A thermal management system for a centralized power battery pack

Abstract

The invention discloses a thermal management system for a centralized power battery pack. The thermal management system comprises first and second fans, a controller and temperature sensors, wherein the temperature sensors are mounted in the battery pack, the first and second fans are mounted on a central channel located in the battery pack, and air outlets of the first and second fans are oppositely arranged in the length direction of the central channel; the controller acquires current temperature values of corresponding positions from temperature signals output by all the temperature sensors and calculates the maximum temperature difference between the current temperature values of different positions; the controller drives the first and second fans to work alternately when the maximum temperature difference is larger than a preset temperature difference threshold until the controller detects that the maximum temperature difference is smaller than or equal to the temperature difference threshold. According to the system, air circulation paths in opposite directions are formed in different periods in such a manner that the two fans work alternately, so that the fusion rate and the thermal conduction efficiency of air in the battery pack can be increased, and the thermal balance of the battery pack can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle battery management, in particular to a heat management system for a centralized power battery pack. Background technique [0002] The battery management system is the core component of electric vehicles. It is mainly used to monitor the battery cell voltage of the power battery pack, the total voltage of the power battery pack and the total current of the power battery pack, to receive and process the man-machine interface signal, and to carry out The thermal management of the power battery pack is used for energy switching according to the working conditions of the whole vehicle, and for monitoring the resistance value of the insulation resistance between the power battery pack and the vehicle body. Among them, the thermal management of the power battery pack is mainly to perform preheating treatment when the temperature of the battery cells in the power battery pack is lower than the se...

AI Technical Summary

Problems solved by technology

The main defects of the thermal management system of this split type power battery pack are: 1. Due to the limitation of mechanical structure design, it is difficult to make each power battery pack The heat in the unit is fully fused, so it is difficult to obtain the expected thermal balance effect; 2. There is no fan fault detection structure, and the fan is packaged inside the power battery pack unit, so if the fan has a fault such as stalled , it is difficult for users to find and deal with it in time; if the fan is not working properly for a long time, it will lead to a decline in the overall performance of the power battery pack, which will seriously affect the service life of the power battery pack

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