Energy storage power supply device, energy storage power supply control method, device and single chip microcomputer

Abstract

The present application relates to an energy storage power supply device, a control method, a control device and a single-chip computer. The device includes: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems, wherein the energy management unit is connected to an external power grid to obtain the current power demand and output the current power demand to the battery control unit. The battery control unit is used to obtain battery information from each battery system, and determine the control signal for each battery system based on the current power demand and the battery information of each battery system, and output the control signal for the battery system to the bidirectional power converter electrically connected to the battery system. The bidirectional power converter is used to control the charging current or discharging current of the battery system electrically connected to the bidirectional power converter according to the received control signal. The use of this method can make full use of the battery capacity of each battery system.

Description

Technical Field

[0001] The present application relates to the field of battery recycling technology, and in particular to an energy storage power supply device, an energy storage power supply control method, a device and a single-chip microcomputer. Background Art

[0002] With the development of new energy vehicles, the output of power batteries is also growing continuously. The cyclic charge and discharge of power battery packs causes their available capacity to gradually decay. Generally, when the available capacity of power battery packs used in the automotive field decays to 20% of the original, it can be considered to have reached the retirement conditions. The replacement cycle of automotive power battery packs is about 4-5 years, and the corresponding annual retirement rate of power battery packs exceeds 20%. Therefore, a large number of retired batteries are generated every year. Therefore, retired battery recycling technology has emerged.

[0003] The related art adopts a recycling method of directly dismantling the retired battery system and recovering its battery materials. However, this method only recovers the battery materials, which not only consumes a lot of energy, but also wastes the potential utilization value of the retired battery system. Summary of the invention

[0004] Based on this, it is necessary to provide an energy storage power supply device, energy storage power supply control method, device and single-chip computer that are compatible with multiple retired battery systems, enable each battery system to complete charging or discharging at the same time, and fully utilize the available battery capacity of the battery system in view of the fact that retired batteries have a wide range of sources, many types and inconsistent parameters.

[0005] In a first aspect, the present application provides an energy storage power supply device. The device comprises: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems, wherein N is a positive integer;

[0006] The energy management unit is connected to the external power grid to obtain the current power demand and output the current power demand to the battery control unit;

[0007] The battery control unit is used to obtain battery information from each of the battery systems, determine a control signal for each of the battery systems according to the current power demand and the battery information of each of the battery systems, and output the control signal for the battery system to a bidirectional power converter electrically connected to the battery system;

[0008] The bidirectional power converter is used to control the charging current or discharging current of the battery system electrically connected to the bidirectional power converter according to the received control signal.

[0009] In one embodiment, the device further comprises:

[0010] A power conversion system, comprising a DC end and an AC end, wherein the DC end is electrically connected to each of the bidirectional power converters through a DC bus, and the AC end is electrically connected to the external power grid;

[0011] The power conversion system is used to convert the AC power from the external power grid into DC power in a charging mode, or to convert the DC power from each battery system into AC power in a discharging mode.

[0012] In one of the embodiments, the battery system further includes a battery management system and a battery pack;

[0013] The battery management system is used to obtain battery information of the battery pack and transmit the battery information to the battery control unit.

[0014] In one embodiment, at least one of the battery type, battery capacity information, and battery voltage information of the N battery systems is different.

[0015] In a second aspect, the present application also provides an energy storage power supply control method, which is applied to a battery control unit in an energy storage power supply device, wherein the energy storage power supply device comprises: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems. The method comprises:

[0016] receiving a current power requirement sent by the energy management unit, where the current power requirement includes a discharge power requirement or a charge power requirement;

[0017] Acquire battery information of each of the battery systems, and determine a control signal for each of the battery systems according to the battery information of each of the battery systems and the current power demand;

[0018] For any of the battery systems, a control signal for the battery system is sent to a bidirectional power converter electrically connected to the battery system, so that the bidirectional power converter controls the charging current or discharging current of the battery system according to the control signal.

[0019] In one of the embodiments, the control signal of the battery system is used to indicate the charging current or discharging current of the battery system. In the charging working mode, the charging current of the battery system is negatively correlated with the state of charge of the battery system and / or the charging current of the battery system is positively correlated with the battery capacity of the battery system; in the discharging working mode, the discharging current of the battery system is positively correlated with the state of charge of the battery system and / or the battery capacity.

[0020] In one embodiment, the acquiring battery information of each of the battery systems and determining a control signal for each of the battery systems according to the battery information of each of the battery systems and the current power demand includes:

[0021] Determining the state of charge of each battery system according to the battery information of each battery system;

[0022] Determining the energy state of the energy storage power supply device according to the charge state of each of the battery systems and the battery information of each of the battery systems;

[0023] Determining a charging time or a discharging time of the energy storage power supply device according to the energy state of the energy storage power supply device, the battery information of each of the battery systems and the current power demand;

[0024] For any of the battery systems, determining a charging current or a discharging current for the battery system according to the battery information of the battery system, the charging time or the discharging time of the energy storage power supply device and the state of charge of the battery system;

[0025] A control signal for each of the battery systems is obtained according to the charging current or discharging current for each of the battery systems and the working mode of the energy storage power supply device.

[0026] In one embodiment, determining the energy state of the energy storage power supply device according to the charge state of each battery system and the battery information of each battery system includes:

[0027] Determining the remaining power of the energy storage power supply device according to the state of charge and battery information of each battery system;

[0028] Determining the rated power of the energy storage power supply device according to the battery information of each of the battery systems;

[0029] The energy state of the energy storage power supply device is determined according to the remaining electric energy and the rated electric energy.

[0030] In a third aspect, the present application further provides an energy storage power supply control device, which is applied to a battery control unit in an energy storage power supply device, wherein the energy storage power supply device comprises: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems, including:

[0031] A receiving module, used to receive a current power requirement sent by the energy management unit, where the current power requirement includes a discharge power requirement or a charge power requirement;

[0032] A determination module, used to obtain battery information of each of the battery systems, and determine a control signal for each of the battery systems according to the battery information of each of the battery systems and the current power demand;

[0033] A sending module is used to send a control signal for any of the battery systems to a bidirectional power converter electrically connected to the battery system, so that the bidirectional power converter controls the charging current or discharging current of the battery system according to the control signal.

[0034] In one embodiment, the control signal of the battery system is used to indicate the charging current or discharging current of the battery system. In the charging working mode, the charging current of the battery system is negatively correlated with the state of charge of the battery system, and the charging current of the battery system is positively correlated with the battery capacity of the battery system; in the discharging working mode, the charging current of the battery system is positively correlated with the state of charge and / or battery capacity of the battery system.

