Power supply system and DC-DC battery

Abstract

The invention provides a power supply system and a DC-DC battery, the power supply system comprises a straight-through battery and a DC-DC battery, the DC-DC battery comprises a battery core pack and a DC-DC conversion circuit, and the straight-through battery and the DC-DC battery are both used for supplying power to a load through a bus. Under the condition that the voltage value of the bus is smaller than a preset working voltage value, when the voltage value of the direct current output by the direct-through battery is larger than the voltage value of the direct current output by the DC-DC battery, the direct-through battery is used for supplying power to the load; and when the voltage value of the direct current output by the straight-through battery is smaller than that of the direct current output by the DC-DC battery, the DC-DC battery is used for supplying power to the load. And the DC-DC conversion circuit is used for converting the voltage output by the battery core pack, so that the direct-through battery and the DC-DC battery alternately supply power to the load for multiple times. Normal power utilization of the load when the power grid is abnormal can be ensured, so that the power utilization reliability of the load when the power grid is abnormal can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power supply, in particular to a power supply system and a DC-DC battery. BACKGROUND

[0002] Straight-through batteries (such as lead-acid batteries) are widely used in communication base stations due to their early development and mature technology. However, the capacity of lead-acid batteries is small, and the service life is short. In a poor environment, the actual output power and actual service life of some lead-acid batteries may be even lower, thereby affecting the normal power consumption of the load when the power grid is powered off. SUMMARY

[0003] The present application provides a power supply system and a DC-DC battery. When the power grid is abnormal and cannot supply power to the load, both the straight-through battery and the DC-DC battery can supply power to the load. Compared with the straight-through battery, the DC-DC battery has better performance and longer service life, thereby ensuring the normal power consumption of the load when the power grid is abnormal. Thus, the reliability of the load power consumption when the power grid is abnormal can be improved.

[0004] In a first aspect, a power supply system is provided, which includes a straight-through battery and a direct current-direct current (DC-DC) battery. The DC-DC battery includes a cell pack and a DC-DC conversion circuit. Both the straight-through battery and the DC-DC battery are used to supply power to a load through a bus. When the voltage value of the bus is less than a preset working voltage value: when the voltage value of the direct current output by the straight-through battery is greater than the voltage value of the direct current output by the DC-DC battery, the straight-through battery is used to supply power to the load; and when the voltage value of the direct current output by the straight-through battery is less than the voltage value of the direct current output by the DC-DC battery, the DC-DC battery is used to supply power to the load. The DC-DC conversion circuit is used to convert the voltage output by the cell pack, so that the straight-through battery and the DC-DC battery alternately supply power to the load multiple times.

[0005] In the present application, when the voltage value of the bus is less than the preset working voltage value, both the straight-through battery and the DC-DC battery can supply power to the load, which can ensure the normal power consumption of the load when the power grid is abnormal. Moreover, since the DC-DC battery has better performance and longer service life, compared with the scheme in which the straight-through battery alone supplies power to the load, the present application designs the straight-through battery and the DC-DC battery to alternately supply power to the load, which can further ensure the continuous power consumption of the load when the power grid is abnormal. Thus, the reliability of the load power consumption when the power grid is abnormal can be improved.

[0006] Further, under the condition that the voltage value of the bus is less than the preset working voltage value, the DC-DC conversion circuit can make the through battery and the DC-DC battery be used for multiple times of alternately supplying power to the load by converting the voltage output by the battery cell package. Thus, compared with the scheme that the through battery and the DC-DC battery are used for supplying power to the load alternately when the power grid is powered off, the performance and service life of the through battery and the DC-DC battery can be improved.

[0007] In combination with the first aspect, in a possible design, the initial voltage value of the direct current output by the through battery is greater than the first voltage value corresponding to the direct current output by the DC-DC battery, and the through battery is used for supplying power to the load. When the voltage value of the direct current output by the through battery is equal to the first voltage value, the DC-DC battery is used for outputting the direct current with the first voltage value to supply power to the load.

[0008] In the embodiment of the application, the initial voltage value of the direct current output by the through battery is greater than the first voltage value corresponding to the direct current output by the DC-DC battery. Thus, when the voltage value of the bus is less than the preset working voltage value, the through battery is used for preferentially supplying power to the load compared with the DC-DC battery. When the voltage value of the direct current output by the through battery reaches the first voltage value, the DC-DC battery starts to supply power to the load with the first voltage value, so that the through battery and the DC-DC battery can be alternately used for supplying power to the load. Further, since the through battery is preferentially discharged compared with the DC-DC battery, the through battery can be discharged more, and the service life of the DC-DC battery can be prolonged. Moreover, in most cases, the power grid is powered off only temporarily, that is, the power grid can supply power to the load in a short time. That is to say, the power grid can supply power again after the through battery is discharged for a period of time. Thus, the DC-DC battery does not need to be discharged with the first voltage value, so that the service life of the DC-DC battery can be prolonged.

[0009] In addition, the application designs that the through battery is preferentially discharged compared with the DC-DC battery when the power grid is powered off, which is beneficial to the complete discharge of the through battery. After the through battery is discharged for multiple times, the performance and service life of the through battery are both decreased, and the through battery can be considered to be out of service, that is, the through battery is not used in the future. Thus, when the power grid is powered off or the power supply of the power grid is insufficient in the future, the DC-DC battery with better performance can be used for supplying power to the load, and the reliability of the power supply system for supplying power to the load is improved.

[0010] With reference to the first aspect, in a possible design, when the DC-DC battery is discharging at the first voltage value and the DC-DC battery reaches a first preset condition, the DC-DC conversion circuit is configured to control the DC-DC battery to output a second voltage value, the second voltage value is less than the first voltage value, the pass-through battery is configured to supply power to the load, and the first preset condition includes at least one of the following: a discharge depth of the DC-DC battery reaches a first discharge depth, a remaining power of the DC-DC battery reaches a first remaining power, and the DC-DC battery discharges at the first voltage value for a first preset time length. When a voltage value of the direct current output by the pass-through battery is equal to the second voltage value, the DC-DC battery is configured to output the direct current at the second voltage value to supply power to the load.

[0011] In the embodiments of the present application, when the DC-DC battery is discharging at the first voltage value and the DC-DC battery reaches a first preset condition, the DC-DC conversion circuit is configured to control the DC-DC battery to output a second voltage value, and since the second voltage value is less than the first voltage value, at this time, the pass-through battery starts to supply power to the load. When the voltage value of the direct current output by the pass-through battery reaches the second voltage value, the DC-DC battery starts to supply power to the load at the second voltage value, so that the pass-through battery and the DC-DC battery can alternately supply power to the load. Moreover, since the pass-through battery discharges preferentially to the DC-DC battery, the pass-through battery can discharge as much as possible, and the service life of the DC-DC battery can be prolonged. Furthermore, in most cases, power grid outage is only temporary, that is, the power grid can restore power supply to the load in a short time, that is, the power grid may recover power supply after the pass-through battery discharges for a period of time. In this way, the DC-DC battery does not need to discharge at the second voltage value, so that the service life of the DC-DC battery can be prolonged.

[0012] In addition, in the embodiments of the present application, the pass-through battery discharges preferentially to the DC-DC battery after the DC-DC battery supplies power to the load for a period of time, which is beneficial to the complete preferential discharge of the pass-through battery. After the pass-through battery discharges for a plurality of times, the performance and service life of the pass-through battery decrease, and the pass-through battery can be considered to be offline, that is, the pass-through battery is not used subsequently. In this way, when the power grid is powered off or the power supply of the power grid is insufficient, the DC-DC battery with better performance can be used to supply power to the load, and the reliability of the power supply system for supplying power to the load is improved.

[0013] In conjunction with the first aspect, in one possible design, when the DC-DC battery discharges at a second voltage value and reaches a second preset condition, the DC-DC converter circuit controls the DC-DC battery to output a third voltage value, which is less than the second voltage value. The direct-current battery is then used to power the load. The second preset condition includes at least one of the following: the DC-DC battery's discharge depth reaches a second discharge depth; the remaining charge of the DC-DC battery reaches a second remaining charge; the DC-DC battery discharges at the second voltage value for a second preset duration; the second discharge depth is greater than the first discharge depth; and the second remaining charge is less than the first remaining charge. When the DC voltage output by the direct-current battery equals the third voltage value, the DC-DC battery outputs the third voltage value to power the load.

[0014] In this embodiment, when the DC-DC battery discharges at a second voltage value and reaches a second preset condition, the DC-DC conversion circuit controls the DC-DC battery to output a third voltage value. Since the third voltage value is less than the second voltage value, the direct-current battery begins to supply power to the load. When the DC voltage output by the direct-current battery equals the third voltage value, the DC-DC battery begins to supply power to the load at the third voltage value, thereby enabling the direct-current battery and the DC-DC battery to alternately supply power to the load. Furthermore, since the direct-current battery prioritizes the discharge of the DC-DC battery, it can discharge as much as possible, thus extending the lifespan of the DC-DC battery. Moreover, in most cases, power outages are only temporary, meaning the power grid can restore power to the load within a short time. That is, the power grid may restore power after the direct-current battery has discharged for a period of time, thus eliminating the need for the DC-DC battery to discharge at the third voltage value, thereby extending the lifespan of the DC-DC battery.

[0015] Furthermore, this application designs a system where, after the DC-DC battery supplies power to the load at the second voltage value for a period of time, the through-cell battery discharges preferentially over the DC-DC battery. This ensures the through-cell battery is fully discharged first. After multiple discharges, the performance and lifespan of the through-cell battery decrease, making its discontinuation a viable option. This way, when the mains power fails or becomes insufficient, a higher-performance DC-DC battery can be used to supply power to the load, improving the reliability of the power supply system.

[0016] In conjunction with the first aspect, in one possible design, when the DC-DC battery discharges at the third voltage value and reaches a third preset condition, the DC-DC converter circuit controls the DC-DC battery to output a fourth voltage value, which is less than the third voltage value. The through-cell battery then supplies power to the load. The third preset condition includes at least one of the following: the DC-DC battery's discharge depth reaches a third discharge depth; the DC-DC battery's remaining charge reaches a third remaining charge; the DC-DC battery discharges at the third voltage value for a third preset duration; the third discharge depth is greater than the second discharge depth; and the third remaining charge is less than the second remaining charge. When the DC voltage output by the through-cell battery is equal to the fourth voltage value, the DC-DC battery outputs the fourth voltage value to supply power to the load.

[0017] In this embodiment, when the DC-DC battery discharges at a third voltage value and reaches a third preset condition, the DC-DC conversion circuit controls the DC-DC battery to output a fourth voltage value. Since the fourth voltage value is less than the third voltage value, the direct-current battery begins to supply power to the load. When the DC voltage output by the direct-current battery equals the fourth voltage value, the DC-DC battery begins to supply power to the load at the fourth voltage value, thus enabling the direct-current battery and the DC-DC battery to alternately supply power to the load. Furthermore, since the direct-current battery prioritizes the discharge of the DC-DC battery, it can discharge as much as possible, extending the lifespan of the DC-DC battery. Moreover, in most cases, power outages are only temporary, meaning the power grid can restore power to the load within a short time. That is, the power grid may restore power after the direct-current battery has discharged for a period of time, thus eliminating the need for the DC-DC battery to discharge at the fourth voltage value, thereby extending the lifespan of the DC-DC battery.

[0018] Furthermore, this application designs a system where, after the DC-DC battery supplies power to the load at a third voltage value for a period of time, the through-cell battery discharges preferentially over the DC-DC battery. This ensures the through-cell battery is fully discharged first. After multiple discharges, the performance and lifespan of the through-cell battery decrease, making its discontinuation a viable option. This way, when the mains power fails or becomes insufficient, a higher-performance DC-DC battery can be used to supply power to the load, improving the reliability of the power supply system.

