Power battery thermal management simulation method, device and storage medium

Abstract

The invention discloses a power battery thermal management simulation method, a device and a storage medium. The method comprises the steps: obtaining the convective heat transfer coefficient and fluid side temperature of the surface of a battery pack shell under a preset working condition according to a pre-established vehicle front-end module simulation model; according to a formula P = I2*R*F, calculating the heat generation power of the battery cell of the battery pack under the preset working condition; wherein I represents the charging / discharging current of the battery cell, R represents the direct-current internal resistance of the battery cell, and F represents a heat generation power correction factor; performing parameter setting on a pre-established battery pack simulation model according to the convective heat transfer coefficient, the fluid side temperature and the heat generation power; and performing simulation according to the battery pack simulation model after parameter setting, obtaining and outputting a temperature value of the temperature monitoring point. According to the technical scheme, detailed and accurate battery cell electrochemical parameters do not need to be obtained, the heat generation power of the power battery can be accurately calculated, the non-uniformity of heat exchange on the surface of a battery pack shell in the driving process can be reflected, and the temperature of a temperature monitoring point can be accurately predicted.

Description

technical field [0001] The present invention relates to the technical field of power batteries, in particular to a power battery thermal management simulation method, device and computer-readable storage medium. Background technique [0002] As one of the core components of new energy electric vehicles, the safety performance of the power battery is very important. The battery will generate a lot of heat during charging and discharging. If the heat is not properly controlled, it will easily affect the power battery pack. The cycle life of the power battery will be long, and the vehicle fire will be caused by thermal runaway. Therefore, effective thermal management of the power battery is of great significance to solve the safety problem of the power battery, and the thermal management performance will affect the performance, life and durability of the vehicle. sex. [0003] The heat generation power of the power battery is an important input parameter in the battery thermal...

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Problems solved by technology

[0003] The heat generation power of the power battery is an important input parameter in the battery thermal management. Accurate parameter input can accurately predict the heat generation of the battery under specific working conditions, so that the heat generation of the battery during use can be avoided at the initial stage of product design. In the case of overheating, the existing technology usually uses the electrochemical-thermal coupling model or Joule's law to calculate the heat generation power of the battery cell. Among them, using the electrochemical-thermal coupling model to calculate the heat generation power of the battery cell requires detailed and accurate electrical Cell electrochemical parameters, most OEMs or battery PACK integrators are often unable to obtain cell electrochemical parameters from cell suppliers, so it is not applicable to most OEMs or battery PACK integrators; use Joule's law to calculate the battery cell Heat generation power is a method widely used in engineering applications at present. However, what Joule’s law calculates is only the Joule heat of the battery cell, and does not consider the reaction heat of the battery, which leads to inaccurate calculation results of heat generation power.

[0004] In addition, the goal of battery thermal management is to control the battery temperature within a suitable temperature range. Through thermal management simulation, the temperature performance of the power battery under different working conditions can be predicted, so that the reasonable arrangement of the temperature sensor NTC and the structural optimization of thermal management can be carried out. However, in the process of implementing the simulation method provided by the prior art, since the heat exchange conditions between the battery pack shell and the external environment affect the temperature change and temperature distribution inside the battery pack, heat exchange conditions need to be processed, for example, according to the adiabatic boundary Processing, ignoring the heat exchange between the shell and the external environment, or setting a uniform heat transfer coefficient, this treatment fails to consider the actual heat exchange between the shell and the external environment, because the battery pack shell The heat transfer coefficient is non-uniform; and in the simulation process, directly monitor the maximum temperature and minimum temperature of all cells, or directly select the maximum temperature and minimum temperature of the section temperature in the height direction of the battery as the simulation result for output, which cannot reflect the BMS monitoring The temperature at the temperature monitoring point, that is, the temperature at the point where the temperature sensor NTC is arranged

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