Lithium ion battery state of health estimation method
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF5 Cites 14 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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 o
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
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.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more