[0019] In conjunction with the first aspect, in one possible design, the first voltage value corresponding to the DC power output by the DC-DC battery is greater than the initial voltage value of the DC power output by the direct-current battery. The DC-DC battery is used to output DC power at the first voltage value to supply power to the load. When the DC-DC battery discharges at the first voltage value and reaches a first preset condition, the DC-DC conversion circuit controls the DC-DC battery to output a second voltage value, which is less than the initial voltage value of the direct-current battery. The direct-current battery is then used to supply power to the load. The first preset condition includes at least one of the following: the depth of discharge of the DC-DC battery reaches a first depth of discharge; the remaining charge of the DC-DC battery reaches a first remaining charge; and the DC-DC battery discharges at the first voltage value for a first preset duration.

[0020] In this embodiment, when the bus voltage is lower than the preset operating voltage, the first voltage value corresponding to the DC output from the DC-DC battery is greater than the initial voltage value of the DC output from the direct-current battery. Therefore, the DC-DC battery prioritizes supplying power to the load via the direct-current battery, maximizing the discharge of the DC-DC battery and extending its lifespan. Furthermore, in most cases, power outages are temporary, meaning the grid can quickly restore power to the load. This implies that the DC-DC battery may discharge for a period before the grid resumes operation, eliminating the need for the direct-current battery to discharge and thus extending its lifespan.

[0021] In conjunction with the first aspect, in one possible design, when the DC voltage output from the direct-current battery equals a second voltage, the DC-DC battery supplies power to the load by outputting DC power at the second voltage. When the DC-DC battery discharges at the second voltage and reaches a second preset condition, the DC-DC converter circuit controls the DC-DC battery to output a third voltage, which is less than the second voltage, and the direct-current battery supplies power to the load. The second preset condition includes at least one of the following: the DC-DC battery's discharge depth reaches a second discharge depth; the remaining charge of the DC-DC battery reaches a second remaining charge; the DC-DC battery discharges at the second voltage for a second preset duration; the second discharge depth is greater than the first discharge depth; and the second remaining charge is less than the first remaining charge.

[0022] In this embodiment, when the DC voltage output from the direct-current battery equals the second voltage value, the DC-DC battery supplies power to the load at the second voltage value. When the DC-DC battery discharges at the second voltage value and reaches the second preset condition, the DC-DC converter circuit controls the DC-DC battery to output a third voltage value. Since the third voltage value is less than the second voltage value, the direct-current battery starts supplying power to the load. This achieves the purpose of alternating discharge between the direct-current battery and the DC-DC battery. Moreover, when the DC voltage output from the direct-current battery equals the second voltage value, the DC-DC battery prioritizes supplying power to the load from the direct-current battery, maximizing the discharge of the DC-DC battery and extending the lifespan of the direct-current battery.

[0023] In conjunction with the first aspect, in one possible design, when the DC voltage output from the direct-current battery equals a third voltage value, the DC-DC battery supplies power to the load by outputting DC power at the third voltage value. When the DC-DC battery discharges at the third voltage value and reaches a third preset condition, the DC-DC converter circuit controls the DC-DC battery to output a fourth voltage value, which is less than the third voltage value, and the direct-current battery supplies power to the load. The third preset condition includes at least one of the following: the DC-DC battery's discharge depth reaches a third discharge depth; the remaining charge of the DC-DC battery reaches a third remaining charge; the DC-DC battery discharges at the third voltage value for a third preset duration; the third discharge depth is greater than the second discharge depth; and the third remaining charge is less than the second remaining charge.

[0024] In this embodiment, when the DC output from the direct-current battery reaches a third voltage value, the DC-DC battery supplies power to the load at the third voltage value. When the DC-DC battery discharges at the third voltage value and reaches a third preset condition, the DC-DC converter circuit controls the DC-DC battery to output a fourth voltage value. Since the fourth voltage value is less than the third voltage value, the direct-current battery begins to supply power to the load, thereby achieving the purpose of alternating discharge between the direct-current battery and the DC-DC battery. Moreover, when the DC output voltage value of the direct-current battery is equal to the third voltage value, the DC-DC battery prioritizes the direct-current battery to supply power to the load, maximizing the discharge of the DC-DC battery and extending the lifespan of the direct-current battery.

[0025] In conjunction with the first aspect, in one possible design, the first voltage value is greater than a preset alarm voltage value, which is used to instruct the power supply system to generate a command to indicate a low voltage alarm for the direct-acting battery or DC-DC battery.

[0026] In this embodiment, since the first voltage value is greater than the preset alarm voltage value, during this discharge stage, the voltage values ​​of the DC power output by the direct-current battery and the DC-DC battery are always greater than the preset low-voltage alarm voltage value. Therefore, the power supply system will not generate an alarm command. This can prevent the situation where the power grid loses power for a short time but the power supply system has already generated an alarm command, thereby avoiding the waste of maintenance resources.

[0027] In conjunction with the first aspect, in one possible design, the second voltage value is less than a preset alarm voltage value, which is used to instruct the power supply system to generate a command indicating a low-voltage alarm for the direct-acting battery or DC-DC battery. The power supply system is configured to: generate a command indicating a low-voltage alarm for the direct-acting battery or DC-DC battery when the direct-acting battery or DC-DC battery supplies power to the load at the second voltage value.

[0028] In this embodiment, since the second voltage value is less than the preset alarm voltage value, when the DC voltage value output by the direct-current battery reaches the second voltage value and the DC-DC battery starts supplying power to the load at the second voltage value, the DC voltage values ​​output by the direct-current battery and the DC-DC battery will reach the preset alarm voltage value. The power supply system will then generate a command to indicate a low-voltage alarm for the direct-current battery or the DC-DC battery, so as to notify maintenance personnel to perform maintenance on the power grid as soon as possible. This can prevent the power supply system from failing to generate an alarm command in a timely manner when the direct-current battery and the DC-DC battery are alternately supplying power to the load, thereby improving the performance and lifespan of the direct-current battery and the DC-DC battery.

[0029] In conjunction with the first aspect, in one possible design, the third voltage value is less than a preset LLVD voltage value, which is used to instruct the power supply system to disconnect a portion of the load from the bus. The power supply system is used to disconnect a portion of the load from the bus when the load is supplied with power by a direct-acting battery or DC-DC battery at the third voltage value.

[0030] In this embodiment, since the third voltage value is less than the preset LLVD voltage value, when the voltage value supplied to the load reaches the third voltage value, the power supply system can disconnect part of the load from the bus, thereby directly supplying power to the remaining load via the battery or DC-DC battery, which can extend the duration of the power supply system supplying power to the remaining load.

[0031] In conjunction with the first aspect, in one possible design, the fourth voltage value is less than a preset BLVD voltage value, which is used to instruct the power supply system to control the direct-current battery or DC-DC battery to stop outputting DC power. The power supply system is used to: control the direct-current battery or DC-DC battery to stop outputting DC power when the voltage value of the DC power output by the direct-current battery or DC-DC battery reaches the fourth voltage value.

[0032] In this embodiment of the application, when the voltage value supplied to the load reaches the fourth voltage value, since the fourth voltage value is less than the preset BLVD voltage value, the power supply system can disconnect the load from the bus, thereby stopping the power supply system from supplying power to the load, which can reduce the depth of discharge of the direct-acting battery or DC-DC battery, thereby extending the service life of the direct-acting battery or DC-DC battery.

[0033] In conjunction with the first aspect, in one possible design, the power supply system is used to: disconnect a portion of the load on the currently connected bus from the bus each time the through battery replaces the DC-DC battery to power the load, or each time the DC-DC battery replaces the through battery to power the load.

[0034] In this embodiment of the application, each time the direct-current battery replaces the DC-DC battery to power the load, or each time the DC-DC battery replaces the direct-current battery to power the load, the power supply system can disconnect part of the load currently connected to the bus from the bus. In this way, the power supply system can extend the power supply time to important loads as much as possible and ensure the reliability of the power supply system to important loads as much as possible.

[0035] Secondly, a DC-DC battery is provided, comprising a cell pack and a DC-DC conversion circuit. The DC-DC conversion circuit converts the voltage output from the cell pack and outputs the converted voltage to a load via a bus. The DC-DC conversion circuit is used to: convert the voltage output from the cell pack to a first voltage value when the voltage at the DC-DC battery output port is less than a preset operating voltage value; and convert the voltage output from the cell pack to a second voltage value when the DC-DC battery reaches a first preset condition, wherein the second voltage value is less than the first voltage value. The first preset condition includes at least one of the following: the depth of discharge of the DC-DC battery reaches a first depth of discharge; the remaining capacity of the DC-DC battery reaches a first remaining capacity; and the discharge duration of the DC-DC battery reaches a first preset duration.

[0036] In this embodiment, when the voltage at the output port of the DC-DC battery is lower than a preset operating voltage, the DC-DC battery supplies power to the load, ensuring continuous power supply to the load. The DC-DC converter circuit can convert the voltage output from the battery pack into a first voltage value, so that the DC-DC battery supplies power to the load at the first voltage value. When the DC-DC battery discharges at the first voltage value and reaches a first preset condition, the DC-DC converter circuit converts the voltage output from the battery pack into a second voltage value. Since the second voltage value is lower than the first voltage value, over-discharge of the DC-DC battery can be avoided, thereby improving the performance and lifespan of the DC-DC battery.

[0037] In one example, a first voltage value can be set to be greater than a preset low-voltage alarm voltage value. When the DC-DC battery supplies power to the load at the first voltage value, since the first voltage value corresponding to the DC output of the DC-DC battery is always greater than the preset alarm voltage value, the power supply system will not generate an alarm command when the DC-DC battery supplies power to the load at the first voltage value. This can prevent situations where the power grid experiences a short-term power outage but the power supply system has already generated an alarm command, thereby avoiding the waste of maintenance resources.

[0038] In another example, the second voltage value can be set to be less than the preset low-voltage alarm voltage value. Then, the DC-DC converter circuit converts the voltage value output by the battery pack into the second voltage value. Since the second voltage value is less than the preset low-voltage alarm voltage value, the power supply system can generate an alarm command to notify maintenance personnel to perform grid maintenance as soon as possible.

[0039] In conjunction with the second aspect, in one possible design, the DC-DC converter circuit is also used to: convert the voltage value output by the battery pack into a different voltage value at regular intervals, wherein the voltage value after conversion by the DC-DC converter circuit is less than the voltage value before conversion by the DC-DC converter circuit, and the voltage value output by the DC-DC converter circuit remains constant within each interval.

[0040] In the embodiments of this application, during the discharge process, the DC-DC battery supplies power to the load at different voltage values. Each time the DC-DC conversion circuit converts the voltage value output by the battery pack to a different voltage value, since the voltage value after each conversion by the DC-DC conversion circuit is less than the voltage value before the conversion, this can extend the duration of the DC-DC battery supplying power to the important load as much as possible, and ensure reliable power supply to the important load. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a base station provided in an embodiment of this application.

[0042] Figure 2 This is a schematic diagram of a power supply system provided in an embodiment of this application.

[0043] Figure 3 This is a schematic diagram of the discharge curve of a power supply system provided in an embodiment of this application.

[0044] Figure 4 This is a schematic diagram of the discharge curve of another power supply system provided in an embodiment of this application.

[0045] Figure 5 This is a schematic diagram of the discharge curve of another power supply system provided in an embodiment of this application.

[0046] Figure 6 This is a schematic diagram of a DC-DC battery provided in an embodiment of this application.

[0047] Figure 7 This is a schematic diagram of the discharge curve of a DC-DC battery provided in an embodiment of this application.

[0048] Figure 8 This is a schematic diagram of the discharge curve of another DC-DC battery provided in an embodiment of this application. Detailed Implementation

[0049] To facilitate understanding of this application, the following section will first explain any terms that may be involved.

[0050] Low voltage alarm voltage value: When the mains power fails, the battery takes over the power supply. When the output voltage of the battery cell pack reaches a certain level, the output voltage of the cell pack will be low, indicating that the remaining usable power is low. The power supply system will generate a low voltage alarm command to remind users that the remaining usable time is limited and there is a risk of load power loss.

[0051] Load low voltage disconnection (LLVD): When the mains power fails, the battery takes over the power supply. If the mains power supply is not restored after the battery has been supplying power for a period of time, in order to extend the power supply to the main load, it is necessary to disconnect the power supply to the secondary load. This process is called load low voltage disconnection, and the corresponding voltage value is the load low voltage disconnection voltage value.

