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Estimation method for SOC of lithium battery

A lithium battery, SOC-V technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of high requirements for correction conditions, achieve the effect of low estimation error and improve estimation accuracy

Active Publication Date: 2019-06-11
SHANGHAI MAKESENS ENERGY STORAGE TECH CO LTD
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Problems solved by technology

[0007] In order to solve the existing problems, the present invention provides a method for estimating the SOC of lithium batteries, which solves the problems that the existing estimation methods are prone to error accumulation and require high correction conditions.

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  • Estimation method for SOC of lithium battery
  • Estimation method for SOC of lithium battery
  • Estimation method for SOC of lithium battery

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Embodiment Construction

[0044] The specific implementation manners of the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0045] As we all know, the ampere-hour integration method is the SOC estimation method with the simplest principle and the most widely used method, and it is also the method used as the basis of the present invention for innovative correction. The principle of the traditional ampere-hour integration method is to detect the charge and discharge current I of the battery, which is positive when charging and negative when discharging, and integrates it to calculate the charge A) of the battery. The initial state of charge of the first charge or discharge, the rated capacity and the charge and discharge time can be used to obtain the current SOC of the battery. The specific formula is as follows:

[0046]

[0047] Among them, SOC 0 Indicates the state of charge of the corresponding battery at the beginning of charging and discharg...

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Abstract

The invention relates to the technical field of battery capacity calculation, and discloses an estimation method for SOC of a lithium battery. The method comprises the following steps of firstly obtaining a charging / discharging SOC-V curve under the conditions of different temperatures, current power and circulation times according to historical data of a lithium battery to be estimated through data fitting; calculating the point with the maximum curvature in each point at the front end of the curve as a front turning point and the point with the maximum curvature in each point at the back endas the back turning point; then, performing data fitting on the front turning point and the back turning point under the conditions of different temperatures, current power and circulation times; performing calculation to obtain a turning point modification coefficient equation under the corresponding condition; then, calculating the front turning point and the back turning point under the conditions of the reference temperature, the reference current power and the first circulation time and the corresponding SOC; performing conversion to obtain the front turning point and the back turning point under the corresponding work conditions by using the turning point modification coefficient equation; finally recording the turning point voltage reaching moment of the lithium battery to be estimated under the located work condition; and replacing the moment by the corresponding SOC value to obtain the SOC.

Description

technical field [0001] The invention relates to the technical field of battery capacity, in particular to a method for estimating the SOC of a lithium battery. Background technique [0002] With the development of the automobile industry, with the society's increasingly stringent requirements for energy saving, environmental protection and safety of automobiles, other energy sources must be used to provide power for automobiles, a daily product, and electric vehicles have taken advantage of the trend. Due to the economy of the storage battery and the maturity of its technology, it must be the main energy source of electric vehicles in the near future and for a long period of time in the future, and lithium-ion batteries have high energy, high battery voltage, wide operating temperature range, storage Long life and other advantages have become one of the main power sources of electric vehicles in the 21st century. Just as ordinary vehicles must monitor the fuel capacity in t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3828
Inventor 黄碧雄王一全严晓刘东王影
Owner SHANGHAI MAKESENS ENERGY STORAGE TECH CO LTD
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