Auxiliary power supply, energy storage system and direct current power determination method of auxiliary power supply

Abstract

The invention relates to the technical field of energy, and provides an auxiliary power supply, an energy storage system, a direct current power determination method of the auxiliary power supply, electronic equipment and a computer readable storage medium. The invention relates to an auxiliary power supply, which comprises a confluence cabinet and a high-voltage box, the power of the direct current output by the alternating-current and direct-current conversion unit in the auxiliary power supply is set to at least meet the power consumption required by N (Y / M) analog front-end units in the X energy storage devices to execute the equalization operation, X and Y are both integers larger than 0, N is larger than or equal to 1 and smaller than X, and M is smaller than or equal to Y, so that when the auxiliary power supply provides auxiliary power for the X energy storage devices, the balance operation of the X energy storage devices can be achieved. The power demand (power demand) of the energy storage equipment for the auxiliary power supply can be met to the greatest extent, and the energy storage equipment does not need to utilize the electric energy of the battery cells of the energy storage equipment as the auxiliary power supply for supplying power, so that the phenomena that the energy utilization rate is reduced and the balancing operation frequency among the battery cells is increased due to the built-in auxiliary source of the energy storage equipment can be avoided.

Description

Technical Field

[0001] This application belongs to the field of energy technologies, and particularly relates to an auxiliary power supply, an energy storage system, a method for determining the DC power of the auxiliary power supply, an electronic device, and a computer-readable storage medium. Background Art

[0002] With the rapid development of new energy technologies, more and more green power generation devices have been popularized and promoted. For example, solar power generation devices, wind power generation devices, etc. are installed on the roofs of users for power generation, and then energy storage devices are used to store the electric energy obtained from the power generation, which can not only be used by users at any time, but also supply power to the power grid. As a result, the demand for configuring energy storage systems for users has also increased.

[0003] However, in actual use, users may connect energy storage devices of different manufacturers or different specifications to the same energy storage system. For some energy storage devices, although they can draw power from their own battery cells through an internal auxiliary power supply to supply power to the internal circuit, this not only consumes the electric energy of the battery cells, reduces the energy utilization rate during the power conversion process, but also may increase the number of equalization operations between the battery cells in the energy storage device. Based on this, providing a new auxiliary power supply solution is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The purpose of this application is to provide an auxiliary power supply, an energy storage system, a method for determining the DC power of the auxiliary power supply, an electronic device, and a computer-readable storage medium, aiming to provide a new auxiliary power supply solution to avoid the phenomenon of reduced energy utilization rate and increased number of equalization operations between battery cells caused by the internal auxiliary power supply of the energy storage device.

[0005] The first aspect of the embodiments of this application provides an auxiliary power supply, including:

[0006] A busbar cabinet configured with an AC power source;

[0007] A high-voltage box connected to at most X energy storage devices, configured with an AC-DC conversion unit, the AC-DC conversion unit being configured with an AC-side connection end and a DC-side connection end, the AC-side connection end being used to connect to the AC power source, the DC-side connection end being used to connect to the energy storage device, and the AC-DC conversion unit being used to perform DC conversion on the alternating current provided by the AC power source to provide direct current for the energy storage device;

[0008] Wherein, Y battery cells are configured in the energy storage device;

[0009] The power of the direct current satisfies at least the power consumption required for the equalization operation of N(Y / M) analog front-end units in X energy storage devices; both X and Y are integers greater than 0; N satisfies 1≤N<X; M is the number of channels for the analog front-end unit to detect the battery cells, Y / M is the number of analog front-end units in the energy storage device, and M≤Y.

[0010] In the second aspect of the embodiments of the present application, an energy storage system is provided, including the auxiliary power supply provided in the first aspect above, and X energy storage devices;

[0011] The energy storage device is configured with a balancing branch, and the balancing branch includes an active balancing branch;

[0012] The analog front-end unit is used to control the active balancing branch to perform active balancing operations on the battery cells.

[0013] In the third aspect of the embodiments of the present application, a method for determining the DC power of an auxiliary power supply is provided, which is used to determine the DC power of the AC-DC conversion unit in the auxiliary power supply in the first aspect above. The method for determining the DC power includes:

[0014] Obtain the number Y / M of analog front-end units in the energy storage device, and the unit electrical parameters when the analog front-end unit controls the balancing branch to perform balancing operations on the battery cells;

[0015] Based on a preset power limit strategy, the number Y / M of analog front-end units, and the unit electrical parameters, calculate the basic load power; wherein, the power limit strategy at least includes the limit multiple N of the analog front-end unit that controls the balancing branch to perform balancing operations;

[0016] Use the basic load power to calculate the power of the direct current; wherein, the power of the direct current at least satisfies the power consumption required for N(Y / M) analog front-end units in X energy storage devices to perform balancing operations.

[0017] In the fourth aspect of the embodiments of the present application, an electronic device is provided, including: a memory, a processor, and a computer program stored in the memory and executable on the electronic device. When the processor executes the computer program, the steps of the method for determining the DC power of the auxiliary power supply provided in the second aspect above are implemented.