[0052] Battery low voltage disconnection (BLVD): When a battery discharges to a certain level and cannot continue to discharge, it is necessary to disconnect the battery from all loads. This action is called battery low voltage disconnection, and the corresponding voltage value is the battery low voltage disconnection voltage value.

[0053] It should be understood that in some embodiments, the aforementioned low-voltage alarm voltage value, LLVD, and BLVD may be referred to by other names, but with the same meaning. Therefore, names with the same meaning as the terms mentioned above in the embodiments of this application can also be applied to this application.

[0054] To facilitate understanding of the embodiments of this application, the following points will be explained before introducing the embodiments of this application.

[0055] In the description of the embodiments of this application, "electrical connection" can be understood as the transmission of signals between two electrical components through direct or indirect electrical connection. For example, an electrical connection between A and B can be understood as a direct electrical connection between A and B, or as an indirect electrical connection between A and B through one or more other electrical components.

[0056] In the description of the embodiments of this application, unless otherwise stated, "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0057] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more, and "at least one" and "one or more" refer to one, two, or more than two.

[0058] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0059] First, to facilitate understanding of the power module provided in the embodiments of this application, the application scenarios of the power module will be introduced below.

[0060] The power module provided in this application embodiment can be applied to the communication device of a base station to supply power to the load in the communication device. The base station can be, for example, a base station in a convergence room, communication room, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5th generation (5G) system, new radio (NR) system, wireless-fidelity (WiFi) system, or other communication systems.

[0061] Figure 1 This is a schematic diagram of the structure of a base station 10 applied in a 5G communication system according to an embodiment of this application.

[0062] See Figure 1 The base station 10 may include a baseband unit (BBU) (not shown in the figure), an RRU 11, an AAU 12, an antenna device 13, and a power supply device 14.

[0063] The BBU can be connected to RRU11 and AAU12 via optical fiber. The BBU is the core equipment in base station 10, mainly responsible for the processing and modulation of digital signals, and transmitting the processed digital signals to RRU11 and AAU12 via optical fiber.

[0064] RRU11 can be electrically connected to antenna device 13 via feeder 16. RRU11 is mainly responsible for modulating the digital signal from BBU into a radio frequency (RF) signal and amplifying it, then transmitting the amplified RF signal to antenna device 13 via feeder 16, whereby antenna device 13 transmits the RF signal. Alternatively, RRU11 can also receive RF signals from antenna device 13 via feeder 16, demodulate the RF signal, and then transmit it to BBU.

[0065] The RRU11 typically includes an intermediate frequency (IF) unit, a trunking unit (TRU) unit, a power amplifier unit, and a power supply unit. The IF unit performs modulation and demodulation, digital up / down conversion, and D / A conversion on the digital signal, converting it into an IF analog signal. The TRU unit converts this IF analog signal into a radio frequency (RF) signal. The power amplifier unit amplifies the RF signal. The power supply unit supplies power to the TRU and power amplifier units.

[0066] AAU12 can be formed by integrating RRU11 and part of antenna equipment 13 into one unit, thus combining the structure and function of RRU11 and antenna equipment 13.

[0067] Power supply unit 14 can be connected to BBU, RRU11, and AAU12 via bus 15 to supply power to BBU, RRU11, and AAU12. Power supply unit 14 may include an alternating current-to-direct current (AC-DC) converter to convert the AC voltage value from the power grid (e.g., 220V AC mains power) into a negative DC voltage value before supplying it to BBU, RRU11, and AAU12. Alternatively, power supply unit 14 may also include a DC battery to directly provide a negative DC voltage value to BBU, RRU11, and AAU12. In addition, battery 17 can also supply power to BBU, RRU11, and AAU12 via bus 15.

[0068] The rated negative DC voltage supplied by power supply unit 14 to BBU, RRU11, and AAU12 is generally -48V, and can fluctuate within the range of -34V to -60V. Understandably, the negative DC voltage supplied by power supply unit 14 can be flexibly adjusted according to actual production and design requirements; for example, it can also provide a rated negative DC voltage of -36V or -60V, and is allowed to fluctuate within a certain range.

[0069] It should be understood that the above Figure 1 This is merely one example; in one possible instance, the battery 17 and the power supply unit 14 can be an integrated device, thereby Figure 1 It includes only the power supply unit 14, which supplies power to the BBU, RRU11 and AAU12.

[0070] In practical use, such as Figure 1 As shown, base station 10 can be a distributed base station. RRU 11, AAU 12, and antenna equipment 13 can be installed on the top of tower 20; alternatively, RRU 11, AAU 12, and antenna equipment 13 can be installed on a rooftop 30, or at other high locations such as mountains. BBU and power supply unit 14 can be installed on the top of tower 20 or in a remote equipment room 40.

[0071] It is understood that the structure of base station 10 described above is merely illustrative. Depending on the actual application scenario, base station 10 may include more or fewer communication devices than described above. For example, base station 10 may include only one of RRU11 and AAU12.

[0072] As mentioned above, battery 17 can also supply power to BBU, RRU11 and AAU12 through bus 15. Initially, lead-acid batteries were widely used in communication base stations due to their earlier development and mature technology. However, lead-acid batteries have a small capacity and a short lifespan. In harsh environments, the actual output power and lifespan of some lead-acid batteries may be even lower, which may affect the normal power consumption of the load when the power grid fails.

[0073] Based on this, this application provides a power supply system including a direct current battery and a direct current-direct current (DC-DC) battery. When the power grid is abnormal and cannot supply power to the load, both the direct current battery and the DC-DC battery can supply power to the load. Compared with the direct current battery, the DC-DC battery has better performance and longer life, thus ensuring the normal power supply of the load when the power grid is abnormal, thereby improving the reliability of the load's power supply when the power grid is abnormal.

[0074] like Figure 2 As shown, the power supply system 200 includes a direct-flow battery 210 and a DC-DC battery 220. The DC-DC battery 220 includes a cell pack 221 and a DC-DC conversion circuit 222. Both the direct-flow battery 210 and the DC-DC battery 220 are used to supply power to the load through the bus.

[0075] When the bus voltage is lower than the preset operating voltage, and the DC voltage output from the direct-current battery 210 is greater than the DC voltage output from the DC-DC battery 220, the direct-current battery 210 supplies power to the load; when the DC voltage output from the direct-current battery 210 is less than the DC voltage output from the DC-DC battery 220, the DC-DC battery 220 supplies power to the load. The DC-DC converter circuit 222 converts the voltage output from the battery pack 221 so that the direct-current battery 210 and the DC-DC battery 220 can alternately supply power to the load multiple times.

[0076] In this embodiment, when the power grid supplies power to the load through the bus, the AC power output from the power grid is input to the AC-DC conversion circuit. The AC-DC conversion circuit converts the AC power into DC power and then supplies power to the load through the bus. Therefore, the voltage value of the bus is the voltage value output by the AC-DC conversion circuit. When the voltage value of the bus is less than the preset operating voltage value, it indicates an abnormality in the power grid. Based on this situation, to ensure continuous power supply to the load, the direct-connect battery 210 or the DC-DC battery 220 in the power supply system 200 can release electrical energy to supply power to the load, achieving the purpose of continuous power supply to the load.

[0077] It should be understood that the preset operating voltage value in this application embodiment is the voltage value of the bus when the power grid supplies power to the load through the bus. For example, assuming the voltage value of the bus when the power grid supplies power to the load through the bus is 54V, then the preset operating voltage value is 54V. When the bus voltage value is less than 54V, it indicates that the power grid is abnormal. If the power grid continues to supply power to the load, it may affect the normal power consumption of the load, and in severe cases, it may damage the load. Therefore, when the bus voltage value is less than the preset operating voltage value, both the direct-acting battery 210 and the DC-DC battery 220 can supply power to the load, which can ensure the normal power consumption of the load when the power grid is abnormal. Moreover, since the DC-DC battery 220 has better performance and longer life, compared with the scheme of the direct-acting battery 210 supplying power to the load alone, this application designs the direct-acting battery and the DC-DC battery to supply power to the load alternately, which can further ensure the normal power consumption of the load when the power grid is abnormal, thereby improving the reliability of the load's power consumption when the power grid is abnormal.

[0078] Furthermore, in this embodiment, when the bus voltage is lower than the preset operating voltage, the DC-DC converter circuit 222 converts the voltage output from the battery pack 221, enabling the direct-current battery 210 and the DC-DC battery 220 to alternately supply power to the load multiple times. This differs from the previous approach where one battery in the direct-current battery 210 or DC-DC battery 220 is almost completely discharged before the other is used to supply power to the load. The design of alternating power supply between the direct-current battery 210 and the DC-DC battery 220 avoids the impact on the performance and lifespan of the battery caused by one battery being almost completely discharged, thus improving the performance and lifespan of the direct-current battery 210 and the DC-DC battery 220.

[0079] Specifically, in one implementation, when the mains power fails, the direct-current battery 210 can prioritize supplying power to the load via the DC-DC battery 220. For example, when the mains power fails, the direct-current battery 210 supplies power to the load first. After the direct-current battery 210 supplies power to the load for a period of time, the DC-DC battery 220 then supplies power to the load. After the DC-DC battery 220 supplies power to the load for a period of time, the direct-current battery 210 then supplies power to the load again. This process, where the direct-current battery 210 and the DC-DC battery 220 alternately supply power to the load multiple times, ensures continuous power supply to the load, and avoids the impact on the performance of one battery (either the direct-current battery 210 or the DC-DC battery 220) from being completely depleted, thus extending the lifespan of both batteries.

[0080] In another implementation, when the mains power fails, the DC-DC battery 220 can preferentially supply power to the load via the direct-supply battery 210. For example, when the mains power fails, the DC-DC battery 220 supplies power to the load first. After the DC-DC battery 220 supplies power to the load for a period of time, the direct-supply battery 210 supplies power to the load again. After the direct-supply battery 210 supplies power to the load for a period of time, the DC-DC battery 220 supplies power to the load again. After the DC-DC battery 220 supplies power to the load for a period of time, the direct-supply battery 210 supplies power to the load again, and so on. In this way, the DC-DC battery 220 and the direct-supply battery 210 can alternately supply power to the load multiple times, ensuring continuous power supply to the load. It can also avoid the impact on the performance of the battery caused by the depletion of the power in either the direct-supply battery 210 or the DC-DC battery 220, thereby extending the lifespan of the direct-supply battery 210 and the DC-DC battery 220.

[0081] It should be noted that, in this embodiment, the direct-current battery 210 supplying power to the load can be understood as the DC current output by the direct-current battery 210 flowing into the load. In other words, the load can operate normally when the DC current output by the direct-current battery 210 flows into the load. Similarly, the DC-DC battery 220 supplying power to the load can be understood as the DC current output by the DC-DC battery 220 flowing into the load. Likewise, the load can operate normally when the DC current output by the DC-DC battery 220 flows into the load.

[0082] The following will combine Figure 3 and Figure 4 The explanation will be provided according to the specific circumstances.

[0083] In one embodiment, the initial voltage value of the DC power output by the direct-current battery 210 is greater than the first voltage value corresponding to the DC power output by the DC-DC battery 220, and the direct-current battery 210 is used to supply power to the load. When the voltage value of the DC power output by the direct-current battery 210 is equal to the first voltage value, the DC-DC battery 220 is used to output DC power of the first voltage value to supply power to the load.

