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An identification method for lumped thermal parameters of lithium-ion batteries

A technology of a lithium ion battery and an identification method is applied in the identification field of the lumped thermal parameters of the lithium ion battery, which can solve the problems of difficulty in online testing of thermal conductivity, dependence on expensive equipment for specific heat capacity testing, and difficulty in accurate estimation, etc., so as to achieve reliable identification and improve accuracy. , the effect of improving the estimation accuracy

Active Publication Date: 2019-08-02
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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  • An identification method for lumped thermal parameters of lithium-ion batteries
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  • An identification method for lumped thermal parameters of lithium-ion batteries

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Embodiment Construction

[0043] The following specific embodiments are described by taking a ternary material power battery as an example.

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

[0045] S1. In the case of no external current excitation, let the battery stand at a certain temperature in the incubator for a period of time, 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 process;

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

[0047]

[0048] Among them, τ T is the thermal time constant, T b is the battery temperature, T a is the am...

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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 lumped thermal parameters of lithium-ion batteries, especially a method for measuring lumped thermal parameters of lithium-ion batteries 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 single voltage, high energy density, long life, no memory effect and no pollution, and have become the power of electric vehicles. Preferred battery for driving. [0003] Accurate identification of thermal parameters of lithium-ion batteries is the key to battery thermal management. Existing thermal parameter identification methods generally rely on thermal testing equipment such as calorimeters, such as adiabatic calo...

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Application Information

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Patent Type & Authority Patents(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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