[0018] In the fifth aspect of the embodiments of the present application, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for determining the DC power of the auxiliary power supply provided in the second aspect above are implemented.

[0019] The beneficial effects of the embodiments of the present invention compared with the prior art are:

[0020] An auxiliary power supply provided above includes a busbar cabinet and a high-voltage box. Among them, the busbar cabinet is configured with an AC source. The high-voltage box is connected to at most X energy storage devices, and the high-voltage box is configured with an AC-DC conversion unit. Since the AC-DC conversion unit is configured with an AC-side connection terminal and a DC-side connection terminal, the AC source can be connected through the AC-side connection terminal, and the energy storage device can be connected through the DC-side connection terminal. The AC-DC conversion unit is used to perform DC conversion on the alternating current provided by the AC source, so as to provide direct current for the energy storage device. Considering that when the auxiliary power supply supplies power to the energy storage device, the component with the largest power consumption demand of the energy storage device is the Analog Front-End (AFE), especially when the analog front-end unit realizes the cell equalization operation, the power consumption is the largest. Based on this, let the number of cells configured in the energy storage device be Y, and the number of channels for the analog front-end unit to detect the cells be M. Then, the number of analog front-end units in the energy storage device can be determined as Y / M. In this way, by setting the power of the direct current output by the AC-DC conversion unit in the auxiliary power supply to at least meet the power consumption required for the N(Y / M) analog front-end units in X energy storage devices to perform equalization operations, and letting both X and Y be integers greater than 0, N satisfies 1≤N<X, and M≤Y, it can be ensured that when the auxiliary power supply provides auxiliary power for X energy storage devices, the power consumption demand (power demand) of the energy storage device for the auxiliary power supply can be maximally met, without the energy storage device using the electrical energy of its own cells as the auxiliary power supply, thereby avoiding the phenomenon of reduced energy utilization rate and increased cell equalization operation times caused by the built-in auxiliary power source in the energy storage device.

[0021] In addition, since the auxiliary power supply provided in this application sets the AC source (such as the power grid, uninterruptible power supply, etc.) in the busbar cabinet, the AC source can be directly connected by the high-voltage box, and the AC source is converted by the AC-DC conversion unit in the high-voltage box to obtain direct current that can be used as an auxiliary power supply for at most X energy storage devices. This is not only convenient for configuration in various energy storage power consumption scenarios, but also for the existing power grid structure or the existing energy storage system. The auxiliary power supply provided in this application can also be added as a new module to the existing power grid structure or the existing energy storage system, which can further improve the stability and power consumption efficiency of the existing power grid structure or the existing energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of an auxiliary power supply provided by an embodiment of the present application;

[0023] Figure 2 It is a schematic structural diagram of an auxiliary power supply provided by another embodiment of the present application;

[0024] Figure 3 It is a schematic diagram of a specific implementation of the auxiliary power supply provided by an embodiment of the present application;

[0025] Figure 4 It is a schematic structural diagram of an energy storage system provided by an embodiment of the present application;

[0026] Figure 5 It is a flowchart of implementing a method for determining the DC power of an auxiliary power supply provided by an embodiment of the present application;

[0027] Figure 6 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to 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.

[0029] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0030] Exemplarily, in some usage scenarios, users may connect energy storage devices of different manufacturers or different specifications to the same energy storage system. For some energy storage devices, although they can draw power from their own battery cells through the built-in auxiliary power source to supply power to the internal circuit, this not only consumes the electrical energy of the battery cells, reduces the energy utilization rate during the power conversion process, but also may increase the number of balancing operations between the battery cells in the energy storage device. Based on this, providing a new auxiliary power supply solution is a technical problem that urgently needs to be solved.

[0031] In order to solve the above technical problems, the present embodiment provides an auxiliary power supply, including a junction box and a high-voltage box. Among them, the junction box is configured with an AC source. The high-voltage box is connected to at most X energy storage devices, and the high-voltage box is configured with an AC-DC conversion unit. Since the AC-DC conversion unit is configured with an AC side connection terminal and a DC side connection terminal, the AC source can be connected through the AC side connection terminal, and the energy storage device can be connected through the DC side connection terminal. The AC-DC conversion unit is used to convert the AC power provided by the AC source into DC power, so that DC power can be provided to the energy storage device. Considering that when the auxiliary power supply supplies power to the energy storage device, the component with the largest power demand of the energy storage device is the analog front-end unit, especially the analog front-end unit has the largest power consumption when realizing the battery cell balancing operation. Based on this, let the number of battery cells configured in the energy storage device be Y, and the number of channels for the analog front-end unit to detect the battery cells be M, and then it can be determined that the number of analog front-end units in the energy storage device is Y / M. In this way, by setting the power of the DC power output by the AC / DC conversion unit in the auxiliary power supply to at least meet the power consumption required for N (Y / M) analog front-end units in the X energy storage devices to perform balancing operations, and setting X and Y to integers greater than 0, N to satisfy 1≤N<X, and M≤Y, the auxiliary power supply can provide auxiliary power for the X energy storage devices, and can meet the power demand (power demand) of the energy storage devices for the auxiliary power supply to the greatest extent, without the need for the energy storage devices to use the power of their own battery cells as auxiliary power supply, thereby avoiding the phenomenon of reduced energy utilization and increased number of balancing operations between battery cells due to the built-in auxiliary source of the energy storage device.