[0035] In one embodiment, the determining module is further configured to:

[0036] Determining the state of charge of each battery system according to the battery information of each battery system;

[0037] Determining the energy state of the energy storage power supply device according to the charge state of each of the battery systems and the battery information of each of the battery systems;

[0038] Determining a charging time or a discharging time of the energy storage power supply device according to the energy state of the energy storage power supply device, the battery information of each of the battery systems and the current power demand;

[0039] For any of the battery systems, determining a charging current or a discharging current for the battery system according to the battery information of the battery system, the charging time or the discharging time of the energy storage power supply device and the state of charge of the battery system;

[0040] A control signal for each of the battery systems is obtained according to the charging current or discharging current for each of the battery systems and the working mode of the energy storage power supply device.

[0041] In one embodiment, the determining module is further configured to:

[0042] Determining the remaining power of the energy storage power supply device according to the state of charge and battery information of each battery system;

[0043] Determining the rated power of the energy storage power supply device according to the battery information of each of the battery systems;

[0044] The energy state of the energy storage power supply device is determined according to the remaining electric energy and the rated electric energy.

[0045] In a fourth aspect, the present application further provides a single-chip microcomputer. The single-chip microcomputer includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0046] receiving a current power requirement sent by the energy management unit, where the current power requirement includes a discharge power requirement or a charge power requirement;

[0047] Acquire battery information of each of the battery systems, and determine a control signal for each of the battery systems according to the battery information of each of the battery systems and the current power demand;

[0048] For any of the battery systems, a control signal for the battery system is sent to a bidirectional power converter electrically connected to the battery system, so that the bidirectional power converter controls the charging current or discharging current of the battery system according to the control signal.

[0049] The energy storage power supply device, energy storage power supply control method, device and single-chip computer described in the embodiments of the present application, the device includes: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems, wherein the energy management unit is connected to the external power grid to obtain the current power demand and output the current power demand to the battery control unit. The battery control unit is used to obtain battery information from each battery system, and determine the control signal for each battery system based on the current power demand and the battery information of each battery system, and output the control signal for the battery system to the bidirectional power converter electrically connected to the battery system. The bidirectional power converter is used to control the charging current or discharging current of the battery system electrically connected to the bidirectional power converter according to the received control signal. Based on the energy storage power supply device, energy storage power supply control method, device and single-chip computer provided in the embodiments of the present application, the battery control unit can control the charging current or discharging current of each battery system through a bidirectional power converter according to the current power demand, so that each battery system can be fully charged or discharged synchronously under the control of the battery control unit. Therefore, in the scenario of recycling retired battery systems, the potential utilization value of the battery system and the battery capacity of each battery system can be fully utilized through the energy storage power supply device without disassembling the battery system, and overcharging or over-discharging of some battery systems in the energy storage power supply device can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of the structure of the energy storage power supply device provided in an embodiment of the present application;

[0051] Figure 2 A schematic diagram of a flow chart of an energy storage power supply control method provided in an embodiment of the present application;

[0052] Figure 3 A schematic flow chart of an energy storage power supply control method provided in another embodiment of the present application;

[0053] Figure 4 A schematic flow chart of an energy storage power supply control method provided in another embodiment of the present application;

[0054] Figure 5 A structural block diagram of an energy storage power supply control device provided in one embodiment of the present application;

[0055] Figure 6 This is a diagram of the internal structure of a single-chip microcomputer provided in one embodiment of the present application.

[0056] Description of Figure Numbers

[0057] Energy storage power supply device 10 , energy management unit 100 , battery control unit 200 , battery system 300 , bidirectional power converter 400 , power conversion system 500 , battery management system 3002 , battery pack 3004 . DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0059] Reference Figure 1 As shown, an embodiment of the present application provides an energy storage power supply device, which includes: an energy management unit 100, a battery control unit 200, N battery systems 300, and N bidirectional power converters 400 electrically connected to each battery system 300, wherein N is a positive integer;

[0060] The energy management unit 100 is connected to the external power grid to obtain the current power demand and output the current power demand to the battery control unit 200;

[0061] The battery control unit 200 is used to obtain battery information from each battery system 300, and determine a control signal for each battery system 300 according to the current power demand and the battery information of each battery system, and output the control signal for the battery system 300 to the bidirectional power converter 400 electrically connected to the battery system 300;

[0062] The bidirectional power converter 400 is used to control the charging current or discharging current of the battery system 300 electrically connected to the bidirectional power converter 400 according to the received control signal.

[0063] In an embodiment of the present application, the energy storage power supply device includes an energy management unit 100, a battery control unit 200, N battery systems 300, and N bidirectional power converters 400 electrically connected to each battery system 300. Among them, the N battery systems 300 form a new power supply, which can discharge outward to supply power to a load electrically connected to the power supply, and the power supply can also be charged by an external power grid electrically connected to it to store electricity for itself. The N battery systems 300 correspond one-to-one to the N bidirectional power converters 400, and one battery system 300 is electrically connected to the corresponding bidirectional power converter 400. For example: refer to Figure 1 As shown, the three battery systems are connected to the three bidirectional power converters one by one, battery system 1 is electrically connected to bidirectional power converter 1, battery system 2 is electrically connected to bidirectional power converter 2, and battery system 3 is electrically connected to bidirectional power converter 3.

[0064] Exemplarily, the N battery systems 300 may all be ordinary battery systems, or may all be retired battery systems, or may be a combination of some ordinary battery systems and some retired battery systems. In the embodiments of the present application, the types of the N battery systems 300 are not specifically limited. For retired battery systems, since the available capacity of the battery system's electricity will gradually decay with the cyclic charge and discharge of the battery system, when the available capacity of the battery system decays to a certain extent, the battery system is deemed to have reached the retirement condition, and the battery system that reaches the retirement condition is a retired battery system. For example: When the available capacity of a power battery system used in a new energy vehicle decays to 20% of the original available capacity, the power battery system has reached the retirement condition, and therefore, the power battery system is a retired battery system.

[0065] In the embodiment of the present application, the energy management unit 100 is connected to the external power grid to obtain the current power demand and output the current power demand to the battery control unit 200. The energy management unit 100 is connected to the battery control unit 200 in a communication manner so that data and signals can be transmitted between the energy management unit 100 and the battery control unit 200. It should be noted that the communication connection method is not specifically limited in the embodiment of the present application. For example, the energy management unit 100 can be connected to the battery control unit 200 in a communication manner via CAN1 (Controller Area Network, communication bus).

