile connected with the charging host, the charging pile being used for charging the new energy vehicle.

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