Electric automobile battery pack heat management and temperature balancing control method

Abstract

The invention discloses an electric automobile battery pack heat management and temperature balancing control method. According to the electric automobile battery pack heat management and temperaturebalancing control method, a battery module, a battery box, a BMS and a warning device are provided; a heating film is arranged at the periphery of the battery module; a plurality of temperature sensors are distributed in the battery box equidistantly and a plurality of fans capable of controlling rotation angles are arranged in the battery box; and the BMS evaluates the stage of the battery by monitoring the temperature of the battery pack through the temperature sensors, and performs heat management on the battery pack by taking 0 DEG C, 33 DEG C and 53 DEG C as temperature control thresholdvalues and combining temperature increasing rate and temperature difference as judgment conditions, wherein the temperature of the battery pack is maintained within the work range by the measures of selectively heating the heating film as well as accurately controlling the rotation angle of the fans, the starting time and the cooling air quantity. By the method, too high temperature increment andtoo large temperature difference of the battery are effectively avoided, battery temperature change stability and balanced characteristics are guaranteed and the service life of the lithium battery isprolonged.

Description

technical field [0001] The invention relates to the field of electric vehicle battery packs, in particular to a method for heat management and temperature balance control of the electric vehicle battery pack. Background technique [0002] With the increasing global energy crisis and environmental pollution, the new energy vehicle industry has attracted more and more attention. Among them, electric vehicles have become the mainstream of new vehicles in the world. As the core component of electric vehicles, power batteries, especially lithium-ion batteries, are considered to be the most promising due to their high voltage, high specific energy, good cycle performance, and cleanliness. Future vehicle power source. [0003] Although lithium power batteries, the key components of electric vehicles, have some good performances, they also have defects such as poor material stability, safety problems and high cost of use. Temperature is the most important factor affecting the perf...

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Problems solved by technology

[0006] The purpose of the present invention is to be able to provide a battery pack thermal management and temperature balance control method for electric vehicles, solve the problems of low temperature protection, high temperature protection and temperature balance of the battery pack, ensure the temperature balance of the battery pack and work within the optimal temperature range, and improve consistency

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