On-orbit charging and discharging method for reducing memory effect of cadmium-nickel battery pack used in spacecraft

Abstract

The invention provides an in-orbit memory effect reducing charging and discharging method of a Cd / Ni storage battery pack for a spacecraft. The method comprises the following steps that according to the real-time load power consumption of the spacecraft and the characteristics of Cd / Ni storage battery pack, the discharging depth of the storage battery pack is set and the charging control voltage is regulated in three stages; at the first stage, when the real-time power consumption is greater than or equal to 80 percent of the rated power consumption of the spacecraft load, all storage battery packs are controlled to perform grid-connection work; when the discharging depth of the battery pack is 30 to 40 percent of the rated discharging depth, the normal charging control voltage is used; at the second stage, when the real-time power consumption is not higher than 50 percent of the rated power consumption, at least one storage battery pack is controlled to be isolated, so that the average discharging depth of each storage battery pack is 20 to 30 percent; the reduced charging control voltage is used; at the third stage, when the real-time power consumption is raised to 80 percent or higher from a value not higher than 50 percent of the rated power consumption, all storage battery packs are controlled to perform grid-connection work; the voltage is recovered into the normal charging control voltage. Through at least twice regulation, the average discharging depth of the storage battery pack is regulated to 30 to 40 percent step by step.

Description

technical field [0001] The invention relates to spacecraft power supply control technology, in particular to a charging and discharging method based on the in-orbit memory reduction effect of a cadmium-nickel battery pack used in a spacecraft. Background technique [0002] As a mature chemical battery, nickel-cadmium battery packs are widely used in the aerospace field, especially in the field of manned spaceflight. They have been used as safe and reliable energy storage battery packs for the power system of the Shenzhou series of manned spacecraft. [0003] During the whole process of spacecraft flight, especially manned spacecraft with complex flight mode changes, the power consumption also changes frequently, resulting in an unstable state of discharge capacity and discharge depth of the nickel-cadmium battery pack. Taking the Shenzhou series of manned spacecraft as an example, during the entire flight process, the nickel-cadmium battery pack needs to experience the disch...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method of charging and discharging the nickel-cadmium battery pack used in spacecraft to reduce the memory effect in orbit, which can solve the safety and reliability of the power supply system caused by the memory effect of the nickel-cadmium battery pack during the flight of the spacecraft. sexual problems

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