Lithium battery capacity estimation method based on incomplete charging voltage curve
A charging curve and charging voltage technology, which is applied in the field of lithium battery capacity estimation based on incomplete charging voltage curves, can solve problems such as limited cycle life and battery performance degradation, and achieve the goals of reducing workload, saving time, and ensuring accuracy Effect
Active Publication Date: 2019-12-24
UNIV OF SHANGHAI FOR SCI & TECH
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0009] Although a lithium-ion battery is a device for energy storage and conversion, it is not infinitely usable, that is, its cycle life is limited, because the performance of the battery will gradually decline as the battery is used
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0027] After the present invention finds the capacity estimation terminal voltage reference point of the battery cell under different constant current charging conditions, it can successively reach the actual charging point of the two reference voltage points according to the terminal voltage of the battery cell under a certain constant current charging condition. The input power accurately estimates the current battery capacity.
[0028] For the capacity estimation of the lithium battery, specifically include the following steps:
[0029] S1. Obtain the constant current charging time and voltage charging curves of the battery at different currents at different aging stages from the beginning of the battery life to the end of the battery life through experiments.
[0030] In the embodiment of the present invention, under the constant current charging condition of the lithium-ion battery, three curves of initial aging, mid-term aging and late aging (90% of the initial capacity ...
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 battery capacity estimation method based on an incomplete charging voltage curve, and the method comprises the steps: firstly obtaining the constant-current chargingvoltage data of a battery at different aging stages from an initial aging moment to the ending of the service life under the conditions of household charging current, slow charging and quick chargingthrough an experiment; secondly carrying out the equal scaling of the constant-current charging time-voltage curve at different aging stages under the same current, and then finding two reference voltage points to enable the two voltage points on each of all constant-current charging time-voltage curves equally scaled under the current to coincided with each other in a better way after translation; and estimating the current capacity of the battery according to the duration of the actual moments when an end voltage of a cell under the constant-current charging condition arrives at the two reference voltage points. The method achieves the estimation of the capacity of the lithium battery through the incomplete charging voltage curve, thereby guaranteeing the capacity estimation precision,saving the time to the greatest extent, and reducing the workload.
Description
technical field [0001] The invention relates to a lithium battery detection technology, in particular to a lithium battery capacity estimation method based on an incomplete charging voltage curve. Background technique [0002] The capacity of the battery is an important index to measure the performance of the battery. It is generally expressed in ampere hours. The general term for discharge time (hours) and discharge current (ampere), that is, capacity = discharge time × discharge current. The actual capacity of the battery depends on The amount of active material in the battery and the utilization rate of the active material. The more the active material is, the higher the utilization rate of the active material is, and the larger the capacity of the battery is. On the contrary, the smaller the capacity, there are many factors affecting the battery capacity. Common There are the following types: [0003] (1) Effect of discharge rate on battery capacity [0004] The batter...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/388G01R31/392
CPCG01R31/388
Inventor 郑岳久王晶晶高文凯来鑫周龙刘金海
Owner UNIV OF SHANGHAI FOR SCI & TECH