A charging voltage autonomous switching control method for a spacecraft lithium battery

Abstract

The invention discloses a charging voltage autonomous switching control method of a spacecraft lithium battery. Aiming at the characteristics of varied states of a part of spacecraft cabin section combination bodies, high integration degree of equipment, complicated in-orbit flight procedures and segmental arc, and the like, charging voltage autonomous switching control of a multiplexed lithium ion storage battery unit for two cabin sections is realized by adopting a software control mode by a lower computer of a power supply system. During an in-orbit process, a lithium ion storage battery monomer and the group voltage can be autonomously detected through the lower computer and can be compared with a voltage threshold value of a preset monomer battery, and automatic switching control on charging final voltage of each cabin section on the storage battery can be realized through a method of autonomously regulating the voltage threshold value in a charging final voltage point when a certain monomer battery is in failure. According to the autonomous switching control method disclosed by the invention, the autonomous management capability of a spacecraft power supply system is increased, and overcharging of the lithium ion storage battery unit under the failure situation of an in-orbit monomer is prevented, so that the reliability of the spacecraft power supply system is greatly increased.

Description

technical field [0001] The invention relates to a charging voltage autonomous switching control method of a spacecraft lithium battery, belonging to the technical field of space power supplies. Background technique [0002] As a secondary battery with Li+ intercalation compounds as positive and negative active materials, lithium-ion batteries have gradually become the successor to nickel-cadmium batteries and nickel-hydrogen batteries in the field of space power supplies due to their high specific energy and many outstanding advantages such as high energy storage density. Then the third generation of space power. At present, lithium-ion batteries in the world have entered the stage of engineering application in the field of space power. As a secondary battery widely used in space power systems, its working condition directly affects the life of the spacecraft in orbit. Due to the special charging characteristics of lithium-ion batteries, if they continue to charge after re...

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Problems solved by technology

[0004] The technical problem of the present invention is: to overcome the deficiencies of the prior art, the present invention provides a method for autonomous switching control of the charging voltage of the lithium battery of the spacecraft, through which the lower computer independently detects the voltage of the storage battery pack and the projectile battery and automatically switches the control , improve the reliability of lithium battery overcharge protection, and solve the problem of low self-management level of traditional lithium batteries; through the cooperation of lower computer, hardware charging switching enable switch and charging voltage switching switch, it can effectively prevent lithium battery from overcharging phenomenon, which overcomes the problem that the traditional lithium battery overcharge protection is too dependent on ground control; through the hierarchical switching control for different compartments, the service life of the lithium battery is extended, and the traditional lithium battery overcharge protection circuit is only suitable for charging in a single compartment. pathway defect

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