[0084] In this embodiment, since the initial voltage value of the DC power output by the direct-current battery 210 is greater than the first voltage value corresponding to the DC power output by the DC-DC battery 220, when the bus voltage value is less than the preset operating voltage value, the direct-current battery 210 prioritizes the DC-DC battery 220 to supply power to the load. Specifically, refer to... Figure 3 Taking an initial DC voltage of 52V from the direct-current battery 210 as an example, the first voltage value is less than 52V, such as 50V. Thus, when the bus voltage is less than the preset operating voltage, the direct-current battery 210 prioritizes supplying power to the load. As the direct-current battery 210 continues to supply power to the load, its output voltage continuously decreases. When the output voltage of the direct-current battery 210 reaches 50V, the DC-DC battery 220 begins supplying power to the load at the first voltage value of 50V. This is because when the output voltage of the direct-current battery 210 reaches 50V, the DC voltage output by the direct-current battery 210 is equal to the DC voltage output by the DC-DC battery 220. When the DC voltage output by the direct-current battery 210 is slightly lower than the first voltage value, the current from the DC voltage output by the DC-DC battery 220 flows into the load, thus the DC-DC battery 220 begins supplying power to the load. At this time, although the direct-current battery 210 outputs DC power, the current of the DC power output by the direct-current battery 210 does not flow into the load. Therefore, when the DC-DC battery 220 supplies power to the load, the direct-current battery 210 does not supply power to the load.

[0085] In this embodiment, if the initial voltage of the DC power output from the direct-current battery 210 is greater than the first voltage value corresponding to the DC power output from the DC-DC battery 220, then the voltage value on the bus is less than the preset operating voltage value. The direct-current battery 210 prioritizes the DC-DC battery 220 to supply power to the load. When the voltage value of the DC power output from the direct-current battery 210 reaches the first voltage value, the DC-DC battery 220 begins to supply power to the load at the first voltage value. This allows the direct-current battery and the DC-DC battery to alternately supply power to the load. Furthermore, since the direct-current battery prioritizes the discharge of the DC-DC battery, it allows the direct-current battery to discharge as much as possible, extending the lifespan of the DC-DC battery. Moreover, in most cases, power outages are only temporary, meaning the power grid can restore power to the load within a short time. This means that the power grid may restore power after the direct-current battery has discharged for a period of time, thus eliminating the need for the DC-DC battery to discharge at the first voltage value, thereby extending the lifespan of the DC-DC battery.

[0086] Furthermore, this application design prioritizes the discharge of the DC-DC battery 220 by the direct-current battery 210 during a power outage. This ensures the complete discharge of the direct-current battery 210. After multiple discharges, the performance and lifespan of the direct-current battery 210 decrease, making its discontinuation a viable option. Thus, when subsequent power outages or insufficient grid power occur, a higher-performance DC-DC battery can be used to power the load, improving the reliability of the power supply system.

[0087] In one embodiment, when the DC-DC battery 220 discharges at a first voltage value and reaches a first preset condition, the DC-DC conversion circuit controls the DC-DC battery 220 to output a second voltage value, which is less than the first voltage value, and the direct-connect battery 210 is used to supply power to the load. When the voltage value of the DC power output by the direct-connect battery 210 is equal to the second voltage value, the DC-DC battery 220 outputs DC power at the second voltage value to supply power to the load. The first preset condition includes at least one of the following: the depth of discharge of the DC-DC battery 220 reaches a first depth of discharge; the remaining charge of the DC-DC battery 220 reaches a first remaining charge; and the discharge duration of the DC-DC battery 220 is a first preset duration.

[0088] In this embodiment, the second voltage value is less than the first voltage value, so that when the DC-DC battery 220 discharges at the first voltage value and the DC-DC battery reaches the first preset condition, the direct-connect battery 210 starts supplying power to the load again. Specifically, refer to the above. Figure 3If the first voltage value is 49.7V, the second voltage value can be set to a value less than 49.7V, for example, 47.1V. When the DC-DC battery discharges at the first voltage value and the DC-DC battery 220 reaches the first precondition, the DC-DC converter circuit controls the DC-DC battery 220 to output the second voltage value. Since the second voltage value is less than the first voltage value, that is, the DC voltage output by the DC-DC battery is less than the DC voltage output by the direct-current battery 210, the DC voltage output by the direct-current battery 210 is greater than the DC voltage output by the DC-DC battery, thus the direct-current battery 210 begins to supply power to the load. As the direct-current battery 210 continues to supply power to the load, the voltage output by the direct-current battery 210 continuously decreases. When the voltage output by the direct-current battery 210 reaches the second voltage value of 47.1V, the DC-DC battery 220 begins to supply power to the load at the second voltage value of 47.1V. The specific reasons are similar to those described above and will not be repeated.

[0089] The first preset condition may include at least one of the above. Taking the discharge depth of DC-DC battery 220 reaching the first discharge depth as an example, assuming the first discharge depth is 50%, when the DC-DC battery discharges at the first voltage value and the discharge depth of DC-DC battery 220 is 50%, the DC-DC conversion circuit controls DC-DC battery 220 to output the second voltage value so that the direct-through battery 210 starts to supply power to the load.

[0090] In this embodiment, when the DC-DC battery 220 discharges at a first voltage value and reaches a first preset condition, the DC-DC conversion circuit controls the DC-DC battery 220 to output a second voltage value. Since the second voltage value is less than the first voltage value, the direct-current battery begins to supply power to the load. When the DC voltage output by the direct-current battery equals the second voltage value, the DC-DC battery 220 begins to supply power to the load at the second voltage value, thereby enabling the direct-current battery 210 and the DC-DC battery 220 to alternately supply power to the load. Furthermore, since the direct-current battery prioritizes the discharge of the DC-DC battery, it can discharge as much as possible, thus extending the lifespan of the DC-DC battery. Moreover, in most cases, power outages are only temporary, meaning the power grid can restore power to the load within a short time. That is to say, the power grid may restore power after the direct-current battery has discharged for a period of time, thus eliminating the need for the DC-DC battery to discharge at the second voltage value, thereby extending the lifespan of the DC-DC battery.

[0091] Furthermore, this application designs a system where, after the DC-DC battery supplies power to the load at a first voltage value for a period of time, the through-cell battery discharges preferentially over the DC-DC battery. This ensures the through-cell battery is fully discharged first. After multiple discharges, the performance and lifespan of the through-cell battery decrease, making its discontinuation a viable option. This way, when the mains power fails or becomes insufficient, a higher-performance DC-DC battery can be used to supply power to the load, improving the reliability of the power supply system.

[0092] In one embodiment, when the DC-DC battery 220 discharges at a second voltage value and the DC-DC battery 220 reaches a second preset condition, the DC-DC conversion circuit controls the DC-DC battery 220 to output a third voltage value, which is less than the second voltage value, and the direct-connect battery 210 is used to supply power to the load. When the voltage value of the DC power output by the direct-connect battery 210 is equal to the third voltage value, the DC-DC battery 220 is used to output DC power at the third voltage value to supply power to the load. The second preset condition includes at least one of the following: the depth of discharge of the DC-DC battery 220 reaches a second depth of discharge; the remaining charge of the DC-DC battery 220 reaches a second remaining charge; the discharge duration of the DC-DC battery 220 reaches a second preset duration; the second depth of discharge is greater than the first depth of discharge; and the second remaining charge is less than the first remaining charge.

[0093] In this embodiment, the third voltage value is lower than the second voltage value, so that when the DC-DC battery 220 discharges at the second voltage value and the DC-DC battery reaches the second preset condition, the direct-connect battery 210 starts supplying power to the load again. Specifically, refer to the above. Figure 3 Assuming the second voltage value is 47.1V, the third voltage value can be set to a value less than 47.1V, for example, 44.8V. Thus, when the DC-DC battery 220 discharges at the second voltage value and reaches the second preset condition, the DC-DC converter circuit controls the DC-DC battery 220 to output the third voltage value. Since the third voltage value is less than the second voltage value, that is, the DC voltage output by the DC-DC battery is less than the DC voltage output by the direct-acting battery 210, the DC voltage output by the direct-acting battery 210 is greater than the DC voltage output by the DC-DC battery. Therefore, the direct-acting battery 210 begins to supply power to the load. As the direct-acting battery 210 continues to supply power to the load, the voltage output by the direct-acting battery 210 continuously decreases. When the voltage output by the direct-acting battery 210 reaches 44.8V, the DC-DC battery 220 begins to supply power to the load at the third voltage value of 44.8V.

[0094] The second preset condition includes at least one of the above. Taking the discharge depth of DC-DC battery 220 reaching the second discharge depth as an example, assuming the second discharge depth is 80%, when DC-DC battery 220 discharges at the second voltage value and the discharge depth of DC-DC battery 220 is 80%, the DC-DC conversion circuit controls DC-DC battery 220 to output a third voltage value so that the direct-through battery 210 starts to supply power to the load.

[0095] In this embodiment, when the DC-DC battery 220 discharges at a second voltage value and reaches a second preset condition, the DC-DC converter circuit controls the DC-DC battery 220 to output a third voltage value. Since the third voltage value is less than the second voltage value, the direct-current battery begins to supply power to the load. When the DC voltage output by the direct-current battery equals the third voltage value, the DC-DC battery 220 begins to supply power to the load at the third voltage value, thereby enabling the direct-current battery and the DC-DC battery to alternately supply power to the load. Furthermore, since the direct-current battery prioritizes the discharge of the DC-DC battery, it can discharge as much as possible, thus extending the lifespan of the DC-DC battery. Moreover, in most cases, power outages are only temporary, meaning the power grid can restore power to the load within a short time. That is to say, the power grid may restore power after the direct-current battery has discharged for a period of time, thus eliminating the need for the DC-DC battery to discharge at the third voltage value, thereby extending the lifespan of the DC-DC battery.

[0096] Furthermore, this application designs a system where, after the DC-DC battery supplies power to the load at the second voltage value for a period of time, the through-cell battery discharges preferentially over the DC-DC battery. This ensures the through-cell battery is fully discharged first. After multiple discharges, the performance and lifespan of the through-cell battery decrease, making its discontinuation a viable option. This way, when the mains power fails or becomes insufficient, a higher-performance DC-DC battery can be used to supply power to the load, improving the reliability of the power supply system.

[0097] In one embodiment, when the DC-DC battery 220 discharges at a third voltage value and reaches a third preset condition, the DC-DC converter circuit controls the DC-DC battery 220 to output a fourth voltage value, which is less than the third voltage value. The direct-connect battery 210 then supplies power to the load. The third preset condition includes at least one of the following: the depth of discharge of the DC-DC battery 220 reaches a third depth of discharge; the remaining charge of the DC-DC battery 220 reaches a third remaining charge; the DC-DC battery 220 discharges at the third voltage value for a third preset duration; the third depth of discharge is greater than the second depth of discharge; and the third remaining charge is less than the second remaining charge. When the voltage value of the DC power output by the direct-connect battery 210 is equal to the fourth voltage value, the DC-DC battery 220 supplies power to the load by outputting the fourth voltage value of DC power.

[0098] In this embodiment, the fourth voltage value is less than the third voltage value. Therefore, when the DC-DC battery 220 discharges at the third voltage value and the DC-DC battery reaches the third preset condition, the direct-connect battery 210 resumes power supply to the load. Specifically, refer to the above description. Figure 3 Assuming the third voltage value is 44.8V, it can be set to a value less than 44.8V, such as 42V. When the DC-DC battery 220 discharges at the third voltage value and reaches the third preset condition, the DC-DC converter circuit controls the DC-DC battery 220 to output a fourth voltage value. Since the fourth voltage value is less than the third voltage value, meaning the DC voltage output by the DC-DC battery is less than the DC voltage output by the direct-acting battery 210, the direct-acting battery 210 outputs a higher DC voltage than the DC-DC battery. Therefore, the direct-acting battery 210 begins to supply power to the load. As the direct-acting battery 210 continues to supply power to the load, its output voltage continuously decreases. When the output voltage of the direct-acting battery 210 reaches 42V, the DC-DC battery 220 begins to supply power to the load at the third voltage value of 42V.

[0099] The third preset condition includes at least one of the above. Taking the discharge depth of DC-DC battery 220 reaching the third discharge depth as an example, assuming the third discharge depth is 98%, when DC-DC battery 220 discharges at the third voltage value and the discharge depth of DC-DC battery 220 is 98%, the DC-DC conversion circuit controls DC-DC battery 220 to output the fourth voltage value so that the direct-through battery 210 starts to supply power to the load.

