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Lithium ion battery pack residual capacity estimation method for deep space exploration

A technology of lithium-ion battery pack and remaining capacity, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of inaccurate estimation results and current accumulation errors that cannot be corrected.

Active Publication Date: 2021-06-04
BEIJING INST OF SPACECRAFT SYST ENG +1
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Problems solved by technology

At present, the ampere-hour integration method is the most commonly used method for estimating the state of charge of the battery, but this method is an open-loop method, and the long-term current accumulation error cannot be corrected, which will lead to inaccurate estimation results

Method used

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  • Lithium ion battery pack residual capacity estimation method for deep space exploration
  • Lithium ion battery pack residual capacity estimation method for deep space exploration
  • Lithium ion battery pack residual capacity estimation method for deep space exploration

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Embodiment Construction

[0035] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] A method for estimating the remaining capacity of a lithium-ion battery pack for deep space exploration provided by the present invention, such as figure 1 As shown, it specifically includes the following steps:

[0037] Step 1. Conduct constant current charge and discharge ground tests with a current less than a predetermined rate, establish a pseudo-open-circuit voltage response surface model of the battery pack, and form a data table reflecting the relationship between different battery pack temperat...

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Abstract

The invention provides a lithium ion battery pack residual capacity estimation method for deep space exploration, which breaks through the limitation of a traditional method for estimating the state of charge of the battery pack by purely depending on an ampere-hour integral method or a voltage look-up table method, and comprehensively utilizes the advantages of the two methods. The real-time performance of the algorithm is ensured, and meanwhile, a voltage look-up table closed loop is introduced to correct a charge state estimation result, so that the problem that the estimation result is invalid due to open-loop cumulative estimation errors of an ampere-hour integral method is effectively avoided, and the originally divergent estimation result is subjected to regression convergence again.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery monitoring and management, and in particular relates to a method for estimating the remaining capacity of a lithium-ion battery pack used in deep space exploration. Background technique [0002] As one of the main energy sources of deep space exploration aircraft, the lithium-ion battery pack has a crucial influence on the decision-making and planning of the mission to be performed. However, due to the nonlinear and time-varying characteristics of lithium-ion batteries, it is already difficult to accurately obtain the remaining power under ordinary working conditions, and the deep space environment makes the difficulty further increased. The remaining capacity of the battery can be indirectly represented by the state of charge of the battery, so the estimation of the remaining capacity of the battery pack can be transformed into the estimation of the state of charge of the battery pack...

Claims

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Application Information

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IPC IPC(8): G01R31/3842
CPCG01R31/3842Y02E60/10
Inventor 穆浩熊瑞汪静刘治钢王榘朱立颖杨东
Owner BEIJING INST OF SPACECRAFT SYST ENG
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