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Lithium ion battery state of health estimation method

A lithium-ion battery, health state technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of difficult parameter acquisition, inappropriate online real-time application, etc., achieve rapid screening performance, overcome the test system or test equipment, Practical effect

Active Publication Date: 2018-03-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for estimating the state of health of a lithium-ion battery to solve the problem that the existing method for estimating the state of health of the lithium-ion battery requires specific test experiments or specific test equipment, which makes it difficult to obtain parameters and is not suitable for online real-time applications.

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  • Lithium ion battery state of health estimation method
  • Lithium ion battery state of health estimation method
  • Lithium ion battery state of health estimation method

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specific Embodiment approach 1

[0021] Embodiment 1: This embodiment describes a method for estimating the state of health of a lithium-ion battery, and the method for estimating the state includes the following steps:

[0022] Step 1: Obtain the discharge voltage, discharge current, and discharge time data of the lithium-ion battery before and after aging and charging and discharging with a certain working system; the working system includes charging and discharging mode, charging and discharging current and temperature;

[0023] Step 2: Intercept the discharge voltage, discharge current, and discharge time data of the data obtained in step 1 within the same SOC range;

[0024] Step 3: Propose the expression of the indicator factor of the state of health of the lithium-ion battery:

[0025]

[0026] Wherein, the HI is the state of health value of the lithium-ion battery, t 01 is the starting time of the battery corresponding to the same state of charge interval before aging, t 0 is the starting time of...

specific Embodiment approach 2

[0029] Embodiment 2: In the method for estimating the state of health of a lithium-ion battery described in Embodiment 1, in step 1, the working system is that the temperature and current are the same or the changes are the same in the front and back cycles.

specific Embodiment approach 3

[0030] Specific embodiment three: a kind of method for estimating the state of health of a lithium-ion battery described in specific embodiment one, the specific process of step one is:

[0031] Use a certain working system to charge and discharge the lithium-ion battery before and after aging, and obtain the discharge voltage, discharge current, and discharge time data of the lithium-ion battery at different aging stages. like figure 1 Shown is an example diagram of charging a lithium-ion battery to 100% state of charge by constant current and constant voltage method, and then discharging to 70% state of charge by constant current method. The charging and discharging system adopted by the curve in the figure remains the same before and after the aging of the lithium-ion battery.

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Abstract

The invention relates to a lithium ion battery state of health estimation method. The method includes the following steps that: discharging voltage, discharging current, and discharging time data during the charging and discharging of a lithium ion battery which are performed under a certain working system before and after the aging of the lithium ion battery are obtained; discharging voltage, discharging current, and discharging time data during identical state of charge intervals are intercepted from the data which are obtained in the first step; the state of health indication factor expression of the lithium ion battery is defined; the value of Vlower limit in the third step is obtained; and an HI value in the formula is obtained, and the state of health of the battery is obtained. According to the lithium ion battery state of health estimation method of the invention, the state of health of the lithium ion battery is estimated according to the apparent data (discharging voltage, discharging current, and discharging time data) which can be measured in real time during the work of the battery. The lithium ion battery state of health estimation method of the invention has he advantages of easiness in parameter acquisition, high applicability and real-time application. The lithium ion battery state of health estimation method can be easy to embed a battery management system toestimate the state of health of a battery. The lithium ion battery state of health estimation method can assist in greatly eliminating the defects of existing test systems or test equipment, and is very practical.

Description

technical field [0001] The invention relates to a method for estimating the state of health of a lithium ion battery. Background technique [0002] The state of health (State of Health, SOH) of a lithium-ion battery is often used to characterize the aging degree of the battery. At present, there are two main definition methods, one: the maximum available capacity of the battery after aging and the maximum available capacity of the battery when it is fully healthy Percentage; Two: The percentage of the impedance of the battery after aging and the impedance of the battery when it is fully healthy. Accurate and timely estimation of the state of health of the battery is not only of great significance for the safe and efficient operation of the battery, but also can provide data support for the prediction of the battery's remaining usable life. [0003] In the existing methods for estimating the state of health of lithium-ion batteries, the acquisition of the capacity value need...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/392G01R31/396
Inventor 尹鸽平杨杰杜春雨高云智左朋建程新群马玉林
Owner HARBIN INST OF TECH
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