[0066] Among them, the current power demand can be a charging power demand or a discharging power demand. The current power demand is correlated with the working state of the external power grid. For example, when the external power grid is heavily loaded or in a peak electricity price period, the energy storage power supply device outputs electric energy to the grid, and accordingly, the current power demand is a discharging power demand; when the external power grid is lightly loaded or in a valley electricity price period, the grid outputs electric energy to the energy storage power supply device, and accordingly, the current power demand is a charging power demand.

[0067] In an embodiment of the present application, in order to fully charge or discharge each battery system at the same time, the battery control unit 200 can obtain battery information from each battery system 300, and determine a control signal for each battery system 300 based on the current power demand and the battery information of each battery system, and output the control signal for the battery system 300 to the bidirectional power converter 400 electrically connected to the battery system 300, so that the bidirectional power converter 400 can control the charging or discharging of the corresponding battery system 300 according to the control signal, so that each battery system can be fully charged or discharged at the same time.

[0068] Exemplarily, still taking the above example, in the charging mode, the battery control unit 200 obtains the battery information of battery system 1, battery system 2 and battery 3, and determines the control signal 1 for battery system 1, determines the control signal 2 for battery system 2, determines the control signal 3 for battery system 3 according to the charging power requirement and the battery information of battery system 1, battery system 2 and battery system 3, and outputs the control signal 1 to the bidirectional power converter 1, outputs the control signal 2 to the bidirectional power converter 2, and outputs the control signal 3 to the bidirectional power converter 3. The bidirectional power converter 1 controls the charging current of the battery system 1 according to the received control signal 1, the bidirectional power converter 2 controls the charging current of the battery system 2 according to the received control signal 2, and the bidirectional power converter 3 controls the charging current of the battery system 3 according to the received control signal 3, so that the battery system 1, the battery system 2 and the battery system 3 are fully charged at the same time.

[0069] The battery control unit 200 is connected to each battery system 300. It should be noted that the communication connection method is not specifically limited in the embodiment of the present application. For example, the battery control unit 200 can be connected to each battery system 300 via a CAN (Controller Area Network, communication bus).

[0070] The battery information may include but is not limited to: the rated capacity, voltage, and real-time current of the battery system.

[0071] In an embodiment of the present application, the battery control unit 200 can determine the charging current or discharging current for each battery system 300 based on the current power demand and the battery information of each battery system, and then determine the charging control signal or discharging control signal for each battery system 300 based on the charging current or discharging current for each battery system 300, and output the charging control signal or discharging control signal for each battery system 300 to the bidirectional power converter 400 electrically connected to the battery system 300, so that the bidirectional power converter 400 controls the charging current or discharging current of each battery system 300 according to the charging control signal or discharging control signal of each battery system 300.

[0072] Exemplarily, taking the current power demand as the charging power demand, the battery control unit 200 can determine the charging current of each battery system 300 according to the charging power demand and the battery information of each battery system. Afterwards, the battery control unit 200 determines the charging control signal for each battery system 300 according to the charging current of each battery system 300, and outputs the charging control signal for each battery system 300 to the bidirectional power converter 400 electrically connected to the battery system 300, so that the bidirectional power converter 400 controls the charging current of each battery system 300 to achieve full charging of each battery system 300 at the same time.

[0073] In the embodiment of the present application, the bidirectional power converter 400 controls the charging current or discharging current of the battery system 300 electrically connected to the bidirectional power converter 400 according to the received control signal. The low voltage end of the bidirectional power converter 400 is electrically connected to the battery system 300, and the high voltage end of the bidirectional power converter 400 is electrically connected to the external power grid.

[0074] For example, the bidirectional power converter 400 determines its own working mode according to the received control signal, and the working mode can be divided into a buck mode or a boost mode according to charging or discharging. At the same time, the bidirectional power converter 400 can control its own output current or input current according to the received control signal, thereby controlling the charging current or discharging current of each battery system 300. Figure 1 Taking the bidirectional power converter 1 in the example, the battery control unit determines that the charging current of the battery system 1 is 10A, then the bidirectional power converter 1 can control its own output current according to the received control signal, so that the charging current of the battery system 1 remains at 10A; or, the battery control unit determines that the discharge current of the battery system 1 is 15A, then the bidirectional power converter 1 can control its own input current according to the received control signal, so that the discharge current of the battery system 1 remains at 15A.

[0075] Exemplarily, still taking the above example, when the current power demand is a charging power demand, the bidirectional power converter 400 determines that its own working mode is a buck mode according to the received charging control signal, and at the same time, the bidirectional power converter controls its own output current according to the charging control signal, thereby controlling the charging current of each battery system 300; or, when the current power demand is a discharging power demand, the bidirectional power converter 400 determines that its own working mode is a boost mode according to the received discharging control signal, and at the same time, the bidirectional power converter 400 controls its own input current according to the discharging control signal, thereby controlling the discharge current of each battery system 300.

[0076] The energy storage power supply device described in the embodiment of the present application includes: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems, wherein the energy management unit is connected to the external power grid to obtain the current power demand and output the current power demand to the battery control unit. The battery control unit is used to obtain battery information from each battery system, and determine the control signal for each battery system based on the current power demand and the battery information of each battery system, and output the control signal for the battery system to the bidirectional power converter electrically connected to the battery system. The bidirectional power converter is used to control the charging current or discharging current of the battery system electrically connected to the bidirectional power converter according to the received control signal. Based on the energy storage power supply device provided in the embodiment of the present application, the battery control unit can control the charging current or discharging current of each battery system respectively through the bidirectional power converter according to the current power demand, so that each battery system can be fully charged or discharged synchronously under the control of the battery control unit. Therefore, in the scenario of recycling retired battery systems, the potential utilization value of the battery system and the battery capacity of each battery system can be fully utilized through the energy storage power supply device without disassembling the battery system, and overcharging or over-discharging of some battery systems in the energy storage power supply device can be avoided.

[0077] In one embodiment, referring to Figure 1 As shown, the energy storage power supply device also includes:

[0078] The power conversion system 500 includes a DC end and an AC end, wherein the DC end is electrically connected to each bidirectional power converter 400 via a DC bus, and the AC end is electrically connected to an external power grid;

[0079] The power conversion system 500 is used to convert the AC power from the external power grid into DC power in the charging mode, or to convert the DC power from each battery system 300 into AC power in the discharging mode.

[0080] In the embodiment of the present application, the high-voltage ends of each bidirectional power converter 400 are connected in parallel to form a DC bus. The DC end of the power conversion system 500 is electrically connected to each bidirectional power converter 400 by connecting to the DC bus, and the AC end is connected to the external power grid.

