Ground charging method and system for satellite lithium battery

Abstract

The invention discloses a ground charging method and system for a lithium battery used for a satellite. According to the ground charging method, the lithium battery is pre-charged by trickle current to enable the voltage of the lithium battery to reach the initial voltage; then the lithium battery is charged by constant current until the upper limit voltage is reached; the process of decreasing the charging current and continuously charging the lithium battery until the upper limit voltage is reached is implemented for multiple times; and the charging process is finished when the current is decreased to the trickle current value and the upper limit voltage of the lithium battery is achieved through continuous charging. The system for implementing the ground charging method comprises a power supply, a charging power supply, a switch and a controller, wherein the controller controls the power supply and the charging power supply to supply power to the lithium battery. By adoption of the method and the system provided by the invention, the lithium battery can be fully charged; multiple times of charging for a certain test project can be avoided; and the risk of shortening the service life of the battery is greatly lowered.

Description

technical field [0001] The invention relates to a ground charging method and system for satellite lithium batteries, which are suitable for ground charging of satellite lithium batteries. Background technique [0002] Lithium-ion batteries have high weight / volume ratio energy, which can increase the load ratio of satellite platforms and reduce launch costs. At the same time, lithium-ion batteries have the advantages of small thermal effect, small self-discharge, and easy modularization. They have obvious advantages in aerospace applications. It has become the third generation of aerospace energy storage power after nickel-cadmium and nickel-hydrogen batteries. [0003] Projects such as the satellite full-star test, pyrotechnic program control function test, and three-system joint test all require lithium batteries to supply power, especially before the satellite is about to be launched. The battery needs to be fully charged. The traditional satellite nickel-hydrogen battery...

AI Technical Summary

Problems solved by technology

The traditional satellite nickel-hydrogen battery charging method is to use constant current charging, but this method is directly applied to lithium batteries, and there will be a problem that the lithium battery cannot be fully charged. In order to meet the requirements of a certain test item, it can only be charged multiple times.

[0004] Since lithium batteries must be connected in series in order to meet the requirements of the operating voltage, there is inconsistency between the individual batteries in the battery pack, and the difference caused by continuous charge and discharge cycles will accelerate the capacity decay of some individual batteries. The capacity of the battery pack is determined by the minimum capacity of the single battery, so these differences will shorten the service life of the battery pack

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