A simulation analysis method and system for determining the power density of a heating device

Abstract

The invention relates to a simulation analysis method and a simulation analysis system for determining the power density of heating devices. The simulation analysis method includes mounting preset quantities of heating devices in various preset regions of power battery packs; placing the power battery packs in test environments, allowing the power battery packs to work in the test environments under the control and applying corresponding initial constant-voltage source voltages to the heating devices in the different preset regions by the aid of constant-voltage sources; adjusting the constant-voltage source voltages applied to the various preset regions according to internal temperature rise and temperature difference conditions of the power battery packs until preset requirements are met by the internal temperature rise and temperature difference conditions of the power battery packs; determining that the power density corresponding to the constant-voltage source voltages applied to the various preset regions when the preset requirements are met is power density design values of the various preset regions. According to the scheme, the simulation analysis method and the simulation analysis system have the advantages that arrangement schemes for heating plates of battery systems and the power density of the heating plates can be quickly determined, and the problems of long thermal simulation analysis time and analysis results which deviate from true states can be solved.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a simulation analysis method and system for determining the power density of a heating device. Background technique [0002] In recent years, new energy vehicles have gradually entered public households. At present, limited by power battery technology, electric vehicles generally have the problems of being difficult to charge in winter or charging for a long time, and the mileage of a single charge is shortened. In order to improve this problem, most new energy vehicle power battery systems are designed with a heating function to ensure battery performance and improve customer driving experience in winter. [0003] Heating design is an important part of the design of the power battery system. Generally, the heating plate is installed in the electric box or the module to realize the rapid increase of the battery temperature at low temperature. During the charging or drivi...

AI Technical Summary

Problems solved by technology

[0005] 1) The power battery itself is an electrochemical system with a complex structure, limited by the richness of model parameters and the complexity of building models and grids. The physical parameters such as various material densities, specific heats, and thermal conductivity coefficients are averaged, and the thermal simulation calculation results based on this simplified system model cannot simulate the internal thermal field characteristics of the battery system well.

[0006] 2) Thermal simulation analysis is to simulate the flow field through a large number of complex calculations, which requires specialized software (such as ANSYS, ADINA, ABAQUS, STAR-CCM, etc.) and computer equipment with excellent performance, as well as professional simulation analysts and resources large investment

[0007] 3) The thermal simulation analysis of the power battery system takes a long time, which increases the product development cycle and is not conducive to the competitiveness of enterprises

Images