[0081] Each battery system 300 contains direct current, while the external power grid contains alternating current. The power conversion system 500 is connected between the battery system and the external power grid to realize the conversion between alternating current and direct current.

[0082] In an embodiment of the present application, in a charging mode, the power conversion system 500 converts the alternating current (AC) from the external power grid into direct current (DC), and the DC enters each bidirectional power converter 400 and the battery system 300 electrically connected to the bidirectional power converter 400 in turn. The bidirectional power converter 400 controls the DC to charge each battery system 300 according to a control signal for each battery system 300, thereby controlling the charging current of each battery system 300. In a discharging mode, each battery system 300 discharges DC, and the bidirectional power converter 400 electrically connected to the battery system 300 controls the DC current to enter the bidirectional power converter 400 according to a control signal for each battery system 300, thereby controlling the discharge current of each battery system 300. The power conversion system 500 converts the DC from each battery system 300 into AC.

[0083] In the embodiment of the present application, the power conversion system 500 can complete the mutual conversion between AC power and DC power in the charging mode or the discharging mode, so that the energy storage power supply device can be applied to the AC power grid, thereby increasing its scope of use.

[0084] In one embodiment, referring to Figure 1 As shown, the battery system further includes a battery management system 3002 and a battery pack 3004;

[0085] The battery management system 3002 is used to obtain battery information of the battery pack 3004 and transmit the battery information to the battery control unit 200 .

[0086] In an embodiment of the present application, the battery system obtains the battery information of the battery pack 3004 through the battery management system 3002 (Battery Management System, BMS), and reports it to the battery control unit 200, wherein the battery information may include information such as rated capacity, voltage and real-time current. The battery management system 3002 can monitor and obtain the battery information of the battery pack 3004 in real time. In addition, part of the battery information of the battery pack 3004 has been determined after the battery pack 3004 is manufactured, which is the preset information of the battery pack 3004, such as the rated capacity and other information. Therefore, the battery management system 3002 can also obtain the battery information by reading the preset information. For example: the battery management system 3002 obtains the battery information such as the voltage and real-time current of the battery pack 3004 by monitoring, and obtains the battery information such as the rated capacity of the battery pack 3004 by directly reading.

[0087] In the case where the battery system is a retired battery system, the embodiment of the present application can utilize N retired battery systems to form a new energy storage power supply device, and the retired battery system can be recycled and reused without disassembling the retired battery system.

[0088] In the embodiment of the present application, the battery management system 3002 is used to obtain battery information of the battery pack 3004 and transmit the battery information to the battery control unit 200. By using the battery management system 3002 in the battery system to obtain battery information, when the battery system is a retired battery system, the retired battery system can be directly used without disassembling the retired battery system, thus saving manpower and material resources required for disassembling the battery system.

[0089] In one embodiment, at least one of the battery type, battery capacity information, and battery voltage information of the N battery systems 300 is different.

[0090] In the embodiment of the present application, at least one of the battery type, battery capacity information, and battery voltage information of the N battery systems 300 is different. For example, still taking the current example as an example, the battery type of battery system 1 is lithium iron phosphate battery, the battery capacity is 150Ah, and the battery voltage platform is 336V; the battery type of battery system 2 is ternary lithium battery, the battery capacity is 150Ah, and the battery voltage platform is 360V; the battery type of battery system 3 is ternary lithium battery, the battery capacity is 100Ah, and the battery voltage platform is 540V.

[0091] In the embodiment of the present application, since the battery control unit 200 can determine the charging current or discharging current of each battery system 300 according to the current power demand, and respectively control the charging current or discharging current of each battery system 300 through the bidirectional power converter 400, each battery system can be fully charged or fully discharged synchronously. Therefore, the N battery systems 300 can be different battery systems, and the energy storage power supply device has high compatibility.

[0092] In one embodiment, the battery types, battery capacity information, and battery voltage information of the N battery systems 300 may all be the same.

[0093] Reference Figure 2 As shown, an embodiment of the present application provides an energy storage power supply control method, which is applied to a battery control unit in an energy storage power supply device. The energy storage power supply device includes: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each battery system. The method includes:

[0094] Step 202: Receive a current power requirement sent by an energy management unit, where the current power requirement includes a discharge power requirement or a charge power requirement.

[0095] In the embodiment of the present application, the current power demand is correlated with the working state of the external power grid. For example, when the load of the external power grid is large or is in a peak electricity price period, the energy storage power supply device outputs electric energy to the grid, and accordingly, the current power demand is the discharge power demand; when the load of the external power grid is small or is in a low electricity price period, the grid outputs electric energy to the energy storage power supply device, and accordingly, the current power demand is the charging power demand.

[0096] Step 204 , obtaining battery information of each battery system, and determining a control signal for each battery system according to the battery information and current power demand of each battery system.

[0097] In the embodiment of the present application, the battery information includes information such as the rated capacity, voltage, and real-time current of the battery system. The battery control unit obtains the rated capacity, voltage, and real-time current of each battery system, and determines the charging current or discharging current of each battery system according to the rated capacity, voltage, real-time current, and current power demand of each battery system, and determines the charging control signal or discharging control signal for each battery system according to the charging current or discharging current of each battery system, thereby controlling the charging current or discharging current of each battery system. The specific process can be referred to the relevant description of the aforementioned embodiment, and the embodiment of the present application will not be repeated here.

[0098] Step 206, for any battery system, sending a control signal for the battery system to a bidirectional power converter electrically connected to the battery system, so that the bidirectional power converter controls the charging current or discharging current of the battery system according to the control signal.

[0099] In an embodiment of the present application, for any battery system, the battery control unit sends a control signal for the battery system to a bidirectional power converter electrically connected to the battery system. The bidirectional power converter determines its own operating mode based on the control signal. At the same time, the bidirectional power converter controls its own output current or input current based on the control signal, thereby controlling the charging current or discharging current of the battery system.

[0100] Exemplarily, still taking the above example, when the current power demand is the charging power demand, bidirectional power converter 1, bidirectional power converter 2, and bidirectional power converter 3 respectively determine that their own working mode is the buck mode according to the received charging control signal. At the same time, bidirectional power converter 1, bidirectional power converter 2, and bidirectional power converter 3 respectively control their own output current to the battery system according to the charging control signal, thereby controlling the charging current of battery system 1, battery system 2, and battery system 3 respectively.

[0101] In an embodiment of the present application, the battery control unit can control the charging current or discharging current of each battery system through a bidirectional power converter according to the current power demand, so that each battery system can be fully charged or discharged synchronously under the control of the battery control unit. In this way, in the scenario of recycling retired battery systems, the potential utilization value of the battery system and the battery capacity of each battery system can be fully utilized through the energy storage power supply device without disassembling the battery system, and overcharging or over-discharging of some battery systems in the energy storage power supply device can be avoided.

