A method for estimating the energy state soe of a lithium iron phosphate battery
A lithium iron phosphate battery, energy state technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve the problem of inaccurate SOE estimation, and achieve the effect of improving the type of energy loss and improving the estimation accuracy
Active Publication Date: 2017-11-07
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to provide a method for estimating the state of energy SOE of a lithium iron phosphate battery to solve the problem of inaccurate estimation of the SOE of the current state of battery energy
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] The content of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0028] like figure 1 As shown, the method for estimating the state of energy SOE of the lithium iron phosphate battery comprises the following steps:
[0029] (1) Establish a SOE mathematical estimation model including two forms of energy loss, electric energy and heat energy. Electric energy is the sum of the energy provided by the battery to the outside, and heat energy is the sum of the ohmic heat energy, polarization heat energy and entropy heat generated inside the battery;
[0030] (2) Take the cut-off voltage a of lithium iron phosphate battery 1 V, safe temperature b 1 ℃ is used as the cut-off condition of the battery discharge, the battery is discharged at different rates, and the maximum available energy at each discharge rate is obtained from the calculated electric energy and heat energy;
[0031] (3) The...
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 provides a method for estimating the state of energy (State of Energy, SOE) of a lithium iron phosphate battery, that is, according to the internal energy composition form of the lithium iron phosphate battery, an SOE mathematical estimation model including electric energy and thermal energy is established. By measuring and calculating the external power consumption of the battery during the discharge process and the internal ohmic heat energy, polarization heat energy and entropy heat production energy of the battery at different discharge rates, the maximum available energy at various discharge rates is obtained, and the maximum theoretical total energy and various The efficiency function relational expression under the discharge rate corrects the total energy in the estimation model in real time, thereby effectively improving the estimation accuracy of the battery state of energy SOE. The invention introduces the form of thermal energy to improve the types of energy consumption in the battery discharge process, and at the same time adjusts the total released energy in the estimation process in real time with the maximum theoretical total energy and energy release efficiency, so that the model is closer to the actual working conditions and has clear physical concepts. The advantages of high estimation accuracy.
Description
technical field [0001] The invention belongs to the technical field of lithium iron phosphate batteries, in particular to a method for estimating the SOE (State Of Energy) of the lithium iron phosphate battery. Background technique [0002] The occurrence of smog, especially the health problems caused by PM2.5 particles and the inherent "intermittent and random" characteristics of new energy applications have further promoted the application of battery energy storage systems to replace fossil energy in vehicles. With the large-scale application of energy storage devices, a single battery state of charge parameter cannot meet the realistic requirements, and a large number of researches on battery energy state estimation have emerged. [0003] The remaining energy of the battery is generally estimated in two ways, that is, the indirect representation of the battery capacity state SOC (State of Charge, that is, the state of charge, also called the remaining power) and the remai...
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): G06F19/00
Inventor 冯自平罗玲林仕立宋文吉吕杰韩颖
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI