Lithium ion battery thermal analysis method

Abstract

The invention discloses a lithium ion battery thermal analysis method comprising the steps that the HPPC electrical performance test of an electrical core is performed so as to acquire the voltage andcurrent parameters; an electrical core equivalent circuit model is established and an electrical core heating power MAP is drawn; an electrical core CFD heat radiation model is established and the heating power MAP is inputted to the CFD heat radiation model so as to acquire a lithium ion battery simulated temperature rise change curve; the charge and discharge experiment is performed on the lithium ion battery so that the actual temperature rise change curve of the lithium ion battery is acquired; and the simulated temperature rise change curve and the actual temperature rise change curve are compared. The voltage and current parameters of the electrical core are acquired by performing the HPPC electrical performance test on the electrical core, the heating power MAP of the electrical core and the simulated temperature rise change curve of the lithium ion battery are further acquired, the simulated temperature rise change curve is compared with the actual temperature rise change curve of the lithium ion battery, and the related simulation parameters are modified to correct the simulated temperature rise change curve so that the simulated temperature rise change curve is enabled to be close to the actual temperature rise change curve as much as possible. The lithium ion battery thermal analysis method is used for thermal analysis of the lithium ion charge and discharge process.

Description

Technical field [0001] The invention relates to the technical field of lithium batteries, and more specifically to a thermal analysis method for the charging and discharging process of lithium ion batteries. Background technique [0002] Among existing battery products, lithium batteries are widely used in the field of electric vehicles due to their advantages of high energy density, high output power, and long charge and discharge life. [0003] In practical applications, lithium-ion batteries will generate a lot of heat due to their own internal resistance during charging and discharging, which will cause the temperature of the lithium-ion battery to rise, and the excessively high temperature of the battery itself will easily affect the performance of the battery. Service life, even combustion and explosion will occur. [0004] Existing lithium-ion battery manufacturers lack simulation analysis of the temperature field inside the battery during the production process of the batter...

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Problems solved by technology

[0003] In practical applications, lithium-ion batteries will generate a lot of heat due to their own internal resistance during charging and discharging, which will cause the temperature of the lithium-ion battery itself to rise, and the high temperature of the battery itself will easily affect the performance of the battery. service life, even combustion and explosion

[0004] Existing lithium-ion battery manufacturers lack the simulation analysis of the temperature field inside the battery and a set of heat performance prediction schemes for the charging and discharging process of the battery in the process of manufacturing the battery, resulting in a considerable part of the internal heat management of the battery. The system did not meet the standard and had to be reworked, which affected the production progress of the manufacturer

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