[0100] In this embodiment, when the DC-DC battery 220 discharges at a third voltage value and reaches a third preset condition, the DC-DC converter circuit controls the DC-DC battery 220 to output a fourth voltage value. Since the fourth voltage value is less than the third voltage value, the direct-current battery begins to supply power to the load. When the DC voltage output by the direct-current battery equals the fourth voltage value, the DC-DC battery 220 begins to supply power to the load at the fourth voltage value, thereby enabling the direct-current battery and the DC-DC battery to alternately supply power to the load. Furthermore, since the direct-current battery prioritizes the discharge of the DC-DC battery, it can discharge as much as possible, thus extending the lifespan of the DC-DC battery. Moreover, in most cases, power outages are only temporary, meaning the power grid can restore power to the load within a short time. That is to say, the power grid may restore power after the direct-current battery has discharged for a period of time, thus eliminating the need for the DC-DC battery to discharge at the fourth voltage value, thereby extending the lifespan of the DC-DC battery.

[0101] Furthermore, this application designs a system where, after the DC-DC battery supplies power to the load at a third voltage value for a period of time, the through-cell battery discharges preferentially over the DC-DC battery. This ensures the through-cell battery is fully discharged first. After multiple discharges, the performance and lifespan of the through-cell battery decrease, making its discontinuation a viable option. This way, when the mains power fails or becomes insufficient, a higher-performance DC-DC battery can be used to supply power to the load, improving the reliability of the power supply system.

[0102] It should be understood that the above Figure 3 The illustration shows the direct-connect battery 210 and DC-DC battery 220 at full charge when the mains power fails. In some examples, the direct-connect battery 210 or DC-DC battery 220 may not reach full charge when the mains power fails. In this example, the voltage value of the bus is less than the preset operating voltage value. The direct-connect battery 210 may directly enter the second discharge stage, i.e., discharge stage T1 shown in the figure. When the voltage value of the DC power output by the direct-connect battery 210 reaches the second voltage value V2, the DC-DC battery 220 starts to supply power to the load at the second voltage value.

[0103] The following text combines Figure 4 This section describes the specific process by which the DC-DC battery 220 prioritizes direct power supply to the load via the battery 210 when the mains power fails.

[0104] In one embodiment, the first voltage value corresponding to the DC power output by the DC-DC battery 220 is greater than the initial voltage value of the DC power output by the direct-current battery 210. The DC-DC battery 220 is used to output DC power at the first voltage value to supply power to the load. When the DC-DC battery 220 discharges at the first voltage value and the DC-DC battery 220 reaches a first preset condition, the DC-DC conversion circuit is used to control the DC-DC battery 220 to output a second voltage value, which is less than the initial voltage value of the direct-current battery 210. The direct-current battery 210 is used to supply power to the load. The first preset condition includes at least one of the following: the depth of discharge of the DC-DC battery 220 reaches a first depth of discharge; the remaining charge of the DC-DC battery 220 reaches a first remaining charge; and the discharge duration of the DC-DC battery 220 is a first preset duration.

[0105] In this embodiment, since the first voltage value corresponding to the DC power output by the DC-DC battery 220 is greater than the initial voltage value of the DC power output by the direct-connect battery 210, when the bus voltage value is less than the preset operating voltage value, the DC-DC battery 220 preferentially supplies power to the load through the direct-connect battery 210. Specifically, refer to... Figure 4 Taking the initial discharge voltage of the direct-connect battery 210 as an example (52V), the first voltage value can be set to a value greater than 52V, such as 52.2V. Thus, when the bus voltage is less than the preset operating voltage, the DC-DC battery 220 prioritizes power supply to the load. When the DC-DC battery 220 reaches the first preset condition, the DC-DC converter circuit controls the DC-DC battery 220 to output a second voltage value. Since the second voltage value is less than the first voltage value (for example, the second voltage value can be set to 48.3V), the DC voltage output by the direct-connect battery 210 is greater than the DC voltage output by the DC-DC battery. Therefore, the direct-connect battery 210 begins to supply power to the load, thus achieving the goal of prioritizing the discharge of the DC-DC battery 220 when the mains power fails.

[0106] Similarly, the first preset condition includes at least one of the above. Taking the discharge depth of DC-DC battery 220 reaching the first discharge depth as an example, assuming the first discharge depth is 50%, when the DC-DC battery discharges at the first voltage value and the discharge depth of DC-DC battery 220 is 50%, the DC-DC conversion circuit controls DC-DC battery 220 to output the second voltage value so that the direct-through battery 210 starts to supply power to the load.

[0107] In this embodiment, when the bus voltage is lower than the preset operating voltage, and the first voltage value corresponding to the DC output from the DC-DC battery 220 is greater than the initial voltage value of the DC output from the direct-connect battery, the DC-DC battery prioritizes supplying power to the load via the direct-connect battery, maximizing the discharge of the DC-DC battery and extending its lifespan. Furthermore, in most cases, power outages can be restored quickly. In such situations, the DC-DC battery may discharge for a period before the power grid is restored, eliminating the need for the direct-connect battery to discharge and further extending its lifespan.

[0108] In one embodiment, when the voltage value of the DC power output by the direct-current battery 210 reaches a second voltage value, the DC-DC battery 220 is used to output DC power at the second voltage value to supply power to the load; when the DC-DC battery 220 discharges at the second voltage value and the DC-DC battery reaches a second preset condition, the DC-DC conversion circuit is used to control the DC-DC battery to output a third voltage value, the third voltage value being less than the second voltage value, and the direct-current battery is used to supply power to the load. The second preset condition includes at least one of the following: the depth of discharge of the DC-DC battery 220 reaches a second depth of discharge; the remaining charge of the DC-DC battery 220 reaches a second remaining charge; the discharge duration of the DC-DC battery 220 reaches a second preset duration; the second depth of discharge is greater than the first depth of discharge; and the second remaining charge is less than the first remaining charge.

[0109] In the embodiments of this application, reference is made to the above. Figure 4 If the second voltage value is 48.3V, as the direct-current battery 210 discharges, the DC voltage output by the direct-current battery 210 gradually decreases. When the DC voltage output by the direct-current battery 210 reaches the second voltage value of 48.3V, the DC-DC battery 220 begins to supply power to the load at the second voltage value. When the DC-DC battery 220 discharges at the second voltage value and reaches the second preset condition, the DC-DC converter circuit controls the DC-DC battery 220 to output a third voltage value. Since the third voltage value is less than the second voltage value, that is, the DC voltage output by the DC-DC battery is less than the DC voltage output by the direct-current battery 210, the DC voltage output by the direct-current battery 210 is greater than the DC voltage output by the DC-DC battery, thus the direct-current battery 210 begins to supply power to the load. In this way, the purpose of alternating discharge between the direct-current battery and the DC-DC battery can be achieved. Furthermore, when the voltage of the DC power output from the direct-current battery is equal to the second voltage value, the DC-DC battery prioritizes the direct-current battery to power the load, maximizing the discharge of the DC-DC battery and extending its lifespan.

[0110] In one embodiment, when the voltage value of the DC power output by the direct-current battery 210 is equal to a third voltage value, the DC-DC battery 220 is used to output DC power at the third voltage value to supply power to the load; when the DC-DC battery 220 discharges at the third voltage value and the DC-DC battery reaches a third preset condition, the DC-DC conversion circuit is used to output a fourth voltage value for the DC-DC battery, the fourth voltage value being less than the third voltage value, and the direct-current battery 210 is used to supply power to the load. The third preset condition includes at least one of the following: the depth of discharge of the DC-DC battery reaches a third depth of discharge; the remaining charge of the DC-DC battery 220 reaches a third remaining charge; the discharge duration of the DC-DC battery reaches a third preset duration; the third depth of discharge is greater than the second depth of discharge; and the third remaining charge is less than the second remaining charge.

[0111] In this embodiment, reference continues to be made to... Figure 4 If the third voltage value is 46.1V, as the direct-current battery 210 discharges, the DC voltage output by the direct-current battery 210 gradually decreases. When the DC voltage output by the direct-current battery 210 reaches the third voltage value of 46.1V, the DC-DC battery 220 begins to supply power to the load at the third voltage value. When the DC-DC battery 220 discharges at the third voltage value and reaches the third preset condition, the DC-DC converter circuit controls the DC-DC battery 220 to output a fourth voltage value. Since the fourth voltage value is less than the third voltage value, that is, the DC voltage output by the DC-DC battery is less than the DC voltage output by the direct-current battery 210, the DC voltage output by the direct-current battery 210 is greater than the DC voltage output by the DC-DC battery, thus the direct-current battery 210 begins to supply power to the load. In this way, the purpose of alternating discharge between the direct-current battery and the DC-DC battery can be achieved. Furthermore, when the DC voltage output from the direct-current battery is equal to the third voltage value, the DC-DC battery prioritizes the direct-current battery to power the load, maximizing the discharge of the DC-DC battery and extending its lifespan.

[0112] It should be noted that, in the above Figure 4 In the example where the first voltage value V1 is greater than the initial discharge voltage of the direct-current battery 210, in some examples, the first voltage value V1 is slightly less than the initial discharge voltage of the direct-current battery 210. In this way, when the voltage value of the bus is less than the preset working voltage value, the direct-current battery 210 will discharge for a short period of time, such as a few seconds or tens of milliseconds. When the voltage value of the DC power output by the direct-current battery 210 reaches the first voltage value V1, the DC-DC battery 220 starts to supply power to the load with the first voltage value. When the DC-DC battery reaches the first preset condition, the direct-current battery starts to supply power to the load.

[0113] It should also be noted that the aboveFigure 4 The illustration shows the direct-connect battery 210 and DC-DC battery 220 at full charge when the mains power fails. In some examples, the direct-connect battery 210 or DC-DC battery 220 may not reach full charge when the mains power fails. In this example, when the bus voltage is lower than the preset operating voltage, the DC-DC battery 220 may directly supply power to the load at the second voltage value V2, i.e., the discharge stage T1 shown in the figure. When the DC-DC battery 220 supplies power to the load at the second voltage value t1, the direct-connect battery 210 starts supplying power to the load.

[0114] Based on this, the above describes the specific process of the direct-connect battery 210 and the DC-DC battery alternately supplying power to the load when the bus voltage is less than the preset operating voltage. The following will explain the relationship between the voltage values ​​mentioned above and the relevant parameters set in the power supply system.

[0115] In one embodiment, the first voltage value is greater than a preset alarm voltage value, which is used to instruct the power supply system to generate a command to indicate a low voltage alarm for either the direct-connect battery 210 or the DC-DC battery 220.

[0116] In the embodiments of this application, the above-mentioned Figure 3 For example, assuming the preset low-voltage alarm voltage value is 48.5V, the first voltage value V1 can be set to a value greater than 48.5V, such as 49.7V. When the bus voltage is less than the preset operating voltage, the direct-connect battery 210 prioritizes supplying power to the load. As the direct-connect battery 210 continues to supply power to the load, its output voltage continuously decreases. When the output voltage of the direct-connect battery 210 reaches 49.7V, the DC-DC battery 220 begins to supply power to the load at the first voltage value of 49.7V. Since the DC voltage output by the direct-connect battery 210 and the DC-DC battery 220 is always greater than the preset low-voltage alarm voltage value during this discharge process, the power supply system will not generate an alarm command. This prevents situations where the power grid experiences a short-term power outage but the power supply system has already generated an alarm command, thus avoiding waste of maintenance resources.

[0117] It should be understood that in some possible implementations, the first voltage value may also be equal to the preset low voltage alarm voltage value, or the first voltage value may be less than the preset low voltage alarm voltage value.

[0118] Taking a first voltage value equal to a preset low-voltage alarm voltage value as an example, assuming the preset low-voltage alarm voltage value is 48.5V, the first voltage value V1 can be set to 48.5V. When the bus voltage value is less than the preset operating voltage value, the direct-current battery 210 prioritizes supplying power to the load. As the direct-current battery 210 continues to supply power to the load, the output voltage value of the direct-current battery 210 continuously decreases. When the output voltage value of the direct-current battery 210 reaches 48.5V, the DC-DC battery 220 begins to supply power to the load at the first voltage value of 48.5V. Since the DC voltage values ​​output by the direct-current battery 210 and the DC-DC battery 220 reach the preset low-voltage alarm voltage value during this discharge process, the power supply system generates an alarm command to notify maintenance personnel to perform grid maintenance as soon as possible.