[0102] In one embodiment, the control signal of the battery system is used to indicate the charging current or discharging current of the battery system. In the charging working mode, the charging current of the battery system is negatively correlated with the state of charge of the battery system and / or the charging current of the battery system is positively correlated with the battery capacity of the battery system; in the discharging working mode, the discharging current of the battery system is positively correlated with the state of charge of the battery system and / or the battery capacity.

[0103] In the embodiment of the present application, the state of charge is a form of expression of the real-time stored electricity in the battery system, and the battery capacity is the maximum amount of electricity that the battery system can store. To ensure that each battery system can complete charging or discharging at the same time, the charging current or discharging current of each battery system is correlated with the state of charge and battery capacity of each battery system. In the charging working mode, the higher the state of charge of the battery system, the smaller the charging current of the battery system; the smaller the battery capacity of the battery system, the smaller the charging current of the battery system. In the discharge mode, the higher the state of charge of the battery system, the greater the discharge current of the battery system; the larger the battery capacity of the battery system, the greater the discharge current of the battery system.

[0104] In an embodiment of the present application, the battery control unit can determine the size of the charging current or discharging current of each battery system based on the correlation between the charging current or discharging current of each battery system and the charge state and battery capacity information of the battery system. Thereafter, a control signal for each battery system is determined based on the charging current or discharging current of each battery system. The bidirectional power converter controls the charging current or discharging current of each battery system based on the control signal for each battery system, so that each battery system can be fully charged synchronously, or each battery system can be fully discharged synchronously, thereby making full use of the battery capacity of each battery system and avoiding overcharging or over-discharging of some battery systems.

[0105] In one embodiment, referring to Figure 3 As shown, in step 204, the battery information of each battery system is obtained, and the control signal for each battery system is determined according to the battery information and the current power demand of each battery system, including:

[0106] Step 302 : determining the state of charge of each battery system according to the battery information of each battery system.

[0107] In the embodiment of the present application, the battery control unit can determine the state of charge of each battery system according to the real-time current and rated capacity of each battery system. For example, the state of charge of each battery system can be determined by using the ampere-hour measurement method according to the real-time current and rated capacity of each battery system.

[0108] Step 304: Determine the energy state of the energy storage power supply device according to the charge state of each battery system and the battery information of each battery system.

[0109] In the embodiment of the present application, the energy state of the energy storage power supply device is a representation of the amount of electricity stored in the energy storage power supply device in real time. The battery control unit can determine the energy state of the energy storage power supply device according to the state of charge of each battery system and the rated capacity and voltage of each battery system.

[0110] Exemplarily, the process of determining the state of energy (SOE) of the energy storage power supply device can refer to the following formula (1).

[0111]

[0112] Wherein, SOE represents the energy state of the energy storage power supply device, n represents the number of battery systems in the energy storage power supply device (n=N in the embodiment of the present application), i represents the i-th battery system in the energy storage power supply device, and SOC i represents the state of charge of the ith battery system, Q i represents the rated capacity of the ith battery system, U i represents the voltage of the i-th battery system.

[0113] Step 306: Determine the charging time or discharging time of the energy storage power supply device according to the energy state of the energy storage power supply device, the battery information of each battery system and the current power demand.

[0114] In an embodiment of the present application, the battery control unit can determine the charging time of the energy storage power supply device based on the energy state of the energy storage power supply device, the rated capacity of each battery system, the voltage of each battery system, and the charging power requirement; or can determine the discharge time of the energy storage power supply device based on the energy state of the energy storage power supply device, the rated capacity of each battery system, the voltage of each battery system, and the discharge power requirement.

[0115] Exemplarily, in the charging mode, the energy state of the energy storage power supply device that needs to be charged can be obtained according to the energy state of the energy storage power supply device, the electric energy that the energy storage power supply device needs to be charged can be determined according to the energy state of the energy storage power supply device that needs to be charged and the rated electric energy of the energy storage power supply device, and the charging time of the energy storage power supply device can be determined according to the electric energy that the energy storage power supply device needs to be charged and the charging power requirement. Exemplarily, the process of determining the charging time t1 of the energy storage power supply device can refer to the following formula (II).

[0116]

[0117] Among them, 1-SOE represents the energy state that the energy storage power supply device needs to be charged. It indicates the electric energy that the energy storage power supply device needs to charge, and P1 indicates the charging power requirement.

[0118] In the discharge mode, first, the discharge power of the energy storage power supply device is determined according to the energy state of the energy storage power supply device and the rated power of the energy storage power supply device, and the discharge time of the energy storage power supply device is determined according to the discharge power of the energy storage power supply device and the discharge power requirement. Exemplarily, the process of determining the discharge time t2 of the energy storage power supply device can refer to the following formula (III).

[0119]

[0120] in, P represents the discharge energy of the energy storage power supply device, and P2 represents the discharge power requirement.

[0121] Step 308, for any battery system, determine the charging current or discharging current for the battery system according to the battery information of the battery system, the charging time or discharging time of the energy storage power supply device and the charge state of the battery system.

[0122] In an embodiment of the present application, for any battery system, the battery control unit determines the charging current or discharging current for the battery system according to the rated capacity of the battery system, the charging time or discharging time of the energy storage power supply device and the charge state of the battery system.

[0123] In the charging mode, firstly, the energy state that the battery system needs to be charged is determined according to the state of charge of the battery system, then the charging capacity of the battery system is determined according to the energy state that the battery system needs to be charged and the rated capacity of the battery system, and the charging current of each battery system is determined according to the charging capacity of the battery system and the charging time of the energy storage power supply device. Exemplarily, the charging current I of each battery system is determined ci The process can refer to the following formula (IV).

[0124]

[0125] Among them, SOC i Represents the state of charge of the i-th battery system, 1-SOC i Indicates the energy state that the i-th battery system needs to be charged, (1-SOC i )·Q i represents the charging capacity of the i-th battery system, and t1 is the charging time of the energy storage power supply device.

[0126] In the discharge mode, the discharge capacity of the battery system is first determined according to the state of charge of the battery system and the rated capacity of the battery system, and the discharge current of each battery system is determined according to the discharge capacity of the battery system and the discharge time of the energy storage power supply device. For example, the discharge current I of each battery system is determined di The process can refer to the following formula (5):

[0127]

[0128] Among them, SOC i Q i represents the discharge capacity of the i-th battery system, and t2 is the discharge time of the energy storage power supply device.