[0032] In addition, since the auxiliary power supply provided by the present application is achieved by setting an AC source (such as a power grid, an uninterruptible power supply, etc.) in a junction box, the AC source can be directly connected to the high-voltage box, and the AC source is converted by the AC-DC conversion unit in the high-voltage box to obtain DC power that can be used as an auxiliary power supply for up to X energy storage devices. It is not only convenient to configure in various energy storage power usage scenarios, but also for existing power grid structures or existing energy storage systems, the auxiliary power supply provided by the present application can also be added as a new module to the existing power grid structure or existing energy storage system, which can further improve the stability and power efficiency of the existing power grid structure or existing energy storage system.

[0033] An auxiliary power supply provided in this embodiment can be configured in the use scenario of the energy storage device. Different from the auxiliary power supply provided by the energy storage device or the built-in auxiliary power supply, the auxiliary power supply provided in this embodiment uses the AC source in the junction box as the power source of the auxiliary power supply, converts the AC power into DC power through the AC / DC conversion unit in the high-voltage box, and then outputs DC power that can meet the power consumption required by at least N (Y / M) analog front-end units in X energy storage devices to perform balancing operations, which can ensure the power supply stability of the auxiliary power supply to the greatest extent.

[0034] The following provides a detailed description of an auxiliary power supply provided by this embodiment through specific implementation manners.

[0035] Figure 1 FIG. shows a schematic structural diagram of an auxiliary power supply provided by an embodiment of the present application. As Figure 1 shown, the auxiliary power supply 100 includes a busbar cabinet 10 and a high-voltage box 20. Specifically:

[0036] The busbar cabinet 10 is configured with an AC source 11. The high-voltage box 20 is connected to at most X energy storage devices. The high-voltage box 20 is configured with an AC-DC conversion unit 21. The AC-DC conversion unit 21 is configured with an AC-side connection end and a DC-side connection end. The AC-side connection end is used to connect to the AC source 11, and the DC-side connection end is used to connect to the energy storage device. The AC-DC conversion unit 21 is used to perform DC conversion on the alternating current provided by the AC source to provide direct current for the energy storage device. Among them, there are Y battery cells configured in the energy storage device. The power of the direct current at least meets the power consumption required for the equalization operation of N(Y / M) analog front-end units in X energy storage devices. Here, both X and Y are integers greater than 0, N satisfies 1≤N<X, M is the number of channels for the analog front-end unit to detect the battery cells, Y / M is the number of analog front-end units in the energy storage device, and M≤Y.

[0037] In this embodiment, the AC source 11 configured in the busbar cabinet 10 may specifically be mains power, an uninterruptible power supply, etc. The AC source 11 is used to provide alternating current for the AC-DC conversion unit 21 in the high-voltage box 20, so that the AC-DC conversion unit 21 can output direct current using this alternating current. Here, considering that when the auxiliary power supply 100 supplies power to the energy storage device, the component with the largest power consumption demand in the energy storage device is the AFE, that is, the analog front-end unit. Especially when the AFE realizes the battery cell equalization operation, the power consumption is the largest.

[0038] Based on this, in all embodiments of the present application, let the number of battery cells configured in the energy storage device be Y, and the number of channels for the analog front-end unit to detect the battery cells be M. Then, the number of analog front-end units in the energy storage device can be determined as Y / M. In this way, by setting the power of the direct current output by the AC-DC conversion unit in the auxiliary power supply to at least meet the power consumption required for the equalization operation of N(Y / M) analog front-end units in X energy storage devices, and making both X and Y integers greater than 0, N satisfy 1≤N<X, and M≤Y, it can be ensured that when the auxiliary power supply provides auxiliary power for X energy storage devices, it can maximally meet the power demand of the energy storage device for the auxiliary power supply.

[0039] In specific implementation, the AC-DC conversion unit 21 in the high-voltage box 20 may specifically be implemented by a unidirectional AC-DC conversion circuit. Here, the unidirectional AC-DC conversion circuit may specifically include a rectification circuit and a DC-DC conversion circuit. Among them, the rectification circuit is used to rectify the alternating current provided by the AC source and then output the initial direct current, and the DC-DC conversion circuit performs voltage conversion on this direct current. For example, the initial direct current is converted into a high-frequency square-wave voltage or current, and then rectified and smoothed into a direct current with a lower voltage for output. Here, the direct current with a lower voltage may specifically be a direct current with a voltage greater than or equal to 30V, and specifically may be a direct current with a voltage of 24V.