[0119] In one embodiment, the second voltage value is less than a preset alarm voltage value, which is used to instruct the power supply system to generate a command to indicate a low voltage alarm for either the direct-connect battery 210 or the DC-DC battery 220.

[0120] The power supply system is used to generate a command to indicate a low-voltage alarm for the direct-connect battery 210 or the DC-DC battery 220 when the load is powered by the direct-connect battery 210 or the DC-DC battery 220 at a second voltage value.

[0121] This application embodiment is designed so that the second voltage value is less than a preset low-voltage alarm voltage value, in order to notify maintenance personnel to perform grid maintenance as soon as possible. Continuing with the above... Figure 3 For example, assuming the preset low-voltage alarm voltage value is 48.5V, the second voltage value can be set to less than 48.5V, for example, the second voltage value can be set to 47.1V. In this way, when the voltage output of the direct-acting battery 210 reaches the second voltage value of 47.1V, and the DC-DC battery 220 starts to supply power to the load at the second voltage value of 47.1V, the voltage values ​​of the DC power output by the direct-acting battery 210 and the DC-DC battery 220 will reach the preset alarm voltage value. The power supply system will then generate a command to indicate a low-voltage alarm for the direct-acting battery 210 or the DC-DC battery 220, so as to notify maintenance personnel to perform maintenance on the power grid as soon as possible. This can prevent the power supply system from failing to generate an alarm command in time when the direct-acting battery 210 and the DC-DC battery 220 are alternately supplying power to the load, thereby improving the performance and lifespan of the direct-acting battery and the DC-DC battery.

[0122] Furthermore, in one example, this application can also design the second voltage value to be greater than the preset LLVD voltage value. In this way, when the voltage value output by the direct-acting battery 210 reaches the second voltage value of 47.1V and the DC-DC battery 220 starts to supply power to the load at the second voltage value of 47.1V, since the voltage values ​​of the DC power output by the direct-acting battery 210 and the DC-DC battery 220 are always greater than the preset LLVD voltage value, the power supply system will not disconnect the connection between part of the load and the bus. This can prevent the power supply system from prematurely disconnecting the connection between part of the load and the bus and affecting the power supply to part of the load, thereby ensuring the reliability of the power supply system for all loads connected to the bus before the power grid is cut off.

[0123] In one embodiment, the third voltage value is less than a preset LLVD voltage value, which is used to instruct the power supply system to disconnect part of the load from the bus.

[0124] The power supply system is used to disconnect a portion of the load from the bus when the direct-connect battery 210 or DC-DC battery 220 supplies power to the load at a third voltage value.

[0125] In this embodiment, the third voltage value is designed to be less than the preset LLVD voltage value. This is to disconnect part of the load from the bus to extend the power supply time to the remaining load. Continuing to refer to the above... Figure 3 Assuming the preset LLVD voltage value is 47V, the third voltage value can be designed to be 44V. In this way, when the voltage output of the direct-acting battery 210 reaches the third voltage value of 44V and the DC-DC battery 220 starts to supply power to the load at the third voltage value of 44V, when the DC voltage output of the direct-acting battery 210 reaches the preset LLVD voltage value of 47V, the power supply system can disconnect part of the load from the bus, so that the direct-acting battery 210 supplies power to the remaining load. When the DC voltage output of the direct-acting battery 210 reaches the third voltage value of 44V, the DC-DC battery supplies power to the remaining load at the third voltage value of 44V. In this way, the duration of the power supply system supplying power to the remaining load can be extended.

[0126] For example, assuming that the loads in the above embodiment include load 1, load 2, and load 3, and the power of these three loads are 100kW, 10kW, and 1kW respectively, and the power supply of load 2 and load 3 takes priority over the power supply of load 1, when the direct-connect battery 210 or DC-DC battery outputs DC power at the third voltage value, if the third voltage value is greater than the preset LLVD voltage value, the power supply system will not disconnect some loads from the bus. In this way, the power supply system needs to supply power to load 1, load 2, and load 3. However, the remaining discharge capacity of the direct-connect battery 210 or DC-DC battery 220 is limited, resulting in a reduction in the power supply time of load 2 and load 3. Therefore, this application designs the third voltage value to be less than the preset LLVD voltage value. When the voltage output by the direct-connect battery 210 or the DC-DC battery 220 reaches the third voltage value of 44V, since the third voltage value is less than the preset LLVD voltage value, the power supply system disconnects part of the load from the bus. For example, the power supply system can first disconnect the load 1 from the bus. In this way, the power supply system only supplies power to load 2 and load 3, and the discharge power of the direct-connect battery 210 or the DC-DC battery 220 is reduced, thereby extending the time for the power supply system to supply power to load 2 and load 3.

[0127] Furthermore, in one example, this application can also design a third voltage value greater than a preset BLVD voltage value. In this way, when the voltage output of the direct-acting battery 210 reaches the third voltage value of 47.1V and the DC-DC battery 220 starts to supply power to the load at the third voltage value of 47.1V, since the voltage values ​​of the DC power output by the direct-acting battery 210 and the DC-DC battery 220 are always greater than the preset BLVD voltage value, the power supply system will not disconnect all loads from the bus. This can prevent the power supply system from prematurely disconnecting all loads from the bus and affecting the power supply to the load, thereby ensuring the reliability of the power supply system in supplying power to the remaining loads.

[0128] In one embodiment, the fourth voltage value is less than a preset BLVD voltage value, which is used to instruct the power supply system to control the direct-current battery 210 or the DC-DC battery 220 to stop outputting DC power.

[0129] The power supply system is used to control the direct-current battery 210 or the DC-DC battery 220 to stop outputting DC power when the voltage value of the DC power output by the direct-current battery 210 or the DC-DC battery 220 reaches the fourth voltage value.

[0130] This application embodiment designs a fourth voltage value that is less than a preset BLVD voltage value, which can extend the lifespan of the direct-current battery 210 or the DC-DC battery 220. Continuing to refer to the above... Figure 3When the DC-DC battery 220 supplies power to the load at the third voltage value for a period of time, the DC-DC converter circuit controls the DC-DC battery to output DC power at the fourth voltage value. Since the fourth voltage value is less than the third voltage value, the direct-drive battery 210 starts to supply power to the load. As the direct-drive battery 210 continues to supply power to the load, the voltage value of the DC power output by the direct-drive battery 210 continues to decrease. When the voltage value of the DC power output by the direct-drive battery 210 reaches the preset BLVD voltage value, the power supply system disconnects the load from the bus, thereby stopping the power supply system from supplying power to the load. This can reduce the depth of discharge of the direct-drive battery 210 or the DC-DC battery 220, thereby extending the life of the direct-drive battery 210 or the DC-DC battery 220.

[0131] In one embodiment, the first voltage value is less than the DC voltage value of the bus when the power grid connected to the bus supplies power to the load.

[0132] In this embodiment, the first voltage value is lower than the DC voltage value of the bus when the power grid supplies power to the load. This helps to distinguish the source voltage value for power supply to the load, thereby facilitating maintenance personnel's accurate judgment of whether the power grid has restored power supply. Specifically, assuming the voltage value of the power grid supplying power to the load is 54V, the first voltage value can be designed to be 51.5V. When the bus voltage value is 51.5V, it indicates that the power grid has not yet restored power supply, and the load is powered by the DC-DC battery; when the bus voltage value is 54V, it indicates that the power grid has restored power supply, and the load is powered by the power grid.

[0133] In one embodiment, the power supply system is configured to: disconnect a portion of the load on the currently connected bus from the bus each time the direct-connect battery 210 replaces the DC-DC battery 220 to power the load, or each time the DC-DC battery 220 replaces the direct-connect battery 210 to power the load.

[0134] refer to Figure 5 The BLVD voltage value shown in the figure is the preset BLVD voltage value, such as the voltage value of 42V in the above embodiment. Assuming the load includes load 1, load 2, load 3, load 4, load 5, and load 6, under normal circumstances, when the power grid supplies power to the load, the DC voltage value of the power grid supplying the load is V0, for example, 54V. When the power grid malfunctions, the direct-connect battery 210 can supply power to these 6 loads. When the direct-connect battery 210 supplies power to the load for a duration t1, the DC-DC battery 220 supplies power to the load at a voltage value V1. Furthermore, when the DC-DC battery 220 replaces the direct-connect battery 210 to supply power to the load, the power supply system disconnects some loads from the bus, such as disconnecting load 1 from the bus. Thus, the DC-DC battery 220 supplies power to the remaining 5 loads at a voltage value V1, that is, the DC-DC battery 220 supplies power to loads 2, 3, 4, 5, and 6 at a voltage value V1.

[0135] While the DC-DC battery 220 supplies power to the five loads for time t1', the direct-drive battery 210 begins supplying power to the loads. Furthermore, when the direct-drive battery 210 replaces the DC-DC battery 220 to supply power to the loads, the power supply system again disconnects some loads from the bus, such as disconnecting load 2 from the bus. Thus, the direct-drive battery supplies power to the remaining four loads for time t2, specifically loads 3, 4, 5, and 6 for time t2.

[0136] Repeat the above process until the direct-acting battery 210 or the DC-DC battery 220 is substantially fully discharged, then disconnect all loads from the bus. This extends the duration for which the direct-acting battery 210 and the DC-DC battery 220 supply power to the remaining loads connected to them.

[0137] In this embodiment of the application, each time the direct-current battery replaces the DC-DC battery to power the load, or each time the DC-DC battery replaces the direct-current battery to power the load, the power supply system can disconnect part of the load currently connected to the bus from the bus. In this way, the power supply system can extend the time for the remaining load to be powered by the remaining load as much as possible, and ensure the reliability of the power supply system to power the remaining load as much as possible.

[0138] In addition, this application also provides a DC-DC battery 220, such as Figure 6 As shown, the DC-DC battery includes a cell pack 221 and a DC-DC conversion circuit 222. The DC-DC conversion circuit 222 is used to convert the voltage output from the cell pack and output the converted voltage to the load through the bus.

[0139] In this embodiment of the application, the battery pack 221 inputs a voltage value to the DC-DC conversion circuit 222. The voltage value input by the battery pack 221 to the DC-DC conversion circuit changes with the capacity of the battery pack 221. The DC-DC conversion circuit 222 can convert the voltage value output by the battery pack 221, so that the DC-DC battery supplies power to the load with the voltage value converted by the DC-DC conversion circuit 222.

[0140] The DC-DC converter circuit 222 is used to: convert the voltage value output by the battery pack into a first voltage value when the voltage value at the output port of the DC-DC battery is less than a preset operating voltage value; and convert the voltage value output by the battery pack 221 into a second voltage value when the DC-DC battery 220 reaches a first preset condition, wherein the second voltage value is less than the first voltage value. The first preset condition includes at least one of the following: the depth of discharge of the DC-DC battery 220 reaches a first depth of discharge; the remaining charge of the DC-DC battery 220 reaches a first remaining charge; and the discharge duration of the DC-DC battery 220 is a first preset duration.

[0141] In this embodiment, during normal power supply to the load from the mains grid, since the DC-DC battery 220 is connected to the bus, the voltage at the output port of the DC-DC battery 220 is the voltage of the bus, i.e., the preset operating voltage value mentioned above. Assuming the preset operating voltage value is 51.5V, when the voltage at the output port of the DC-DC battery 220 decreases, i.e., the voltage of the bus decreases, it indicates a power outage in the mains, meaning the mains grid cannot supply power to the load. Therefore, when the voltage at the output port of the DC-DC battery is lower than the preset operating voltage value, the DC-DC battery 220 supplies power to the load, ensuring continuous power supply. The DC-DC converter circuit 222 can convert the voltage output from the battery pack 221 into a first voltage value, so that the DC-DC battery 220 supplies power to the load at the first voltage value. When the DC-DC battery 220 discharges at a first voltage value and the DC-DC battery 220 reaches a first preset condition, the DC-DC conversion circuit 222 converts the voltage value output by the cell pack 221 into a second voltage value. Since the second voltage value is less than the first voltage value, the DC-DC battery 220 can be prevented from being over-discharged, thereby improving the performance and service life of the DC-DC battery 220.

