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Method for predicting internal and external temperatures of power lithium battery

A technology of external temperature and prediction method, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., and can solve the problems of large error and small error range of state estimation.

Active Publication Date: 2020-11-13
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for predicting the internal and external temperature of a power lithium battery, which solves the problems of large state estimation errors caused by inaccurate models caused by different ambient temperatures in the prior art. and external temperature estimation can be controlled within a small error range

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  • Method for predicting internal and external temperatures of power lithium battery
  • Method for predicting internal and external temperatures of power lithium battery
  • Method for predicting internal and external temperatures of power lithium battery

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Embodiment Construction

[0097] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and fully convey the concept of example embodiments to those skilled in the art. The described features or characteristics may be combined in any suitable manner in one or more embodiments.

[0098] Such as figure 1 As shown, the present invention discloses a method for predicting the internal and external temperature of a power lithium battery, which specifically includes the following steps:

[0099] Step 1, constructing a lithium-ion battery electric-thermal coupling model considering the ambient temperature;

[0100] Step 2, parameter identification of the electric-thermal coupling model of the battery; specifically, the forgetting factor least ...

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Abstract

The invention provides a method for predicting internal and external temperatures of a power lithium battery, which comprises the following steps of: firstly, constructing a lithium ion battery electrothermal coupling model considering an environment temperature; recognizing parameters of the model through a forgetting factor least square method to obtain model parameters in different environments; then performing simulation level verification on the proposed lithium ion battery electrothermal coupling model established according to the parameter identification result according to dynamic working condition test data; and finally, constructing a state observer considering the environment temperature to verify the application level of the model. The method solves the problem that the state estimation error is large due to an inaccurate model caused by different environment temperatures, and plays an important role in the utilization efficiency and the service life of the power battery pack and the whole vehicle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for predicting internal and external temperatures of a power lithium battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in the field of electric vehicles due to their high specific energy, high specific power, no memory effect and long cycle life. Lithium-ion power battery is the main energy supplier of new energy vehicle (NEV), which has many advantages such as light weight, low discharge rate and high energy density, and has been widely used in NEV. The battery management system (Battery Management System, BMS) is very important for the safe and efficient operation of lithium batteries (in the appropriate voltage and operating temperature range) in electric vehicle applications. This system is usually connected in series / parallel configurations. battery cells to meet the high power and high vol...

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Application Information

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IPC IPC(8): G01R31/367G01R31/374
CPCG01R31/367G01R31/374
Inventor 庞辉郭龙武龙星牟联晶晋佳敏
Owner XIAN UNIV OF TECH
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