[0129] Step 310 , obtaining a control signal for each battery system according to the charging current or discharging current for each battery system and the working mode of the energy storage power supply device.

[0130] In an embodiment of the present application, the battery control unit obtains a control signal for each battery system according to the charging current or discharging current for each battery system and the working mode of the energy storage power supply device. The working mode of the energy storage power supply device is a charging mode or a discharging mode, and the control signal for each battery system is a charging control signal or a discharging control signal. The charging control signal for each battery system is used to control the charging current of each battery system, and the discharging control signal for each battery system is used to control the discharging current of each battery system.

[0131] In an embodiment of the present application, the battery control unit can determine the charging current or discharging current of each battery system based on the battery information and current power demand of each battery system, and determine the control signal for each battery system based on the charging current or discharging current of each battery system. The charging current or discharging current of each battery system is controlled by the bidirectional power converter according to the control signal for each battery system, so that each battery system can be fully charged synchronously, or each battery system can be fully discharged synchronously, thereby making full use of the battery capacity of each battery system and avoiding overcharging or over-discharging of some battery systems.

[0132] In one embodiment, referring to Figure 4 As shown, in step 304, the energy state of the energy storage power supply device is determined according to the charge state of each battery system and the battery information of each battery system, including:

[0133] Step 402, determining the remaining power of the energy storage power supply device according to the state of charge of each battery system and the battery information.

[0134] In the embodiment of the present application, the battery control unit determines the remaining power of the energy storage power supply device according to the state of charge, rated capacity and voltage of each battery system. First, for each battery system, the remaining power in the battery system is determined according to the state of charge, rated capacity and voltage of the battery system (as shown in formula (1), the remaining power in the battery system can be expressed as SOC i Q i ·U i ), then the remaining power of each battery system is added together to obtain the remaining power of the energy storage power supply device (as shown in formula (1), the remaining power of the energy storage power supply device can be expressed as

[0135] Step 404: Determine the rated power of the energy storage power supply device according to the battery information of each battery system.

[0136] In the embodiment of the present application, the battery control unit determines the rated power of the energy storage power supply device according to the battery information of each battery system. First, for each battery system, the rated power of the battery system is determined according to the rated capacity and voltage of the battery system (as shown in formula (1), the rated power of the battery system can be expressed as Q i ·U i ), then the rated power of each battery system is added together to obtain the rated power of the energy storage power supply device (as shown in formula (1), the remaining power of the energy storage power supply device can be expressed as ).

[0137] Step 406, determining the energy state of the energy storage power supply device according to the remaining power and the rated power.

[0138] In the embodiment of the present application, the energy state of the energy storage power supply device can be determined according to the ratio of the residual power to the rated power. For example, the residual power of the energy storage power supply device can be divided by the rated power of the energy storage power supply device to obtain the energy state of the energy storage power supply device.

[0139] In the embodiment of the present application, the battery control unit can determine the energy state of the energy storage power supply device according to the charge state and battery information of each battery system, and determine the charging current or discharging current of each battery system according to the energy state of the energy storage power supply device, the battery information of each battery system and the current power demand, and control the charging current or discharging current of each battery system through the bidirectional power converter according to the charging current or discharging current of each battery system, so that each battery system can be fully charged or discharged synchronously under the control of the battery control unit, so that in the scenario of recycling retired battery systems, the potential utilization value of the battery system and the battery capacity of each battery system can be fully utilized through the energy storage power supply device without disassembling the battery system, and overcharging or over-discharging of some battery systems in the energy storage power supply device can be avoided.

[0140] In order to enable those skilled in the art to better understand the embodiments of the present application, the embodiments of the present application are described below through specific examples.

[0141] For example, refer to Figure 1As shown, the energy storage power supply device 10 includes a battery system 1, a battery system 2 and a battery system 3. When the external power grid is heavily loaded or is in a peak electricity price period, the energy storage power supply device outputs electric energy to the power grid. At this time, the energy management unit 100 obtains the current power demand as the discharge power demand according to the power consumption status of the external power grid. Afterwards, the energy management unit 100 transmits the discharge power demand to the battery control unit 200. At the same time, the battery control unit 200 obtains the rated capacity, voltage and real-time current of the battery pack 3004 of the battery system 1, the battery system 2 and the battery system 3 respectively from the battery management system 3002 of the battery system 1, the battery system 2 and the battery system 3.

[0142] The battery control unit 200 determines the state of charge of the battery system 1, the battery system 2 and the battery system 3 according to the rated capacity and real-time current of each battery system, and then determines the remaining power of the energy storage power supply device 10 according to the state of charge, rated capacity and voltage of the battery system 1, the battery system 2 and the battery system 3, and determines the rated power of the energy storage power supply device 10 according to the rated capacity and voltage of the battery system 1, the battery system 2 and the battery system 3, and then divides the remaining power by the rated power to obtain the energy state of the energy storage power supply device. The battery control unit 200 determines the discharge power of the energy storage power supply device according to the energy state of the energy storage power supply device, the rated capacity of each battery system and the voltage of each battery system, and determines the discharge time of the energy storage power supply device according to the discharge power and discharge power demand of the energy storage power supply device, and then determines the discharge current I1 of the battery system 1, the discharge current I2 of the battery system 2 and the discharge current I3 of the battery system 3 according to the state of charge of the battery system, the rated capacity of the battery system and the discharge time of the energy storage power supply device for each battery system.

[0143] The battery control unit 200 determines a discharge control signal 1 for battery system 1 according to the discharge current I1 of battery system 1, determines a discharge control signal 2 for battery system 2 according to the discharge current I2 of battery system 2, determines a discharge control signal 3 for battery system 3 according to the discharge current I3 of battery system 3, and outputs the discharge control signal 1 to the bidirectional power converter 1, outputs the discharge control signal 2 to the bidirectional power converter 2, and outputs the discharge control signal 3 to the bidirectional power converter 3.

[0144] Bidirectional power converter 1 determines its own working mode as boost mode according to discharge control signal 1, and controls its own input current according to discharge control signal 1, thereby controlling the discharge current of battery system 1. Bidirectional power converter 2 and bidirectional power converter 3 also control the discharge current of battery system 2 and battery system 3 according to the above steps, respectively, so that battery systems 1, 2 and 3 can be fully discharged at the same time. Power conversion system 500 converts the direct current flowing out of each battery system and flowing through each bidirectional power converter into alternating current, so that the energy storage power supply device 10 supplies power to the external power grid.

