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Identification method for lumped thermal parameters of lithium ion battery

A lithium-ion battery and identification method technology, which is applied in the field of identification of lumped thermal parameters of lithium-ion batteries, can solve the problems that the specific heat capacity test relies on expensive equipment, is difficult to estimate accurately, and is difficult to test thermal conductivity online, so as to achieve reliable identification and improve accuracy , the effect of improving the estimation accuracy

Active Publication Date: 2017-08-18
BEIJING JIAOTONG UNIV +1
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Problems solved by technology

[0006] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method for identifying lumped thermal parameters of lithium-ion batteries, which can improve the specific heat capacity test in the prior art, which relies on expensive equipment, is difficult to test online, and is difficult to accurately estimate thermal conductivity. question

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  • Identification method for lumped thermal parameters of lithium ion battery
  • Identification method for lumped thermal parameters of lithium ion battery
  • Identification method for lumped thermal parameters of lithium ion battery

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Embodiment Construction

[0043] The following specific embodiments take a ternary material power battery as an example for description.

[0044] Such as Figure 1-9 As shown, a method for identifying lumped thermal parameters of lithium ion includes the following steps:

[0045] S1. When there is no external current excitation, let the battery stand for a period of time at a certain temperature in the incubator, then adjust the temperature of the incubator to another temperature, and test the battery temperature and ambient temperature in real time during the temperature change;

[0046] S2. Make the difference between the battery temperature obtained by the test and the ambient temperature to obtain the battery temperature difference, and then differentiate the battery temperature difference with time to obtain the thermal time constant of the battery. The calculation formula is

[0047]

[0048] Where τ T Is the thermal time constant, T b Is the battery temperature, T a Is the ambient temperature;

[0049] S...

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Abstract

The invention discloses an identification method for lumped thermal parameters of a lithium ion battery. The identification method for the lumped thermal parameters is based on an lumped thermal equivalent circuit and special signal stimulation and by combination with a mathematical algorithm; according to the method, temperature rise of the battery is simulated based on the lumped thermal equivalent circuit; a thermal time constant in the environment is obtained by a temperature change experiment; a functional relation between impedance and temperature is established according to impedance at different temperatures; and by applying sine alternating current with single frequency and amplitude, relatively high accuracy of a battery thermal model is ensured; according to a battery temperature rise model and the functional relation between impedance and temperature, temperature change of the battery under special stimulation is circulated; and an actually-tested battery temperature is approached through a search iterative algorithm, so as to identify specific heat capacity and heat resistance of the battery. According to the method, complex test equipment, such as a heat insulating calorimeter, an isothermal calorimeter and other expensive thermal test equipment are not needed; and in addition, the method has the advantages of simplicity and reliability in identifying thermal parameters of the lithium ion battery, easy realization of engineering and the like.

Description

Technical field [0001] The invention relates to the technical field of battery thermal parameter measurement, in particular to a method for identifying the lumped thermal parameters of a lithium ion battery, especially a method for measuring the lumped thermal parameters of a lithium ion battery by combining sinusoidal current heating and air cooling. Background technique [0002] The dual pressure of energy shortage and environmental pollution has boosted the rapid development of electric vehicles. Lithium-ion batteries (lithium batteries) have the advantages of high cell voltage, high energy density, long life, no memory effect and no pollution, and become the power of electric vehicles. The battery of choice for drive. [0003] The accurate identification of thermal parameters of lithium-ion batteries is the key to battery thermal management. The existing thermal parameter identification methods generally rely on thermal testing equipment such as calorimeters, such as adiabatic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/48
CPCH01M10/486Y02E60/10
Inventor 金文斌阮海军孙丙香姜久春李雪飞张维戈王占国龚敏明
Owner BEIJING JIAOTONG UNIV
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