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Method for estimating SOE (State of Energy) of 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: 2015-09-30
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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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

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  • Method for estimating SOE (State of Energy) of lithium iron phosphate battery
  • Method for estimating SOE (State of Energy) of lithium iron phosphate battery
  • Method for estimating SOE (State of Energy) of lithium iron phosphate battery

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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] Such as 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) ...

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Abstract

The invention provides a method for estimating the SOE (State of Energy) of a lithium iron phosphate battery. According to the method, an SOE mathematic estimation model including electric energy and heat energy is established according to the composition form of internal energy of the lithium iron phosphate battery. The external consumed electric energy as well as ohm heat energy, polarization heat energy and entropy generation heat energy in the battery in the battery discharge process are estimated at different discharge rates, the maximum available energy at various discharge rates is acquired, the maximum theoretical total energy and the efficiency function relation at various discharge rates are acquired through simulation, and the total energy of the estimation model is corrected in real time, so that the estimation accuracy of the SOE of the battery is effectively improved. The heat energy form is introduced to perfect types of energy consumption in the battery discharge process, meanwhile, the total release energy in the estimation process is adjusted in real time according to the maximum theoretical total energy and the energy release efficiency, so that the model is closer to the actual working condition, and the method has the advantages of physical concept clearness, high estimation accuracy and the like.

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 battery capacity state SOC (State of Charge, that is, the state of charge, also called the remaining power) is indirectly expressed and the remaining en...

Claims

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Application Information

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Patent Type & Authority Applications(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
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