[0145] It can be seen from the above examples that the battery control unit 200 can control the discharge current of each battery system separately through the bidirectional power converter according to the current power demand, so that each battery system can be discharged synchronously under the control of the battery control unit. Therefore, in the scenario of recycling retired battery systems, the potential utilization value of the battery system and the battery capacity of each battery system can be fully utilized through the energy storage power supply device without disassembling the battery system, and overcharging or over-discharging of some battery systems in the energy storage power supply device can be avoided.

[0146] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0147] Based on the same inventive concept, the embodiment of the present application also provides an energy storage power supply control device for implementing the energy storage power supply control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more energy storage power supply control device embodiments provided below can refer to the limitations of the energy storage power supply control method above, and will not be repeated here.

[0148] Reference Figure 5As shown, an embodiment of the present application provides an energy storage power supply control device, which is applied to a battery control unit in an energy storage power supply device. The energy storage power supply device includes: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems. The energy storage power supply control device includes: a receiving module 502, a determining module 504, and a sending module 506, wherein:

[0149] A receiving module 502 is used to receive a current power demand sent by an energy management unit, where the current power demand includes a discharge power demand or a charge power demand;

[0150] A determination module 504 is used to obtain battery information of each battery system, and determine a control signal for each battery system according to the battery information and current power demand of each battery system;

[0151] The sending module 506 is used to send a control signal for any battery system to a bidirectional power converter electrically connected to the battery system, so that the bidirectional power converter controls the charging current or discharging current of the battery system according to the control signal.

[0152] The energy storage power supply control method and device described in the embodiment of the present application is applied to a battery control unit in an energy storage power supply device, wherein the energy storage power supply device includes: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems, wherein the receiving module 502 is used to receive the current power demand sent by the energy management unit. The determination module 504 is used to obtain the battery information of each battery system, and determine the control signal for each battery system based on the battery information and the current power demand of each battery system. The sending module 506 is used to send a control signal for the battery system to the bidirectional power converter electrically connected to the battery system for any battery system, so that the bidirectional power converter controls the charging current or discharging current of the battery system according to the control signal. Based on the energy storage power supply control device provided in the embodiment of the present application, the battery control unit can control the charging current or discharging current of each battery system respectively through the bidirectional power converter according to the current power demand, so that each battery system can be fully charged or discharged synchronously under the control of the battery control unit. Therefore, in the scenario of recycling retired battery systems, the potential utilization value of the battery system and the battery capacity of each battery system can be fully utilized through the energy storage power supply device without disassembling the battery system, and overcharging or over-discharging of some battery systems in the energy storage power supply device can be avoided.

[0153] In one embodiment, the control signal of the battery system is used to indicate the charging current or discharging current of the battery system. In the charging working mode, the charging current of the battery system is negatively correlated with the state of charge of the battery system, and the charging current of the battery system is positively correlated with the battery capacity of the battery system; in the discharging working mode, the charging current of the battery system is positively correlated with the state of charge and / or battery capacity of the battery system.

[0154] In one embodiment, the determination module 504 is further configured to:

[0155] Determine the state of charge of each battery system according to the battery information of each battery system;

[0156] Determine the energy state of the energy storage power supply device according to the charge state of each battery system and the battery information of each battery system;

[0157] Determine the charging time or discharging time of the energy storage power supply device according to the energy state of the energy storage power supply device, the battery information of each battery system and the current power demand;

[0158] For any battery system, determine the charging current or discharging current for the battery system according to the battery information of the battery system, the charging time or discharging time of the energy storage power supply device and the state of charge of the battery system;

[0159] A control signal for each battery system is obtained according to the charging current or discharging current for each battery system and the working mode of the energy storage power supply device.

[0160] In one embodiment, the determination module 504 is further configured to:

[0161] Determine the remaining power of the energy storage power supply device based on the charge status and battery information of each battery system;

[0162] Determine the rated power of the energy storage power supply device according to the battery information of each battery system;

[0163] The energy state of the energy storage power supply device is determined based on the remaining electrical energy and the rated electrical energy.

[0164] Each module in the above energy storage power supply control device can be implemented in whole or in part by software, hardware and a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module above.

[0165] In one embodiment, a single chip microcomputer is provided, whose internal structure diagram can be shown as follows: Figure 6As shown. The single-chip microcomputer includes a processor, a memory, and a communication interface connected through a system bus. Among them, the processor of the single-chip microcomputer is used to provide computing and control capabilities. The memory of the single-chip microcomputer includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the single-chip microcomputer is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the single-chip microcomputer is executed by the processor, a method for controlling an energy storage power supply is implemented.

[0166] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present application, and does not constitute a limitation on the single-chip microcomputer to which the scheme of the present application is applied. The specific single-chip microcomputer may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0167] In one embodiment, a single chip computer is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0168] It should be noted that the data involved in this application (including but not limited to data used for analysis, data stored, data displayed, etc.) are all data authorized by the user or fully authorized by all parties.

[0169] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0170] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0171] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An energy storage power supply device, characterized in that: The device comprises: an energy management unit (100), a battery control unit (200), N battery systems (300), and N bidirectional power converters (400) electrically connected to each of the battery systems (300), wherein N is a positive integer; The energy management unit (100) is connected to an external power grid, and is used to obtain a current power demand, and output the current power demand to the battery control unit (200); the current power demand includes a discharge power demand or a charge power demand; The battery control unit (200) is used to obtain battery information from each of the battery systems (300), determine the state of charge of each battery system based on the battery information of each battery system, and determine the energy state of the energy storage power supply device based on the state of charge of each battery system and the battery information of each battery system; the calculation formula of the energy state is: Wherein, SOE is the energy state, n is the number of the battery systems (300) in the energy storage power supply device, i represents the i-th battery system (300) in the energy storage power supply device, SOC i is the state of charge of the ith battery system (300), Q i is the rated capacity of the i-th battery system (300), U i is the voltage of the i-th battery system (300); The battery control unit (200) is further used to determine the charging time or discharging time of the energy storage power supply device according to the energy state of the energy storage power supply device, the battery information of each battery system and the current power demand; the calculation formula of the charging time is: Wherein, t1 is the charging time, P1 is the charging power requirement; the calculation formula of the discharge time is: Wherein, t2 is the discharge time, and P2 is the discharge power requirement; The battery control unit (200) is further used to determine the charging current according to the ratio of the charging capacity of each battery system (300) to the charging time when the working mode of the energy storage power supply device is the charging mode, or to determine the discharging current according to the ratio of the discharging capacity to the discharging time when the working mode is the discharging mode; the calculation formula of the charging current is: Among them, I ci is the charging current, (1-SOC i )·Q i is the charging capacity of the ith battery system (300); the calculation formula for the discharge current is: Among them, I di is the discharge current, SOC i Q i is the discharge capacity of the i-th battery system (300); The battery control unit (200) is further used to obtain a control signal for each battery system according to the charging current or discharging current for each battery system and the working mode of the energy storage power supply device, and output the control signal for the battery system (300) to a bidirectional power converter (400) electrically connected to the battery system (300); The bidirectional power converter (400) is used to control the charging current or discharging current of the battery system (300) electrically connected to the bidirectional power converter (400) according to the received control signal.

