Spatial lithium-ion battery accelerated degradation test time equivalency modeling method

Abstract

The invention provides a spatial lithium-ion battery accelerated degradation test time equivalency modeling method. For lithium-ion batteries for spatial application, the process of constructing a degradation life test model is described, and an effective accelerated life test model is provided; it is indicated that in spatial lithium-ion battery ground test, operating time under doubled current operating condition (referred to as DDC hereinafter) is about 0.39 times that under actual in-orbit simulated operating condition (referred to as SN hereinafter). Comprehensive statistical analysis is provided for the data for the acceleration test model, data modeling feasibility is characterized clearly, and ineffective work for acceleration modeling for blind application data is avoided. By using various expression modes, life probability density function for each working condition is acquired, life distribution value with acceleration stress being other value is acquired effectively, and lives under different check conditions and acceleration conditions and parameter values under different operating times are acquired quickly.

Description

technical field [0001] The invention relates to a time equivalent modeling method based on a space lithium ion battery ADT (Accelerated Degradation Test, accelerated degradation test), and belongs to the technical field of equivalent modeling methods. Background technique [0002] With the application and popularization of lithium-ion batteries, the requirements for their service life are gradually increasing. Currently, low-Earth orbit (low-Earth orbit) satellites are designed for a service life of 5-8 years. As the only energy source for satellites to operate during the Earth shadow period, the safe and reliable operation of lithium-ion batteries is a prerequisite for ensuring the life of satellites and other space vehicles in orbit. For long-term aerospace missions, the test cycle of full-life cycle batteries is long and costly, making it difficult to achieve. Therefore, in order to obtain more reliable and accurate degradation trend and reliability estimation of remain...

AI Technical Summary

Problems solved by technology

However, there is still a lack of available ADT models for space lithium-ion batteries, and a lack of accelerated life test methods under the premise that the degradation characteristics remain unchanged under space application conditions, which severely restricts the reliability test time consumption of ground lithium-ion batteries and limits The rapid promotion of models and the restriction of the overall model application cycle of spacecraft

Images