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Lithium battery parameter identification method based on composite working condition

A technology of parameter identification and compound engineering, applied in the measurement of electricity, electric vehicles, and measurement of electrical variables, etc., can solve the problem that a single working condition cannot obtain comprehensive and accurate parameter values, and achieve good dynamic and static characteristics, strong robustness awesome effect

Active Publication Date: 2019-01-01
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a lithium battery parameter identification method based on composite working conditions, which solves the problem in the prior art that a single working condition cannot obtain comprehensive and accurate parameter values ​​when identifying multi-level model parameters

Method used

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  • Lithium battery parameter identification method based on composite working condition

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Embodiment 1

[0044] Embodiment 1: This embodiment is a battery management system based on a ternary lithium battery (model Sanyo NCR18650B). First, the battery capacity is tested according to the industry standard, and the working condition test is carried out based on this capacity.

[0045] refer to figure 1 , a compound working condition consists of 10 cycles, each cycle includes a rapidly changing charge and discharge phase, a constant current discharge phase, and a voltage recovery phase. The rapidly changing charge and discharge stage is a process in which the current changes drastically, and the constant current discharge stage is a process in which the current remains constant for a long time.

[0046] In this example, the capacity of the ternary lithium battery is about 3.2AH, the discharge capacity is set to 0.3AH each time, the discharge current is 1A, and the discharge time is 1080s; After returning to the steady state, the open circuit voltage of the battery can be obtained. ...

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Abstract

The invention, which belongs to the technical field of battery management, relates to a lithium battery parameter identification method based on a composite working condition. The composite working condition is formed by N groups of cycles. Each cycle group includes a rapidly changing charge and discharge stage, a constant-current discharge stage, and a standing stage. At the standing stage of anycycle, tau2 is estimated according to a relationship between a battery terminal voltage and time; at the constant-current discharge stage of any cycle, the sum of three internal resistors R0, R1, andR3 is calculated based on the Ohm's law; for the first cycle by starting with SOC being equal to 100%, next cycle parameters R2 and C2 are used for replacement to avoid introduction of too many errors; and corresponding groups of battery model data are identified by the N cycle groups and a full-SOC-range battery model is constructed based on a table looking + linear interpolation method. According to the total capacity, the SOC corresponding to the battery after each constant-current discharge condition is calculated, open-circuit voltages under all SOCs are recorded, and a complete SOC-OCVcurve is obtained by fitting. The lithium battery parameter identification method has the following advantages: the parameter identification under different working conditions is considered fully; andthe robustness is high.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a lithium battery parameter identification method based on composite working conditions. Background technique [0002] With the rapid development of electric vehicles in recent years, the research around lithium-ion batteries continues to deepen, among which the SOC evaluation algorithm is one of the hot research areas, and an accurate battery model is of great significance for SOC estimation. Currently, battery models are mainly electrochemical models and equivalent circuit models. The equivalent circuit model uses the circuit network to equivalent some external characteristics of the lithium battery. Because of its simple structure, easy calculation, and clear parameter meaning, it is widely used in the battery management system and plays an important role in impedance analysis and SOC estimation. The commonly used equivalent circuit models mainly include Rint model...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCY02T10/70
Inventor 周娟樊晨化毅恒贺鹏飞杜少通王江彬原亚雷刘凯校乾坤兰海常文宇孙宁王耀萱赵晨林朋辉刘刚
Owner CHINA UNIV OF MINING & TECH
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