Temperature-compensation-function-contained method for estimating charge state of lithium battery

A state of charge and temperature compensation technology, which is applied in the direction of temperature compensation modification, measurement of electricity, measurement of electrical variables, etc., can solve problems such as easy divergence of estimation results and no consideration of temperature

Active Publication Date: 2019-06-18
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the current lithium battery state of charge estimation algorithm's dependence on the initial value, the estimation results are easy to diverge, and the influence of te

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  • Temperature-compensation-function-contained method for estimating charge state of lithium battery
  • Temperature-compensation-function-contained method for estimating charge state of lithium battery

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Embodiment Construction

[0083] The present invention will be further described below in conjunction with specific examples, so that those skilled in the art can better understand the present invention and implement it, but the given examples are not intended to limit the present invention.

[0084] A method for estimating the state of charge of a lithium battery with a temperature compensation function, comprising the following steps:

[0085] Step 1. Establish the equivalent circuit model of the second-order RC network of each single lithium battery.

[0086] Step 1.1. Under constant temperature conditions of 5°C, 20°C, and 40°C, conduct a dynamic pulse discharge experiment on the experimental lithium battery, where the dynamic pulse discharge curve at 20°C is as follows: image 3 shown.

[0087] Step 1.2. Based on the pulse discharge data measured in the experiment, use the least squares method to identify the parameters of the second-order RC network equivalent circuit model of the lithium batter...

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Abstract

Provided in the invention is a temperature-compensation-function-contained method for estimating the charge state of a lithium battery. On the basis of the second-order RC network equivalent circuit model of all single batteries, a temperature model of all single batteries of a lithium battery group is established by combining the thermodynamic first rule, the Fourier's law and Newton's law of cooling, wherein the temperature model includes internal heat generated by all single batteries, convection and heat exchange between all single batteries and an ambient environment, convection and heatexchange among all single batteries, and conduction and heat transfer between all single batteries. Because of establishment of the temperature model, the estimation precision of internal parameters,including the open circuit voltage, internal resistance, polarization internal resistance, and polarization voltage, of the equivalent circuit model of all single batteries is improved; and on the basis of the unscented Kalman filter algorithm, the SOC of each single battery is estimated and the estimation precision of the SOC of each single battery is improved by combining the UKF of the temperature model. Therefore, the technical means and support basis having the certain reference value can be provided for the estimation method research of the SOCs of all single batteries in the lithium battery group.

Description

technical field [0001] The invention belongs to the technical field of charging and discharging of lithium batteries, and in particular relates to a method for estimating the state of charge of a lithium battery with a temperature compensation function. Background technique [0002] With the gradual depletion of fossil energy such as coal and petroleum and people's continuous attention to environmental protection issues, electric vehicles that use power batteries as the main energy supply have attracted more and more attention due to their advantages of zero pollution and high energy saving efficiency. The rated voltage of single lithium battery products is 3.2V and 4.2V. If you want to meet the voltage and capacity required by the power battery, you need to connect a large number of single batteries in series and parallel to form a group. As one of the core components of electric vehicles, power batteries require real-time and accurate detection of their operating status. ...

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Application Information

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IPC IPC(8): G01R1/44G01R31/382
Inventor 杨宗霄蔡大明吴延峰李根生牛文琪
Owner HENAN UNIV OF SCI & TECH
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