Method for estimating on-orbit service life of lithium ion battery for spaceflight

Abstract

The invention discloses a method for estimating the on-orbit service life of a lithium ion battery for spaceflight, which belongs to the technical field of spacecraft power supplies. The method comprises the following steps of firstly, measuring the median voltage of the lithium ion battery in ground and space environments, calibrating the ground and space performance difference of the lithium ion battery, then proposing a life estimation process based on an autoregressive integral moving average (ARIMA) model, and by adopting the estimation process, taking on-orbit capacitance cycle data of the lithium ion battery as a basis, conducting lithium ion battery cycle life prediction, and finally, according to the on-orbit operation rule of the spacecraft, converting the cycle life of the lithium ion battery obtained through estimation into the on-orbit working life. According to the method, the problem that the result is inaccurate when dynamic multi-step prediction is carried out based on a traditional ARIMA model is solved, and accurate prediction and dynamic evaluation of the on-orbit service life of the aerospace lithium ion battery under the condition that the actual value of a lag dependent variable cannot be obtained are achieved.

Description

technical field [0001] The invention belongs to the technical field of spacecraft power supplies, and in particular relates to a method for estimating the on-orbit working life of a lithium-ion battery used in aerospace. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high safety, long cycle life, high charge-discharge rate, wide operating temperature range, and low environmental pollution. They are more and more widely used in the aerospace field. At present, lithium-ion batteries have entered the In the application stage of aerospace engineering, many on-orbit spacecraft have adopted lithium-ion batteries as energy storage devices for power systems, replacing traditional nickel-metal hydride and nickel-cadmium batteries. Due to the high cost of space launch and the high requirements of space applications, in order to better serve the spacecraft and ensure the smooth realization of the established space missions, it is n...

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Problems solved by technology

[0008] The main purpose of the present invention is to provide a method for estimating the on-orbit working life of lithium-ion batteries used in aerospace, aiming to solve the problem of dynamic prediction and evaluation of the on-orbit working life of lithium-ion batteries when the actual value of the lagging dependent variable cannot be obtained

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