[0040] In actual use, the energy storage device mentioned in this embodiment may specifically be an existing battery pack, battery cluster, etc.

[0041] Exemplarily, let the number of battery cells configured in the energy storage device be Y, and Y is an integer greater than 0. In the energy storage device, an analog front-end unit AFE such as an analog front-end chip can be used to monitor the state of the battery cells. Here, let the number of channels for a single analog front-end unit AFE to detect battery cells be M, that is, the number of battery cells connected to a single AFE is M. Taking the energy storage device including 48 battery cells and the number of channels for a single AFE to detect battery cells being 16 as an example, the number of analog front-end units in this energy storage device is 48÷16 = 3. For another example, the energy storage device is configured with 4 AFEs, and the monitoring channel of each AFE is 8. Correspondingly, the number of battery cells in this energy storage device is 8×4 = 32.

[0042] In this embodiment, it may be set that the auxiliary power supply 100 is connected to at most X energy storage devices, where X is an integer greater than 0. Correspondingly, when the auxiliary power supply 100 provides direct current for X energy storage devices, its maximum power should satisfy that all the analog front-end units in the X energy storage devices work at the maximum power consumption.

[0043] Combined with the above example, for a single energy storage device, the quotient of the number of battery cells Y and the number of battery cells M connected to the AFE is the actual deployment number of the AFE in the energy storage device, that is, Y / M. To ensure that the maximum DC power output by the auxiliary power supply 100 can meet the operation of all analog front-end units in X energy storage devices at the maximum power consumption, the maximum number of AFEs in X energy storage devices can be set as X(Y / M). It can be understood that in actual use, for an energy storage device, it is generally not the case that equalization operations are performed on all battery cells. Therefore, the maximum DC power can be set to meet the operation of at least 1 AFE in X energy storage devices at the maximum power consumption. Based on this, the limit number / multiple N of the analog front-end units for which the equalization branch performs equalization operations can be set, that is, let N be the number of AFEs performing equalization operations at the same time. Then, N(Y / M) can be obtained. Let N satisfy 1≤N<X and M≤Y, which can indicate that the electric power of the DC power satisfies the operation of at least 1 AFE at the maximum power consumption, and can also indicate that the electric power of the DC power satisfies the operation of all AFEs at the maximum power consumption.

[0044] It can be understood that in specific implementation, if other loads can also be set in the high-voltage box 20, correspondingly, the power of the DC power output by the AC-DC conversion unit 21 should also meet the power consumption requirements of other loads.

[0045] Figure 2 The structural schematic diagram of the auxiliary power supply provided by another embodiment of the present application is shown. As an embodiment, different from Figure 1 the embodiment shown, Figure 2 in the embodiment shown, the auxiliary power supply 100 further includes a control unit 22, and the control unit 22 is configured in the high-voltage box 20. Specifically:

[0046] The control unit 22 is used to obtain the voltage values of Y battery cells from the analog front-end unit AFE, and instruct the analog front-end unit AFE to control the equalization branch to perform active equalization operations on the battery cells according to the voltage values of the Y battery cells. The power of the DC power satisfies at least the sum of the power consumption required for N(Y / M) analog front-end units AFE to perform active equalization operations at the current altitude and temperature and the power consumption of the control unit 22.

[0047] In this embodiment, the control unit 22 can interact with the AFE in the energy storage device to obtain the voltage conditions of each battery cell in each energy storage device. Here, the control unit 22 can include a processor pre-configured with a battery management system program. By interacting with the AFE, it can instruct the AFE to control the equalization branch in the energy storage device to achieve voltage equalization operations among the battery cells in the energy storage device.

[0048] It should be noted that in this embodiment, the control unit 22 instructs the analog front-end unit AFE to control the equalization branch to perform equalization operations on the battery cells according to the voltage values of the Y battery cells, which is an active equalization operation. Since the active equalization operation uses the battery cells with higher voltages in the energy storage device to charge the battery cells with lower voltages, the AFE needs to detect more battery cell states during this process and also send the detected data to the control unit 22 to facilitate determining whether to end the equalization operation. Based on this, when instructing the analog front-end unit AFE to control the equalization branch to perform active equalization operations on the battery cells according to the voltage values of the Y battery cells, the power consumption of the AFE can be regarded as the maximum power consumption required for the AFE to perform the equalization operation.

[0049] It is easy to understand that when the auxiliary power supply 100 is at different altitudes, affected by the low temperature at high altitudes, when controlling the DC power output, the current altitude temperature can also be considered. Based on this, by combining the power consumption of the control unit 22 with the power consumption required for N(Y / M) analog front-end units AFE to perform active equalization operations at the current altitude temperature, the power of the DC power can be determined to be at least the sum of the two.

[0050] In other embodiments, more other loads can also be configured in the auxiliary power supply 100, such as relays, indicator lights, and shunt releases. Here, the other loads are also powered by the AC-DC conversion unit 21, so the power of the DC power output by the AC-DC conversion unit 21 can also take into account the power consumption of the actually set other loads.

