Power battery thermal management system for electric vehicle

Abstract

The invention belongs to the technical field of power battery systems for electric vehicles and in particular relates to a power battery thermal management system for an electric vehicle. The power battery thermal management system comprises a battery box, a lithium ion battery system, an air cooling system and a water cooling system, wherein the lithium ion battery system, the air cooling system and the water cooling system are installed in the battery box, the battery box is internally provided with a heat insulation device, and the heat insulation device is adhered to the inner wall of the battery box. According to the power battery thermal management system disclosed by the invention, as heat insulation is installed in the battery box as a thermal management mode of a battery system of the electric vehicle in a non-running state, and the air cooling system and the water cooling system are arranged as a thermal management mode of the battery system of the electric vehicle in a running state, the service life loss and the safety hidden dangers as the battery system of the electric vehicle is in high or low temperature environment for a long time can be reduced; the temperature in a battery pack is not too high or low when the vehicle runs, and the thermal management efficiency of the vehicle during running is also improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle power battery systems, and in particular relates to a power battery heat management system for electric vehicles. Background technique [0002] With the rapid development of electric vehicles, battery systems, as one of the core components that directly affect the performance of electric vehicles, have received more and more attention, especially lithium-ion batteries, because of their high energy density, excellent power output characteristics and Long life and other advantages are currently well used in electric vehicle battery packs. However, the performance of lithium-ion batteries is sensitive to temperature changes. In the process of use or storage, the reliability and safety performance will be affected if the temperature is too high or too low. Therefore, it is necessary to optimize the structure of the battery system and design the thermal management system of the battery pack. ...

AI Technical Summary

Problems solved by technology

However, the air-cooled or water-cooled system is mainly to manage the temperature of the battery pack during the driving of the electric vehicle, and it cannot play the role of heat insulation or heat preservation for the non-operating state of the vehicle (that is, the battery system is not working).

When the vehicle is in an extremely high temperature environment (such as parked under the scorching sun in summer) or a low temperature environment (such as placing it outdoors at night in winter), the temperature of the battery pack inside the battery box will quickly balance with the temperature of the external environment, and the battery pack is equivalent to being stored in extreme high or low temperature. In the environment, this is the case for a long time. Since the lithium-ion battery is sensitive to the environment, the battery will have side reactions at extremely high or low temperatures, which will affect the service life and safety of the entire battery system; When the initial temperature of the battery pack is balanced with the ambient temperature, enabling the thermal management system will result in excessive heat loss for heat dissipation or heating, lower efficiency, and easy battery pack damage. Continue to operate at high or low temperature, affect the performance of the battery pack, and even directly affect the use of electric vehicles due to the abnormal temperature alarm of the battery management system

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