Power battery temperature prediction model based on liquid cooling heat dissipation mode and modeling method

A liquid-cooled heat dissipation, predictive model technology, applied in computer-aided design, design optimization/simulation, calculation, etc., can solve problems such as the limitation of use range

CN111191366APending Publication Date: 2020-05-22CHINA FIRST AUTOMOBILE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-05-22

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Abstract

The invention discloses a power battery temperature prediction model based on a liquid cooling heat dissipation mode and a modeling method. The change relation of equivalent heat dissipation parameters between the battery and the cooling liquid along with the flow and the equivalent heat dissipation parameters between the battery and the air are calibrated through tests and the calibration resultis calibrated, and the change relationship between the battery internal resistance and the entropy thermal coefficient representing the reversible heat of the battery along with the SOC, the temperature and other factors are considered so as to establish a prediction model capable of predicting the temperatures of the battery cells at different positions in the battery pack in different thermal management stages. The model established according to the method can be used for real-time estimation and thermal management control of the temperature of the single battery in the liquid-cooled power battery pack and can expand the application range of the model, reduce the complexity of the model, simplify the input parameters of the model and improve the reliability of model operation on the basis of ensuring the simulation precision.
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Description

technical field

[0001] The invention relates to the technical field of batteries, and relates to a power battery temperature prediction model and a modeling method based on a liquid cooling heat dissipation method. Background technique

[0002] With the continuous popularization of new energy vehicles, power batteries are an important part of the three-electric system of new energy vehicles, and their safety, reliability and durability have attracted more and more attention from professionals and end users. At present, new energy vehicles on the market mainly use lithium-ion batteries, whose performance is highly sensitive to temperature changes. The discharge energy and output power of batteries will vary under different temperatures, which will affect the power and economy of the vehicle. At the same time, too high or too low temperature also has a certain impact on the service life of the battery. Therefore, during the use of the vehicle and the power battery, it is nece...

Examples

Embodiment Construction

[0151] The present invention provides a power battery temperature prediction model and modeling method based on liquid cooling and heat dissipation. The modeling process is as follows:

[0152] (1) Establish the thermodynamic equation of the battery:

[0153]

[0154] Among them, c b is the specific heat capacity of the battery, m b is the weight of the battery, and respectively t n and t n-1 the temperature of the coolant at all times, and respectively t n-1 The heat generation power and the total heat dissipation power at any time.

[0155] (2) According to the Bernadi heat generation rate model, the heat generation rate Q of the battery p Can be expressed as follows:

[0156] Q p =I 2 R+IT b k rev

[0157] Among them: R is the internal resistance of the battery; k rev is the entropy heat coefficient of the battery, calculated with the following formula.

[0158]

[0159] Among them, U OCV is the open circuit voltage of the battery.

[0160] Subs...