Lithium ion power battery SOC dynamic estimation method and system, equipment and medium

A power battery and lithium-ion technology, applied in the field of dynamic SOC estimation of lithium-ion power batteries, can solve problems such as inability to balance accuracy and computational complexity, not being practical enough, and the SOC estimation method is not simple enough

Inactive Publication Date: 2021-07-06
GUANGDONG POLYTECHNIC NORMAL UNIV +1
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Problems solved by technology

However, the existing SOC estimation methods are not simple enough, not practical enough, and cannot balance accuracy and computational complexity to meet the real-time requirements of SOC estimation in practical applications.

Method used

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  • Lithium ion power battery SOC dynamic estimation method and system, equipment and medium
  • Lithium ion power battery SOC dynamic estimation method and system, equipment and medium
  • Lithium ion power battery SOC dynamic estimation method and system, equipment and medium

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Embodiment Construction

[0098] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0099] In one embodiment, such as figure 1 As shown, a method for dynamically estimating the SOC of a lithium-ion power battery is provided, including the following steps:

[0100] Step 101, modeling the equivalent circuit of the lithium-ion power battery, reading the parameters of the battery model and the initial battery SOC value, and using the least squares method to identify and calculate the parameters of the battery model to obtain corresponding model parameters;

[0101] Step 102, constructing a basic formula for power battery SOC estimation according to the model...

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Abstract

The invention relates to a lithium ion power battery SOC dynamic estimation method and system, equipment and a medium. The method comprises the steps of modeling an equivalent circuit of a lithium ion power battery, reading parameters of a battery model and an initial battery SOC value, and performing identification and calculation on the parameters of the battery model by adopting a least square method to obtain corresponding model parameters; constructing a basic formula for SOC estimation of the power battery according to the model parameters; reading the open-circuit voltage of the battery; and inputting the open-circuit voltage into a strong tracking Sigma point Kalman filtering model to estimate the SOC value of the lithium ion power battery. The method is simple and practical, precision and calculation complexity are considered, the requirement for SOC estimation real-time performance in practical application is met, and real-time dynamic estimation of the state of charge of the lithium ion power battery is achieved.

Description

technical field [0001] The present application relates to the technical field of lithium-ion power batteries, in particular to a method, system, device and medium for dynamically estimating the SOC of a lithium-ion power battery. Background technique [0002] With the rapid development of new energy vehicles, the main source of power for new energy vehicles is lithium-ion power batteries, which have the characteristics of high specific energy and long cycle life. The battery management system is the intelligent core and an important part of the new energy vehicle energy system. The capacity of the single battery is small, the voltage of the single battery is low, and it is difficult to meet the demand for high voltage and large capacity; Application requirements. The battery management system relies on high-precision sensors to sample parameters such as voltage, current, and temperature in real time, and then relies on these basic data to estimate indirect measurement vari...

Claims

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Application Information

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IPC IPC(8): G01R31/382
CPCG01R31/382
Inventor 欧阳剑向丹李菁莫志东
Owner GUANGDONG POLYTECHNIC NORMAL UNIV
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