[0051] Table 1 shows an example of the power consumption data of other loads.

[0052] Other loads Power consumption Description Control unit (BMS main control) 1 * 5W = 5W Long term Relay 2 * 50 = 100W Instantaneous Indicator light 2 * 1W = 2W Long term Shunt release 1 * 1W = 1W Long term

[0053] Table 1

[0054] As shown in Table 1, when the auxiliary power supply 100 only includes the control unit 22, the power consumption of the control unit 22 in Table 1, which is 5W, can be combined with the power consumption required for N(Y / M) analog front-end units AFE to perform active equalization operations at the current altitude temperature for summation, and then the actual power demand of the DC power output by the AC-DC conversion unit can be determined. It can be understood that in actual implementation, if the auxiliary power supply 100 also includes other loads, such as at least one of a relay, an indicator light, and a shunt release, the power consumption summation calculation can also be performed based on the example shown in Table 1 to obtain the actual power demand of the DC power output by the AC-DC conversion unit.

[0055] Figure 3 Shows a specific implementation schematic diagram of the auxiliary power supply provided by the embodiment of the present application. Combining Figures 1 to 3, As an embodiment, the AC power source 11 includes an uninterruptible power supply, and the uninterruptible power supply is configured with a neutral line N and a live line L. Correspondingly, the AC side connection terminals of the AC-DC conversion unit 21 include a neutral line connection terminal N1, a live line connection terminal L1, and a ground line connection terminal PE. As Figure 3 shown, the neutral line connection terminal N1 is connected to the neutral line N, the live line connection terminal L1 is connected to the live line L, and the ground line connection terminal PE is grounded. The AC-DC conversion unit 21 specifically includes an AC-DC conversion circuit, that is, Figure 3 the AC-DC conversion circuit 211 in

[0056] As an embodiment, the AC-DC conversion unit 21 is further configured with an anti-reverse branch (not shown in the figure), and the anti-reverse branch is connected to the positive connection terminal V+ of the AC-DC conversion circuit 211. The anti-reverse branch is used to prevent the electric energy of the energy storage device from flowing back into the AC-DC conversion unit 21. In a specific implementation, the anti-reverse branch can specifically be implemented by using an existing circuit that transmits electric energy unidirectionally.

[0057] Combined with Figure 3 the example shown, as an embodiment, the anti-reverse branch includes a diode D1. The anode terminal of the diode D1 is used to connect to the positive connection terminal V+ of the AC-DC conversion circuit 211, and the cathode of the diode D1 and the negative connection terminal V- of the AC-DC conversion circuit 211 together serve as the DC side connection terminal.

[0058] In this embodiment, the cathode of the diode D1 can be regarded as an extension of the positive connection terminal V+ of the AC-DC conversion circuit 211 and is used to connect to the positive electrode of the energy storage device and / or other loads. Based on this, the cathode of the diode D1 and the negative connection terminal V- of the AC-DC conversion circuit 211 can together serve as the DC side connection terminal.

[0059] It can be understood that in Figure 3 , the energy storage device can specifically be a battery pack. Taking X energy storage devices as 8 battery packs as an example, the positive electrode of each battery pack is connected to the cathode of the diode D1, and the negative electrode of each battery pack is connected to the negative connection terminal V- of the AC-DC conversion circuit 211. In this way, the AC-DC conversion circuit 211 can provide direct current as an auxiliary power source for each battery pack connected thereto.

[0060] Figure 4 shows a schematic structural diagram of an energy storage system provided by an embodiment of the present application. As Figure 4As shown in the figure, an energy storage system 200 provided by an embodiment of the present application includes the auxiliary power supply 100 provided by the above embodiment and X energy storage devices. In this embodiment, the energy storage device is configured with a balancing branch (not shown in the figure), and the balancing branch includes an active balancing branch. The analog front-end unit AFE is used to control the active balancing branch to perform an active balancing operation on the battery cells.

[0061] It can be understood that the active balancing branch in this embodiment can be any active balancing branch in the existing energy storage device, and no limitation is made here. The improvement points and specific implementation manners related to the present application have been Figures 1 to 3 detailedly described in the corresponding embodiments. When specifically implemented, the auxiliary power supply 100 can be configured in the energy storage system 200 on the basis of the Figures 1 to 3 corresponding embodiment, so it will not be elaborated here.

[0062] This embodiment also provides a method for determining the DC power of the auxiliary power supply, which is used to determine the DC power of the AC-DC conversion unit 21 in the auxiliary power supply 100 in the above embodiment. It can be understood that the execution subject of the method for determining the DC power of the auxiliary power supply can be a terminal device, specifically a host computer, a mobile terminal, such as a mobile phone, a tablet computer, etc. When specifically implemented, the method for determining the DC power of the auxiliary power supply can be configured as a corresponding code program, and by configuring the code program into a tooling for configuring the auxiliary power supply and / or the energy storage system, the steps of the method for determining the DC power of the auxiliary power supply can be executed.

