CN-122026557-A - Power supply system
Abstract
The application provides a power supply system which comprises an alternating current-direct current (AC) -DC power supply module, a lead-acid battery and a direct current-Direct Current (DC) -DC lithium battery, wherein the input end of the AC-DC power supply module is used for being connected with an external power supply, the output end of the AC-DC power supply module is connected with the lead-acid battery and the DC-DC lithium battery, the output end of the AC-DC power supply module, the lead-acid battery and the DC-DC lithium battery are all used for being connected with a load through a direct current bus, and the DC-DC lithium battery is also used for being connected with the lead-acid battery through the direct current bus. The DC-DC lithium battery is used for inputting direct current with a first voltage value to the direct current bus when the electric quantity of the lead-acid battery is full electric quantity and inputting direct current with a second voltage value to the direct current bus when the electric quantity of the lead-acid battery is not full electric quantity under the condition that the AC-DC power supply module receives electric energy of an external power supply, and the second voltage value is larger than the first voltage value. The application can improve the performance and service life of the lead-acid battery.
Inventors
- ZHAI XINYUAN
- WU WENXUE
Assignees
- 华为数字能源技术有限公司
Dates
- Publication Date
- 20260512
- Application Date
- 20241106
Claims (9)
- 1. A power supply system is characterized by comprising an alternating current-direct current (AC-DC) power supply module, a lead-acid battery and a direct current-direct current (DC-DC) DC-DC lithium battery, wherein the input end of the AC-DC power supply module is used for being connected with an external power supply, the output end of the AC-DC power supply module is connected with the lead-acid battery and the DC-DC lithium battery, the output end of the AC-DC power supply module, the lead-acid battery and the DC-DC lithium battery are all used for being connected with a load through a direct current bus, the DC-DC lithium battery is also used for being connected with the lead-acid battery through the direct current bus, The DC-DC lithium battery is used for receiving the electric energy of the external power supply by the AC-DC power supply module: When the electric quantity of the lead-acid battery is full, inputting direct current with a first voltage value to the direct current bus; And when the electric quantity of the lead-acid battery is not full, inputting direct current with a second voltage value to the direct current bus, wherein the second voltage value is larger than the first voltage value.
- 2. The power supply system of claim 1, wherein the DC-DC lithium battery is configured to: When the electric quantity of the lead-acid battery is full, and the AC-DC power supply module meets a preset condition, supplying power to the load by the first voltage value; When the electric quantity of the lead-acid battery is not full, and the AC-DC power supply module meets the preset condition, supplying power to the load by the second voltage value; Wherein the preset conditions include at least one of: The power of direct current output by the AC-DC power supply module to the direct current bus is smaller than the required power of the load, and the frequency of alternating current input by the AC-DC power supply module is smaller than the preset working frequency.
- 3. The power supply system of claim 2, wherein the DC-DC lithium battery is configured to: When the electric quantity of the lead-acid battery is full, and the AC-DC power supply module meets the preset condition, and the commercial power price is the peak power price, the load is powered by the first voltage value; And when the electric quantity of the lead-acid battery is not full, and the AC-DC power supply module meets the preset condition, and the commercial power price is the peak power price, the load is powered by the second voltage value.
- 4. A power supply system according to claim 2 or 3, wherein the preset condition includes that the power of the direct current output by the AC-DC power supply module is smaller than the required power of the load; in the case that the rated discharge power of the DC-DC lithium battery is greater than the supplemental power and less than the sum of the supplemental power and the power of the rated charge power of the lead-acid battery, the discharge power of the DC-DC lithium battery is equal to the rated discharge power of the DC-DC lithium battery; In the case that the rated discharge power of the DC-DC lithium battery is greater than the supplemental power and greater than the sum of the supplemental power and the power of the rated charge power of the lead-acid battery, the discharge power of the DC-DC lithium battery is equal to the sum of the supplemental power and the power of the rated charge power of the lead-acid battery; The supplementary power is the difference value between the required power of the load and the power of the direct current output by the AC-DC power supply module.
- 5. The power system of claim 1, wherein the DC-DC lithium battery is further configured to: And stopping outputting the direct current of the second voltage value when the DC-DC lithium battery outputs the second voltage value for a preset period of time.
- 6. The power supply system according to any one of claims 2 to 4, wherein the DC-DC lithium battery is further configured to: And stopping outputting the direct current of the second voltage value when the DC-DC lithium battery outputs the second voltage value for a preset period of time.