[0142] In some examples, a first voltage value can be set to be greater than a preset low-voltage alarm voltage value, thereby preventing situations where the power grid experiences a short-term power outage but the power supply system generates an alarm command. Specifically, the first voltage value is greater than the preset alarm voltage value. Taking a preset alarm voltage value of 48.5V as an example, the first voltage value can be set to a value greater than 48.5V. Assuming the first voltage value is set to 51V, when the DC-DC battery 220 supplies power to the load at the first voltage value, since the corresponding first voltage value of the DC power output by the DC-DC battery 220 is always greater than the preset alarm voltage value, the power supply system will not generate an alarm command when the DC-DC battery 220 supplies power to the load at the first voltage value. This prevents situations where the power grid experiences a short-term power outage but the power supply system has already generated an alarm command, thereby avoiding the waste of maintenance resources.

[0143] In other examples, a second voltage value can be set to be lower than a preset low-voltage alarm voltage value, thereby notifying maintenance personnel to perform grid maintenance as soon as possible. Specifically, still assuming the preset low-voltage alarm voltage value is 48.5V, the second voltage value can be designed to be 48V. When the DC-DC converter circuit 222 converts the voltage value output from the battery pack 221 to the second voltage value of 48V, it indicates that the remaining discharge capacity of the DC-DC battery 220 is low. If the power supply system does not generate an alarm command, it will affect the normal subsequent discharge of the DC-DC battery 220, and in severe cases, may reduce the performance and lifespan of the DC-DC battery. Therefore, when the DC-DC converter circuit converts the voltage value output from the battery pack to the second voltage value, since the second voltage value is lower than the preset low-voltage alarm voltage value, the power supply system can generate an alarm command to notify maintenance personnel to perform grid maintenance as soon as possible.

[0144] The first preset condition may include at least one of the above-mentioned conditions. Taking the discharge depth of the DC-DC battery 220 reaching a first discharge depth as an example, assuming the first discharge depth is 50%, when the DC-DC battery discharges at a first voltage value and the discharge depth of the DC-DC battery 220 is 50%, the DC-DC conversion circuit controls the DC-DC battery 220 to output a second voltage value, thereby the DC-DC battery 220 outputs a second voltage value to the load.

[0145] In one embodiment, the DC-DC converter circuit 222 can convert the voltage value output by the battery pack 221 into different voltage values, for example, referring to... Figure 7 The DC-DC converter circuit 222 is used to: convert the voltage value output by the battery pack into a first voltage value V1 when the voltage value at the output port of the DC-DC battery is less than a preset operating voltage value; and convert the voltage value output by the battery pack 221 into a second voltage value V2 when the DC-DC battery 220 reaches a first preset condition, wherein the second voltage value is less than the first voltage value. When the DC-DC battery 220 reaches a second preset condition, convert the voltage value output by the battery pack 221 into a third voltage value V3, wherein the third voltage value is less than the second voltage value. The second preset condition includes at least one of the following: the depth of discharge of the DC-DC battery 220 reaches a second depth of discharge; the remaining charge of the DC-DC battery 220 reaches a second remaining charge; and the discharge duration of the DC-DC battery 220 reaches a second preset duration.

[0146] Among them, the first voltage value V1 is greater than the preset low voltage alarm voltage value, the second voltage value is less than the preset alarm voltage value and greater than the preset LLVD voltage value, and the third voltage value is less than the preset LLVD voltage value and greater than the preset BLVD voltage value.

[0147] refer to Figure 7The low voltage alarm voltage value shown in the figure is the preset low voltage alarm voltage value, such as the voltage value of 48.5V in the above embodiment. The LLVD voltage value is the preset LLVD voltage value, such as the voltage value of 47V in the above embodiment. The BLVD voltage value is the preset BLVD voltage value, such as the voltage value of 42V in the above embodiment.

[0148] In this embodiment, under normal circumstances, when the power grid supplies power to the load, the DC voltage value of the power supply is V0, for example, 54V. When the power grid malfunctions, the DC-DC battery 220 supplies power to the load at voltage V1. After the DC-DC battery 220 supplies power at voltage V1 for a duration t0, it supplies power to the load at voltage V2. Since V1 is greater than the preset low-voltage alarm voltage value, the power supply system will not generate an alarm command within the duration t0. This prevents the situation where the power grid is restored after a power outage but the power supply system has already generated an alarm command, avoiding waste of maintenance resources. Furthermore, since V2 is less than the preset low-voltage alarm voltage value, when the DC-DC battery 220 supplies power to the load at V2, the power supply system generates an alarm command to notify maintenance personnel to repair the power grid as soon as possible. This prevents the DC-DC battery 220 from triggering an alarm only after it has been almost completely discharged, thus achieving the expected alarm effect and improving the performance and lifespan of the DC-DC battery.

[0149] After the DC-DC battery 220 supplies power to the load at voltage V2 for a duration t1, it then supplies power to the load at voltage V3. Since V2 is greater than the preset LLVD voltage value, the power supply system will not disconnect some loads from the bus during the duration t1. This allows the DC-DC battery 220 to supply power to all loads that were powered before the power grid failure, ensuring reliable power supply to all loads. Conversely, since V3 is less than the preset LLVD voltage value, when the DC-DC battery supplies power to the load at V3, the power supply system disconnects some loads from the bus, allowing the DC-DC battery 220 to supply power to the remaining loads. This extends the duration for which the DC-DC battery 220 supplies power to the remaining loads.

[0150] After the DC-DC battery 220 supplies power to the load at voltage V3 for a duration t2, the DC-DC battery 220 reduces the voltage supplied to the load. Since V3 is greater than the preset BLVD voltage, the power supply system will not disconnect the remaining load from the bus during the duration t2. This prevents the DC-DC battery 220 from being unable to supply power to the remaining load due to the power supply system disconnecting the remaining load from the bus, thus improving the reliability of the DC-DC battery 220 supplying power to the remaining load. After the DC-DC battery 220 supplies power to the load at voltage V3 for a duration t2, the DC-DC battery 220 reduces the voltage supplied to the load. When the voltage output by the DC-DC battery 220 is less than the preset BLVD voltage, the power supply system disconnects all remaining loads from the bus, thereby stopping the DC-DC battery 220 from supplying power to all remaining loads. This reduces the depth of discharge of the DC-DC battery, thereby extending the life of the DC-DC battery.

[0151] In this embodiment, a first preset duration for the DC-DC battery 220 to supply power to the load at a first voltage value is set. Specifically, when a power outage causes the grid to be unable to supply power to the load, the DC-DC battery 220 begins to supply power to the load. Since there may still be residual voltage to supply power to the load after a power outage, the DC-DC battery 220 supplies power to the load in a slow voltage ramp-up process. When the discharge voltage of the DC-DC battery 220 reaches a relatively stable value, the discharge power of the DC-DC battery also becomes relatively stable. Therefore, the DC-DC battery 220 can obtain the remaining discharge duration of the cell pack 221 based on the quotient of the remaining discharge capacity of the cell pack 221 and the discharge power of the DC-DC battery.

[0152] For example, if the remaining discharge capacity of the battery pack 221 is 8kWh and the discharge power of the DC-DC battery is 2kW, then the remaining discharge time of the battery pack 221 is 4.0h. If the maintenance personnel spend 0.5h maintaining the power grid, then the time required for the bus voltage to reach the preset operating voltage is 0.5h, i.e., the time t1 in the above embodiment is 0.5h. If the time required for the important load to be powered is 2.5h, i.e., the time t2 in the above embodiment is 2.5h, then the time for the DC-DC converter circuit 222 to power the load at the first voltage value is 4.0-0.5-2.5=1.0h. In other words, during the process of the DC-DC battery supplying power to the load, priority is given to ensuring the duration for which the DC-DC battery supplies power to the load at the second and third voltage values. This corresponds to the time for maintenance personnel to repair the power grid and the time for the DC-DC battery to supply power to the remaining critical loads. This maximizes the chances of the power grid restoring power, improving the success rate of power grid supply to the load, and maximizes the supply of power from the DC-DC battery to critical loads, improving the reliability of the DC-DC battery supplying power to the remaining critical loads. Moreover, during the first hour that the DC-DC battery 220 starts supplying power to the load, the DC-DC battery 220 will not generate any instructions to indicate a low-voltage alarm. During this hour, there is always power output to the load, and the load is always in operation. However, since the power supply system does not generate any instructions to indicate a low-voltage alarm, maintenance personnel will not need to repair the power grid, thus avoiding a waste of maintenance resources.

[0153] In one embodiment, the DC-DC converter circuit 222 is further configured to: convert the voltage value output by the battery pack 221 into different voltage values ​​at regular intervals, wherein the voltage value after conversion by the DC-DC converter circuit is less than the voltage value before conversion by the DC-DC converter circuit, and the voltage value output by the DC-DC converter circuit remains constant within each interval.

[0154] In this embodiment of the application, when the power grid fails and cannot supply power to the load, the DC-DC battery 220 starts to supply power to the load. During the process of supplying power to the load, the DC-DC conversion circuit 222 can convert the voltage value output by the battery pack 221 into different voltage values ​​at regular intervals. Each time, the voltage value after conversion by the DC-DC conversion circuit is less than the voltage value before conversion. In this way, the voltage value of the DC power output by the DC-DC battery 220 to the load gradually decreases, thereby extending the duration of the DC-DC battery 220 supplying power to the load.

[0155] Specifically, refer to Figure 8Under normal circumstances, when the power grid supplies power to the load, the DC voltage value of the power supplied by the power grid to the load is V0. When the power grid malfunctions, the DC-DC converter circuit 222 converts the DC power output from the battery pack into a voltage value V1, so that the DC-DC battery 220 supplies power to the load with voltage value V1. After the DC-DC battery 220 supplies power with voltage value V1 for a duration of t1', the DC-DC converter circuit 222 converts the DC power output from the battery pack into a voltage value V2, so that the DC-DC battery 220 supplies power to the load with voltage value V2. After the DC-DC battery 220 supplies power with voltage value V2 for a duration of t2', the DC-DC converter circuit 222 converts the DC power output from the battery pack into a voltage value V3, so that the DC-DC battery 220 supplies power to the load with voltage value V3, and so on. When the DC-DC converter circuit converts the DC power output from the battery pack into a voltage value Vn, since the voltage value Vn is less than the preset BLVD voltage value, the DC-DC battery 220 stops supplying power to the load.

[0156] In practical scenarios, each time the DC-DC converter circuit 222 converts the voltage value output by the battery pack 221 to a different voltage value, the power supply system can disconnect part of the load from the bus, allowing the DC-DC battery 220 to supply power to the remaining load. Furthermore, each time the output voltage value of the DC-DC battery 220 changes, the DC-DC battery 220 can determine the remaining discharge time of the battery pack 221 based on the quotient of the remaining discharge capacity of the battery pack 221 and the discharge power of the DC-DC battery. After the DC-DC battery 220 has been supplying power to the load for a certain period, the power supply system can disconnect part of the load from the bus, allowing the DC-DC battery 220 to supply power only to the remaining load connected to the bus. Since the load currently connected to the DC-DC battery 220 is reduced at this time, the current discharge power of the DC-DC battery is also reduced. The DC-DC battery 220 can calculate the current remaining discharge time of the DC-DC battery based on the current remaining discharge capacity of the cell pack 221 and the current discharge load power of the DC-DC battery. Based on the current remaining discharge time of the DC-DC battery, it supplies power to a portion of the load for a period of time, and this period of time is less than the current remaining discharge time. The above operation is repeated until the DC-DC battery 220 is basically completely discharged.