2. The energy storage power supply device according to claim 1, characterized in that: The device also includes: A power conversion system (500) comprising a DC end and an AC end, wherein the DC end is electrically connected to each of the bidirectional power converters (400) via a DC bus, and the AC end is electrically connected to the external power grid; The power conversion system (500) is used to convert the alternating current from the external power grid into direct current in a charging mode, or to convert the direct current from each battery system (300) into alternating current in a discharging mode.

3. The energy storage power supply device according to claim 1, characterized in that: The battery system further comprises a battery management system (3002) and a battery pack (3004); The battery management system (3002) is used to obtain battery information of the battery pack (3004) and transmit the battery information to the battery control unit (200).

4. The energy storage power supply device according to claim 1, characterized in that: At least one of the battery type, battery capacity information, and battery voltage information of the N battery systems (300) is different.

5. A method for controlling an energy storage power supply, characterized in that: A battery control unit applied to an energy storage power supply device, the energy storage power supply device comprising: an energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems, the method comprising: receiving a current power requirement sent by the energy management unit, where the current power requirement includes a discharge power requirement or a charge power requirement; Acquiring battery information of each of the battery systems, and determining a state of charge of each of the battery systems according to the battery information of each of the battery systems; The energy state of the energy storage power supply device is determined according to the charge state of each battery system and the battery information of each battery system; the calculation formula of the energy state is: Wherein, SOE is the energy state, n is the number of the battery systems in the energy storage power supply device, i represents the i-th battery system in the energy storage power supply device, SOC i is the state of charge of the ith battery system, Q i is the rated capacity of the ith battery system, U i is the voltage of the ith battery system; The charging time or discharging time of the energy storage power supply device is determined according to the energy state of the energy storage power supply device, the battery information of each battery system and the current power demand; the calculation formula of the charging time is: Wherein, t1 is the charging time, P1 is the charging power requirement; the calculation formula of the discharge time is: Wherein, t2 is the discharge time, and P2 is the discharge power requirement; When the working mode of the energy storage power supply device is the charging mode, the charging current is determined according to the ratio of the charging capacity of each battery system to the charging time, or when the working mode is the discharging mode, the discharging current is determined according to the ratio of the discharging capacity to the discharging time; the calculation formula of the charging current is: Among them, I ci is the charging current, (1-SOC i )·Q i is the charging capacity of the ith battery system; the calculation formula of the discharge current is: Among them, I di is the discharge current, SOC i Q i is the discharge capacity of the ith battery system; Obtaining a control signal for each of the battery systems according to the charging current or discharging current for each of the battery systems and the working mode of the energy storage power supply device; For any of the battery systems, a control signal for the battery system is sent to a bidirectional power converter electrically connected to the battery system, so that the bidirectional power converter controls the charging current or discharging current of the battery system according to the control signal.

6. The energy storage power supply control method according to claim 5, characterized in that: Determining the energy state of the energy storage power supply device according to the state of charge of each of the battery systems and the battery information of each of the battery systems includes: Determining the remaining power of the energy storage power supply device according to the state of charge and battery information of each battery system; Determining the rated power of the energy storage power supply device according to the battery information of each of the battery systems; The energy state of the energy storage power supply device is determined according to the remaining electric energy and the rated electric energy.

7. The method according to claim 6, characterized in that Determining the remaining power of the energy storage power supply device according to the state of charge and battery information of each of the battery systems includes: For any of the battery systems, determining the remaining power in the battery system according to the state of charge, rated capacity and voltage of the battery system; The residual electric energy of each battery system is added together to obtain the residual electric energy of the energy storage power supply device.

8. The method according to claim 6, characterized in that Determining the rated power of the energy storage power supply device according to the battery information of each of the battery systems includes: For any of the battery systems, determining the rated power of the battery system according to the rated capacity and voltage of the battery system; The rated power of each battery system is added together to obtain the rated power of the energy storage power supply device.

9. An energy storage power supply control device, applied to a battery control unit in an energy storage power supply device as claimed in any one of claims 1 to 4, the energy storage power supply device comprising: An energy management unit, a battery control unit, N battery systems, and N bidirectional power converters electrically connected to each of the battery systems, characterized in that it includes: A receiving module, used to receive a current power requirement sent by the energy management unit, where the current power requirement includes a discharge power requirement or a charge power requirement; A determination module, used to obtain battery information of each of the battery systems, and determine the state of charge of each of the battery systems according to the battery information of each of the battery systems; determine the energy state of the energy storage power supply device according to the state of charge of each of the battery systems and the battery information of each of the battery systems; determine the charging time or discharging time of the energy storage power supply device according to the energy state of the energy storage power supply device, the battery information of each of the battery systems and the current power demand; when the working mode of the energy storage power supply device is the charging mode, determine the charging current according to the ratio of the charging capacity of each of the battery systems to the charging time, or when the working mode is the discharging mode, determine the discharging current according to the ratio of the discharging capacity to the discharging time; Among them, the calculation formula of the energy state is: Wherein, SOE is the energy state, n is the number of the battery systems in the energy storage power supply device, i represents the i-th battery system in the energy storage power supply device, SOC i is the state of charge of the ith battery system, Q i is the rated capacity of the ith battery system, U i is the voltage of the ith battery system; the calculation formula for the charging time is: Wherein, t1 is the charging time, P1 is the charging power requirement; the calculation formula of the discharge time is: Wherein, t2 is the discharge time, P2 is the discharge power requirement; the calculation formula of the charging current is: Among them, I ci is the charging current, (1-SOC i )·Q i is the charging capacity of the ith battery system; the calculation formula of the discharge current is: Among them, I di is the discharge current, SOC i Q i is the discharge capacity of the ith battery system; A sending module is used to obtain a control signal for any of the battery systems based on the charging current or discharging current of the battery system and the working mode of the energy storage power supply device, and send the control signal for the battery system to a bidirectional power converter electrically connected to the battery system, so that the bidirectional power converter controls the charging current or discharging current of the battery system according to the control signal.

10. A single chip microcomputer, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 5 to 8 are implemented.

Images