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
CN107069131BActive Publication Date: 2019-08-02BEIJING JIAOTONG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING JIAOTONG UNIV
Publication Date
2019-08-02

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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.
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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...

Claims

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