[0157] For example, suppose the load includes load 1, load 2, load 3, and load 4, with power ratings of 1kW, 0.5kW, 0.2kW, and 0.3kW respectively. When the grid loses power, the remaining discharge capacity of battery pack 221 is 8kWh, and the discharge power of the DC-DC battery is 2kW. Therefore, the remaining discharge time of battery pack 221 is 4.0h. If the DC-DC battery supplies power to the loads for a duration t1', where t1' can be, for example, 1h, then the remaining discharge capacity of battery pack 221 is 6kWh. At this time, the power supply system can disconnect some loads from the bus, such as disconnecting from load 1. Thus, the DC-DC battery only supplies power to loads 2, 3, and 4, thereby reducing the power supplied by the DC-DC battery 220 to the remaining loads. Since the DC-DC battery is currently connected to only loads 2, 3, and 4, the power supplied by the DC-DC battery to the load is reduced to 1kW. That is, the current discharge load power of DC-DC battery 220 is 1kW. Therefore, the current remaining discharge time of cell pack 221 is 6 / 1 = 6.0h. This means that DC-DC battery 220 can supply power to the currently connected load for 6 hours. In actual scenarios, in order to extend the power consumption of important loads as much as possible, the time for DC-DC battery 220 to supply power to the currently connected load is less than 6 hours. For example, t2' can be 2 hours. Then the remaining discharge capacity of cell pack 221 is 6 - 1 * 2 = 4kWh. At this point, the power supply system can continue to disconnect the DC-DC battery 220 from some loads, such as disconnecting load 2. As a result, the DC-DC battery only supplies power to loads 3 and 4, and the power supplied by the DC-DC battery 220 to the loads is further reduced. Since the loads currently connected to the DC-DC battery only include loads 3 and 4, the power supplied by the DC-DC battery to the loads is reduced to 0.5kW. That is, the current discharge power of the DC-DC battery 220 is 0.5kW. The current remaining discharge time of the battery pack 221 is 4 / 0.5 = 8.0h, which means that the DC-DC battery 220 can supply power to the currently connected loads for 8 hours. In actual scenarios, the time for the DC-DC battery 220 to supply power to the currently connected loads is less than 8 hours. Repeat the above operation until the DC-DC battery 220 is basically completely discharged, and the power supply system disconnects all loads from the bus.

[0158] In this embodiment of the application, during the discharge process of the DC-DC battery, the DC-DC battery 220 supplies power to the load at different voltage values. Each time the DC-DC conversion circuit converts the voltage value output by the cell pack 221 to a different voltage value, the power of the DC-DC battery 220 to supply power to the load is reduced, that is, the discharge power of the DC-DC battery 220 is reduced. This can extend the duration of the DC-DC battery supplying power to part of the load as much as possible. Specifically, after the DC-DC battery has discharged for a certain period of time, the power supply system can disconnect some loads from the bus, thereby reducing the load currently connected to the DC-DC battery. Correspondingly, the power supplied by the DC-DC battery 220 to the load also decreases. The DC-DC battery recalculates its current remaining discharge time. After the DC-DC battery has discharged for another period of time, the power supply system can again disconnect some loads from the bus, thereby further reducing the load currently connected to the DC-DC battery. The power supplied by the DC-DC battery 220 to the load continues to decrease, and the DC-DC battery recalculates its current remaining discharge time again. This cycle repeats multiple times until the DC-DC battery is basically fully discharged, for example, when the DC voltage output by the DC-DC battery is less than the preset BLVD voltage value. In this way, the purpose of precise power supply based on load grading can be achieved, and the duration of power supply from the DC-DC battery to important loads can be extended as much as possible, ensuring reliable power supply to important loads.

[0159] In one embodiment, the first voltage value is less than the DC voltage value of the bus when the power grid connected to the bus supplies power to the load.

[0160] Regarding the DC voltage value of the bus when the first voltage value is less than the DC voltage value of the grid connected to the bus to supply power to the load, please refer to the above-mentioned content, which will not be repeated here.

[0161] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply system, characterized in that, The power supply system includes a direct-flow battery and a DC-DC converter battery. The DC-DC converter battery includes a cell pack and a DC-DC converter circuit. Both the direct-flow battery and the DC-DC converter battery are used to supply power to the load through the bus. Under the condition that the voltage value of the bus is less than the preset operating voltage value: When the voltage of the DC power output from the direct-current battery is greater than the voltage of the DC power output from the DC-DC battery, the direct-current battery is used to supply power to the load. When the voltage of the DC power output from the direct-current battery is less than the voltage of the DC power output from the DC-DC battery, the DC-DC battery is used to supply power to the load. The DC-DC converter circuit is used to convert the voltage output by the battery pack so that the direct-current battery and the DC-DC battery alternately supply power to the load multiple times.

2. The power supply system according to claim 1, characterized in that, The initial voltage value of the DC power output by the direct-current battery is greater than the first voltage value corresponding to the DC power output by the DC-DC battery, and the direct-current battery is used to supply power to the load; When the voltage value of the DC power output by the direct-current battery is equal to the first voltage value, the DC-DC battery outputs the DC power of the first voltage value to supply power to the load.

3. The power supply system according to claim 2, characterized in that, When the DC-DC battery discharges at the first voltage value and the DC-DC battery reaches the first preset condition, the DC-DC conversion circuit controls the DC-DC battery to output a second voltage value, the second voltage value being less than the first voltage value. The direct-connect battery is used to supply power to the load. The first preset condition includes at least one of the following: the depth of discharge of the DC-DC battery reaches the first depth of discharge, the remaining charge of the DC-DC battery reaches the first remaining charge, and the DC-DC battery discharges at the first voltage value for a first preset duration. When the voltage value of the DC power output by the direct-current battery is equal to the second voltage value, the DC-DC battery is used to output the DC power of the second voltage value to supply power to the load.

4. The power supply system according to claim 3, characterized in that, When the DC-DC battery discharges at the second voltage value and the DC-DC battery reaches the second preset condition, the DC-DC conversion circuit controls the DC-DC battery to output a third voltage value, the third voltage value being less than the second voltage value. The direct-connect battery is used to supply power to the load. The second preset condition includes at least one of the following: the depth of discharge of the DC-DC battery reaches the second depth of discharge; the remaining charge of the DC-DC battery reaches the second remaining charge; the DC-DC battery discharges at the second voltage value for a second preset duration; the second depth of discharge is greater than the first depth of discharge; and the second remaining charge is less than the first remaining charge. When the voltage value of the DC power output by the direct-current battery is equal to the third voltage value, the DC-DC battery is used to output the DC power of the third voltage value to supply power to the load.

5. The power supply system according to claim 4, characterized in that, When the DC-DC battery discharges at the third voltage value and the DC-DC battery reaches the third preset condition, the DC-DC conversion circuit controls the DC-DC battery to output a fourth voltage value, the fourth voltage value being less than the third voltage value. The direct-connect battery is used to supply power to the load. The third preset condition includes at least one of the following: the depth of discharge of the DC-DC battery reaches the third depth of discharge; the remaining charge of the DC-DC battery reaches the third remaining charge; the DC-DC battery discharges at the third voltage value for the third preset duration; the third depth of discharge is greater than the second depth of discharge; and the third remaining charge is less than the second remaining charge. When the voltage value of the DC power output by the direct-current battery is equal to the fourth voltage value, the DC-DC battery is used to output the DC power of the fourth voltage value to supply power to the load.

6. The power supply system according to claim 1, characterized in that, The first voltage value corresponding to the DC power output by the DC-DC battery is greater than the initial voltage value of the DC power output by the direct-current battery, and the DC-DC battery is used to output the DC power of the first voltage value to supply power to the load; When the DC-DC battery discharges at the first voltage value and the DC-DC battery reaches the first preset condition, the DC-DC conversion circuit is used to control the DC-DC battery to output a second voltage value, the second voltage value being less than the initial voltage value of the direct-connect battery, and the direct-connect battery being used to supply power to the load; The first preset condition includes at least one of the following: The DC-DC battery reaches a first depth of discharge, the remaining charge of the DC-DC battery reaches a first remaining charge, and the DC-DC battery discharges at the first voltage value for a first preset time.

7. The power supply system according to claim 6, characterized in that, When the voltage value of the DC power output by the direct-current battery is equal to the second voltage value, the DC-DC battery is used to output the DC power of the second voltage value to supply power to the load; When the DC-DC battery discharges at the second voltage value and the DC-DC battery reaches the second preset condition, the DC-DC conversion circuit is used to control the DC-DC battery to output a third voltage value, the third voltage value being less than the second voltage value, and the direct-connect battery is used to supply power to the load; The second preset condition includes at least one of the following: The DC-DC battery reaches a second discharge depth, the remaining charge of the DC-DC battery reaches a second remaining charge, the DC-DC battery discharges at the second voltage value for a second preset duration, the second discharge depth is greater than the first discharge depth, and the second remaining charge is less than the first remaining charge.

8. The power supply system according to claim 7, characterized in that, When the voltage value of the DC power output by the direct-current battery is equal to the third voltage value, the DC-DC battery is used to output the DC power of the third voltage value to supply power to the load; When the DC-DC battery discharges at the third voltage value and the DC-DC battery reaches the third preset condition, the DC-DC conversion circuit is used to control the DC-DC battery to output a fourth voltage value, the fourth voltage value being less than the third voltage value, and the direct-connect battery is used to supply power to the load. The third preset condition includes at least one of the following: The DC-DC battery reaches a third discharge depth, the remaining charge of the DC-DC battery reaches a third remaining charge, the DC-DC battery discharges at the third voltage value for a third preset duration, the third discharge depth is greater than the second discharge depth, and the third remaining charge is less than the second remaining charge.

9. The power supply system according to any one of claims 2 to 8, characterized in that, The first voltage value is greater than a preset alarm voltage value, which is used to instruct the power supply system to generate a command to indicate a low voltage alarm for the direct-acting battery or the DC-DC battery.

10. The power supply system according to any one of claims 3 to 8, characterized in that, The second voltage value is less than a preset alarm voltage value, which is used to instruct the power supply system to generate a command to indicate a low voltage alarm for the direct-acting battery or the DC-DC battery; The power supply system is used for: When the direct-acting battery or the DC-DC battery supplies power to the load at the second voltage value, a command is generated to indicate a low-voltage alarm for the direct-acting battery or the DC-DC battery.

11. The power supply system according to any one of claims 4 to 5 or 7 to 8, characterized in that, The third voltage value is less than the preset LLVD voltage value, which is used to instruct the power supply system to disconnect part of the load from the bus. The power supply system is used for: When the direct-flow battery or the DC-DC battery supplies power to the load at a third voltage value, disconnect a portion of the load from the bus.

12. The power supply system according to claim 5 or 8, characterized in that, The fourth voltage value is less than the preset BLVD voltage value, and the preset BLVD voltage value is used to instruct the power supply system to control the direct-flow battery or the DC-DC battery to stop outputting DC power. The power supply system is used for: When the voltage value of the DC power output by the direct-current battery or the DC-DC battery reaches the fourth voltage value, the direct-current battery or the DC-DC battery is controlled to stop outputting DC power.

13. The power supply system according to any one of claims 1 to 12, characterized in that, The power supply system is used for: Each time the direct-drive battery replaces the DC-DC battery to power the load, or each time the DC-DC battery replaces the direct-drive battery to power the load, the connection between a portion of the load currently connected to the bus and the bus is disconnected.

14. A DC-DC-DC battery, characterized in that, The DC-DC battery includes a cell pack and a DC-DC conversion circuit. The DC-DC conversion circuit is used to convert the voltage output by the cell pack and output the converted voltage to the load through the bus. The DC-DC converter circuit is used to: convert the voltage value output by the battery pack into a first voltage value when the voltage value at the output port of the DC-DC battery is less than a preset operating voltage value, and convert the voltage value output by the battery pack into a second voltage value when the DC-DC battery reaches a first preset condition, wherein the second voltage value is less than the first voltage value; The first preset condition includes at least one of the following: The DC-DC battery reaches a first depth of discharge, the DC-DC battery has a first remaining charge, and the DC-DC battery has a first preset discharge duration.

15. The DC-DC battery according to claim 14, characterized in that, The DC-DC converter circuit is also used for: At regular intervals, the voltage value output by the battery pack is converted into a different voltage value, and the voltage value after conversion by the DC-DC converter is less than the voltage value before conversion by the DC-DC converter each time, and the voltage value output by the DC-DC converter remains constant within each interval.

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