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A Modeling Method for Series Battery System Based on Parameter Corrector

A battery system and parameter calibration technology, which is applied in the direction of instruments, electrical digital data processing, special data processing applications, etc., can solve the problems of inconsistency in the performance parameters of battery cells, and achieve the effect of high prediction accuracy

Active Publication Date: 2018-09-07
湖南久普能源科技有限公司
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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a serial battery system modeling method based on a parameter corrector, which solves the problem that the battery performance parameters (such as voltage, current, etc.) And the problem that the charging and discharging characteristics are difficult to be accurately measured and estimated, to achieve the purpose of accurately predicting the charging and discharging characteristics of the series battery system

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  • A Modeling Method for Series Battery System Based on Parameter Corrector
  • A Modeling Method for Series Battery System Based on Parameter Corrector
  • A Modeling Method for Series Battery System Based on Parameter Corrector

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with specific examples, which are for explanation of the present invention rather than limitation.

[0022] 1. Series battery system and battery cell model

[0023] 1.1 Series battery system

[0024] The series battery system is composed of three battery cells connected in series, and its structure diagram is as follows: figure 1 shown. The rated voltage of each battery cell is 3.7V, the rated capacity is 860mAh, and the discharge cut-off voltage is 3V.

[0025] 1.2 Equivalent circuit model of battery cell

[0026] The equivalent circuit model of a battery cell is a second-order equivalent circuit model. The main circuit of the model consists of two RC parallel circuits, a controlled voltage source U 0 (SOC) and battery internal resistance R, etc., the circuit diagram is as follows figure 2 As shown, the mathematical model expression is: U(t)=U 0 [SOC(t)]-I(t)[R(t)+R s (t) / R s (t)jωC...

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Abstract

The invention discloses a parameter corrector based tandem battery system modeling method. A tandem battery system is formed by connecting N battery monomers in series. The method comprises following steps of building a battery system mean value model by use of working characteristics of a series circuit and a screening method according to the known performance parameters of a lithium ion battery monomer; designing a parameter corrector by use of the difference value of a terminal voltage measured value of the battery system and a terminal voltage simulation value of a mean value model as well as state of charge (SOC) of the mean value model; and finally, using the SOC acquired by the parameter corrector as input, and updating the mathematical relation between performance parameters of all battery monomers in the parameter mean value model and performance parameters of the battery system, so as to build a tandem battery system model. The tandem battery system model established by the method can simulate the charging and discharging working characteristics of the tandem battery system more effectively. The modeling method can be applicable to both battery monomers tandem and battery modules tandem.

Description

technical field [0001] The invention belongs to the technical field of design and control of a MW-level battery energy storage system in a smart grid, and relates to a modeling method for a series battery system based on a parameter corrector. Background technique [0002] Due to its high specific energy, long cycle life, low self-discharge, and no memory effect, lithium-ion batteries have been more and more widely used in new energy, transportation, aerospace and other fields. At the same time, due to the relatively small rated capacity and rated voltage of lithium-ion battery cells, multiple battery cells are often connected in series to form a battery system, that is, a series battery system, which can realize the expansion of the capacity and voltage level of the battery system. However, due to the inconsistency of battery cells, and the performance parameters of lithium-ion batteries (such as battery terminal voltage, internal resistance, capacity, etc.) The working ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 彭思敏胡国文薛迎成何坚强王建冈阚加荣
Owner 湖南久普能源科技有限公司
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