[0063] Figure 5 The figure shows a flowchart of the implementation of a method for determining the DC power of an auxiliary power supply provided by an embodiment of the present application. The following combines Figure 5 to elaborate in detail on a method for determining the DC power of an auxiliary power supply provided by this embodiment. As Figure 5 shown, the method for determining the DC power of the auxiliary power supply includes:

[0064] 110: Obtain the number Y / M of analog front-end units in the energy storage device, and the unit electrical parameter when the analog front-end unit controls the balancing branch to perform a balancing operation on the battery cells.

[0065] In 110, the number Y / M of analog front-end units in the energy storage device is related to the number Y of battery cells in the energy storage device and the number M of channels through which the analog front-end unit detects the battery cells. Specifically, in Figure 1This will not be elaborated here as it will be introduced in detail in the embodiments. The unit electrical parameters when the analog front-end unit controls the equalization branch to perform equalization operations on the battery cells refer to the equalization current and / or equalization voltage, etc., of a unit number of analog front-end units during the equalization operation. Here, the unit number can be based on several analog front-end units, such as each analog front-end unit, or multiple analog front-end units set in each energy storage device.

[0066] In specific implementation, according to the requirements for building the auxiliary power supply, the maximum number of energy storage devices that the auxiliary power supply can be connected to can be determined. Through the electrical detection of the analog front-end units of the energy storage devices during the equalization operation, such as the maximum equalization current, equalization voltage, etc., the unit electrical parameters when the analog front-end unit controls the equalization branch to perform equalization operations on the battery cells can be obtained.

[0067] 120: Based on the preset power limit strategy, the number Y / M of analog front-end units, and the unit electrical parameters, calculate the basic load power. Among them, the power limit strategy at least includes the limit multiple N of the analog front-end units that control the equalization branch to perform the equalization operation.

[0068] In 120, the basic load power refers to the maximum power of the direct current required under the number of analog front-end units corresponding to the limit multiple N.

[0069] In specific implementation, the power limit strategy and the calculation logic can be pre-configured using a function formula. After obtaining the number Y / M of analog front-end units and the unit electrical parameters, inputting them into this function can achieve the calculation operation of the basic load power.

[0070] Taking the unit electrical parameters including the maximum equalization current, equalization voltage, and equalization efficiency of a single analog front-end unit as an example. Assuming the limit multiple N = 4, the maximum equalization current is 3A, the equalization voltage is 5V, and the equalization efficiency is 85%, the calculated basic load power can be the product of the above values. That is, the basic load power = 4 × 3A × 5V ÷ 85% ≈ 70.6W.

[0071] 130: Calculate the power of the direct current using the basic load power; among them, the power of the direct current at least meets the power consumption required for N(Y / M) analog front-end units in X energy storage devices to perform the equalization operation.

[0072] In 130, when calculating the power of the direct current using the basic load power, if there are other loads in the auxiliary power supply, the power consumption of these other loads needs to be calculated together.

[0073] In this embodiment, when only considering the maximum power consumption of the analog front-end units, it is only necessary to ensure that the power of the direct current at least meets the power consumption required for N(Y / M) analog front-end units in X energy storage devices to perform the equalization operation.

[0074] As an embodiment, the auxiliary power supply further includes a control unit, which is configured in the high-voltage box. The preset power limit strategy further includes the power consumption of the control unit. Accordingly, step 120 above includes:

[0075] Calculate the first load power consumption of the analog front-end unit according to the limit multiple N, the number Y / M of analog front-end units, and the unit electrical parameters.

[0076] Take the sum of the power consumption of the control unit and the first load power consumption as the basic load power.

[0077] Combined with the above example, assuming the limit multiple N = 4, the maximum equalization current is 3A, the equalization voltage is 5V, and the equalization efficiency is 85%, the first load power consumption of the analog front-end unit can be the product of the above values. In this example, the first load power consumption is the same as the basic load power in the above example, that is, the first load power consumption = 4×3A×5V÷85≈70.6W. Here, the power consumption of the control unit shown in Table 1 can be combined, and the sum of the power consumption of the control unit and the first load power consumption is taken as the basic load power. Therefore, the basic load power = 70.6W + 5W = 75.6W.

[0078] In some examples, when other loads also include relays, indicator lights, shunt releases, and even slave control units in energy storage devices, the power consumption of such other loads also needs to be calculated. For example, the power consumption of the slave control unit of the energy storage device is 1W, and the power consumption of the relay, indicator light, and shunt release can be obtained by referring to Table 1. Based on this, taking X = 8 as an example, that is, the auxiliary power supply provides direct current for at most 8 energy storage devices, so the basic load power = 70.6W + 5W + 100W + 2W + 1W + 8×1W = 186.6W.

[0079] It can be understood that when actually setting the auxiliary power supply, when considering the influence of altitude and temperature on the direct current output of the auxiliary power supply, the power of the direct current can be calculated by selecting the corresponding derating factor.