- 7. The power system of claim 6, wherein the DC-DC lithium battery is further configured to: and outputting the direct current of the first voltage value when the AC-DC power supply module meets the preset condition after stopping outputting the direct current of the second voltage value.
- 8. The power system of claim 7, wherein the DC-DC lithium battery is configured to: And after stopping outputting the direct current of the second voltage value, outputting the direct current of the first voltage value when the AC-DC power supply module meets the preset condition and the commercial power price is the peak power price.
- 9. The power supply system according to any one of claims 1 to 8, wherein, The DC-DC lithium battery is used for outputting direct current of the first voltage value to the load under the condition that the AC-DC power supply module does not receive the electric energy of the external power supply; The lead-acid battery is used for outputting direct current to the load when the electric quantity of the DC-DC lithium battery is smaller than the preset electric quantity.
Description
Power supply system Technical Field The application relates to the field of charging, in particular to a power supply system. Background The AC-DC (ALTERNATING CURRENT-direct current) power module may convert AC provided by an external power source into DC for transmission to a load, or may convert AC provided by an external power source into DC for charging a lead-acid battery and a direct current-direct current (DC-DC) lithium battery. The DC-DC lithium battery and the lead-acid battery may supply power to the load when the external power source fails. When the external power supply resumes the power supply, the AC-DC power supply module may convert the alternating current supplied by the external power supply into direct current, and transmit the converted direct current to the DC-DC lithium battery and the lead-acid battery. However, when the AC-DC power module charges the two batteries at a lower voltage value, it may result in the lead-acid battery not reaching full charge, which may reduce the performance and service life of the lead-acid battery if the lead-acid battery fails to reach full charge for a long period of time. Disclosure of Invention The application provides a power supply system which can improve the performance of a lead-acid battery and prolong the service life of the lead-acid battery. In a first aspect, the present application provides a power supply system, the power supply system comprising an AC-DC power module, a lead-acid battery and a DC-DC lithium battery, the input of the AC-DC power module being for connection to an external power source, the output of the AC-DC power module being connected to the lead-acid battery and the DC-DC lithium battery, the output of the AC-DC power module, the lead-acid battery and the DC-DC lithium battery being for connection to a load via a DC bus, the DC-DC lithium battery being also for connection to the lead-acid battery via a DC bus. The DC-DC lithium battery is used for inputting direct current of a first voltage value to the direct current bus when the electric quantity of the lead-acid battery is full electric quantity and inputting direct current of a second voltage value to the direct current bus when the electric quantity of the lead-acid battery is not full electric quantity under the condition that the AC-DC power supply module receives electric energy of an external power supply, and the second voltage value is larger than the first voltage value. In the embodiment of the application, under the condition that the AC-DC power supply module receives the electric energy of an external power supply, when the electric quantity of the lead-acid battery is full, the DC-DC lithium battery can input direct current with a first voltage value to the direct current bus, and when the electric quantity of the lead-acid battery is not full, the DC-DC lithium battery can input direct current with a second voltage value to the direct current bus, and the direct current with the second voltage value can be used for charging the lead-acid battery, so that the charging electric quantity of the lead-acid battery can be improved, the lead-acid battery can reach a full electric quantity state, and therefore, the performance of the lead-acid battery can be improved, and the service life of the lead-acid battery can be prolonged. With reference to the first aspect, in one possible implementation manner, the DC-DC lithium battery is used for supplying power to the load with a first voltage value when the electric quantity of the lead-acid battery is full and the AC-DC power module meets a preset condition, and supplying power to the load with a second voltage value when the electric quantity of the lead-acid battery is not full and the AC-DC power module meets the preset condition. The preset conditions comprise at least one of the following that the power of direct current output by the AC-DC power supply module to the direct current bus is smaller than the required power of a load, and the frequency of alternating current input by the AC-DC power supply module is smaller than the preset working frequency. In the embodiment of the application, when the electric quantity of the lead-acid battery is full, and the AC-DC power supply module meets the preset condition, the DC-DC lithium battery supplies power to the load by a first voltage value, so that the power supply system can meet the preset condition. Specifically, when the electric quantity of the lead-acid battery is full, and the power of direct current output by the AC-DC power supply module to the direct current bus is smaller than the required power of the load, the DC-DC lithium battery supplies power to the load by a first voltage value so as to meet the power requirement of the load as much as possible, and therefore normal operation of the load can be guaranteed. When the electric quantity of the lead-acid battery is full and the frequency of alternating current input by the AC-DC power supply