[0080] As an embodiment, calculating the power of the direct current using the basic load power includes:

[0081] Obtain the derating factor corresponding to the current altitude and temperature. Calculate the power of the direct current according to the preset power factor and the basic load power; wherein, the power factor is used to indicate the rated operating efficiency of the AC-DC conversion unit.

[0082] Exemplarily, the derating factor corresponding to the current altitude and temperature is calculated by the following formulas 1 and 2. Specifically:

[0083] T = 55 + W×(h - 2000) / 1000 Formula 1

[0084] K = -0.0148*T + 1.5133 Formula 2

[0085] In Formula 1, 3 ≤ W ≤ 5. W represents the altitude influence coefficient, T represents the ambient temperature, and h represents the actual altitude. When W takes the value of 5, it represents the maximum influence coefficient. For example, when the actual altitude h = 2000m is substituted into the formula, T = 55°C; when the actual altitude h = 3000m is substituted into the formula, T = 60°C; when the actual altitude h = 4000m is substituted into the formula, T = 65°C; when the actual altitude h = 5000m is substituted into the formula, T = 70°C.

[0086] In Formula 2, K is the derating factor and T is the ambient temperature calculated using Formula 1. For example, when T = 70°C is substituted into Formula 2, K = 0.48 can be obtained.

[0087] In some embodiments, when calculating the power of direct current according to the preset power factor and the base load power, the working efficiency of the AC-DC conversion unit can also be specifically considered.

[0088] Combined with the base load power obtained in the above example = 70.6W + 5W + 100W + 2W + 1W + 8×1W = 186.6W, taking the working efficiency of the AC-DC conversion unit as 90% as an example, when the derating factor K = 0.48, using the base load power, the derating factor, and the working efficiency of the AC-DC conversion unit, the power of direct current of the AC-DC conversion unit can be calculated by combining the following Formula 3. Specifically:

[0089] Power of direct current = Base load power ÷ Working efficiency of AC-DC conversion unit ÷ Derating factor K = 186.6W ÷ 0.9 ÷ 0.48 ≈ 432W.

[0090] A method for determining the DC power of an auxiliary power supply provided by the above solution is used to determine the power of the direct current output by the AC-DC conversion unit in the auxiliary power supply embodiment. Based on the actual application scenario of the auxiliary power supply, considering that when the auxiliary power supply supplies power to the energy storage device, the component with the largest power consumption demand in the energy storage device is the analog front-end unit. In particular, the power consumption required for the analog front-end unit to implement the cell balancing operation is the largest. Based on this, let the number of cells configured in the energy storage device be Y, and the number of channels for the analog front-end unit to detect the cells be M. Then, the number of analog front-end units in the energy storage device can be determined as Y / M. In this way, by obtaining the number Y / M of the analog front-end units in the energy storage device and the unit electrical parameters when the analog front-end unit controls the balancing branch to perform the cell balancing operation, based on the preset power limit strategy, the number Y / M of the analog front-end units, and the unit electrical parameters, the basic load power is calculated. Since the power limit strategy at least includes the limit multiple N of the analog front-end unit that controls the balancing branch to perform the balancing operation, the power of the direct current calculated using the basic load power can at least meet the power consumption required for N(Y / M) analog front-end units in X energy storage devices to perform the balancing operation. Therefore, when the auxiliary power supply provides auxiliary power for X energy storage devices, it can maximally meet the power consumption demand (power demand) of the energy storage device for the auxiliary power supply, without the energy storage device using the electrical energy of its own cells as the auxiliary power supply, thereby avoiding the phenomenon of reduced energy utilization rate and increased cell balancing operation times caused by the built-in auxiliary power source in the energy storage device.

[0091] Figure 6 is a structural block diagram of an electronic device provided by an embodiment of the present application. As Figure 6 shown, the electronic device 6 of this embodiment includes: a processor 60, a memory 61, and a computer program 62 stored in the memory 61 and executable on the processor 60, such as a program for the method for determining the DC power of the auxiliary power supply. When the processor 60 executes the computer program 62, the steps in each of the above embodiments of the method for determining the DC power of the auxiliary power supply are implemented, such as Figure 5 the steps shown, which will not be elaborated here.

[0092] Exemplarily, the computer program 62 can be divided into one or more units. The one or more units are stored in the memory 61 and executed by the processor 60 to complete the present application. The one or more units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 62 in the electronic device 6. The electronic device may include, but is not limited to, the processor 60 and the memory 61. Those skilled in the art can understand, Figure 6This is only an example of the electronic device 6, which does not constitute a limitation on the electronic device 6. It may include more or fewer components than those shown in the figure, or combine certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, etc.

[0093] The so-called processor 60 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0094] The memory 61 may be an internal storage unit of the electronic device 6, such as the hard disk or memory of the electronic device 6. The memory 61 may also be an external storage device of the electronic device 6, such as a plug-in hard disk equipped on the electronic device 6, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 61 may also include both the internal storage unit and the external storage device of the electronic device 6. The memory 61 is used to store the computer program and other programs and data required by the electronic device. The memory 61 may also be used to temporarily store the data that has been output or will be output.

[0095] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An auxiliary power supply, characterized in that, Comprising: A busbar cabinet, configured with an AC power source; A high-voltage box connected to at most X energy storage devices, configured with an AC-DC conversion unit, the AC-DC conversion unit being configured with an AC-side connection end and a DC-side connection end, the AC-side connection end being used to connect to the AC power source, the DC-side connection end being used to connect to the energy storage devices, and the AC-DC conversion unit being used to perform DC conversion on the alternating current provided by the AC power source to provide direct current for the energy storage devices; Wherein, Y battery cells are configured in the energy storage device; The power of the direct current at least satisfies the power consumption required for the equalization operation of N(Y / M) analog front-end units among the X energy storage devices; both X and Y are integers greater than 0; N satisfies 1≤N<X; M is the number of channels for the analog front-end unit to detect the battery cells, Y / M is the number of analog front-end units in the energy storage device, and M≤Y.

2. The auxiliary power supply according to claim 1, wherein It further includes a control unit, configured in the high-voltage box; The control unit is used to obtain the voltage values of the Y battery cells from the analog front-end unit, and according to the voltage values of the Y battery cells, instruct the analog front-end unit to control the equalization branch to perform an active equalization operation on the battery cells; The power of the direct current at least satisfies the sum of the power consumption required for N(Y / M) analog front-end units to perform the active equalization operation at the current altitude and temperature, and the power consumption of the control unit.

3. The auxiliary power supply according to claim 1, characterized in that, The AC power source includes an uninterruptible power supply, and the uninterruptible power supply is configured with a neutral line and a live line; The AC-side connection end includes a neutral line connection end, a live line connection end, and a ground line connection end, the neutral line connection end is connected to the neutral line, the live line connection end is connected to the live line, and the ground line connection end is grounded.

4. The auxiliary power supply according to claim 3, characterized in that The AC-DC conversion unit includes an AC-DC conversion circuit, and the AC-DC conversion circuit is configured with a positive connection end and a negative connection end, the positive connection end is used to connect to the positive electrode of each energy storage device, and the negative connection end is used to connect to the negative electrode of each energy storage device.

5. The auxiliary power supply according to claim 4, wherein The AC-DC conversion unit is further configured with an anti-reverse branch, and the anti-reverse branch is connected to the positive connection end of the AC-DC conversion circuit, and the anti-reverse branch is used to prevent the electric energy of the energy storage device from flowing back to the AC-DC conversion unit.

6. The auxiliary power supply according to claim 5, wherein The anti-reverse branch includes a diode, the anode end of the diode is used to connect to the positive connection end of the AC-DC conversion circuit, and the cathode of the diode and the negative connection end of the AC-DC conversion circuit together serve as the DC-side connection end.

7. A energy storage system, characterized in that, Including the auxiliary power supply according to any one of claims 1 to 6, and X energy storage devices; The energy storage device is configured with an equalization branch, and the equalization branch includes an active equalization branch; The analog front-end unit is used to control the active equalization branch to perform an active equalization operation on the battery cells.

8. A method for determining the DC power of an auxiliary power supply, characterized in that, For determining the direct current power of the AC-DC conversion unit in the auxiliary power supply according to claim 1, the method for determining the direct current power includes: Obtaining the number Y / M of analog front-end units in the energy storage device, and the unit electrical parameter when the analog front-end unit controls the equalization branch to perform an equalization operation on the battery cells; Calculate the basic load power based on a preset power limit strategy, the number Y / M of the analog front-end units, and the unit electrical parameters; wherein, the power limit strategy at least includes a limit multiple N of the analog front-end units that control the equalization branch to perform the equalization operation. Calculate the power of the direct current by using the basic load power; wherein, the power of the direct current at least satisfies the power consumption required for N(Y / M) analog front-end units among the X energy storage devices to perform the equalization operation.

9. The method for determining DC power according to claim 8, characterized in that, The auxiliary power supply further includes a control unit, which is configured in the high-voltage box; the preset power limit strategy further includes the power consumption of the control unit. The calculating the basic load power based on a preset power limit strategy, the number Y / M of the analog front-end units, and the unit electrical parameters includes: Calculate the first load power consumption of the analog front-end unit according to the limit multiple N, the number Y / M of the analog front-end units, and the unit electrical parameters. Take the sum of the power consumption of the control unit and the first load power consumption as the basic load power.

10. The method for determining the DC power according to claim 8 or 9, characterized in that The calculating the power of the direct current by using the basic load power includes: Obtain the derating factor corresponding to the current altitude temperature. Calculate the power of the direct current according to a preset power factor and the basic load power; wherein, the power factor is used to indicate the rated working efficiency of the AC-DC conversion unit.

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