Power battery air cooling control strategy based on vehicle-mounted navigation system

Abstract

The invention relates to a power battery air cooling control strategy based on a vehicle-mounted navigation system. The power battery air cooling control strategy specifically comprises the steps thatS1, the vehicle-mounted navigation system forecasts working condition information of a future road section; S2, the average speed and gradient of the future road section are calculated; S3, an automobile kinetic model is established by utilizing the average speed and the gradient; S4, the future required power of the power battery is calculated; S5, the future charging and discharging current ofthe power battery is calculated; S6, a future temperature rise prediction model of the power battery is established by combining heat generation and heat transfer mechanisms of the power battery; S7,the control system determines whether to start a fan or not according to the future temperature rise; S8, if the fan needs to be started, a dynamic planning algorithm determines the forced fan starting opportunity and the starting wind speed; and S9, air cooling heat dissipation treatment is conducted on the power battery according to the fan starting time and the wind speed which are obtained through dynamic planning. The invention provides a universally applicable air cooling control strategy for the power battery, and the energy consumption of the fan can be reduced as much as possible while the heat dissipation requirement of the power battery is met.

Description

Technical field: [0001] The invention relates to the technical field of thermal management of power batteries of electric vehicles; in particular, it relates to a power battery air cooling control strategy based on a vehicle navigation system. Background technique: [0002] At present, the power batteries of new energy vehicles are mostly lithium batteries, and the performance of lithium batteries is easily affected by the battery temperature. Once the temperature is too high, the capacity and cycle life of the battery will decrease, and even cause the car to burn and explode. In addition, the power battery during operation continuously undergoes charge and discharge reactions to meet the power requirements of the vehicle, thereby accumulating a large amount of heat. If the heat cannot be discharged in time, it will aggravate the accumulation of battery pack temperature. Therefore, the power battery pack during operation must be Timely and effective heat dissipation. Among...

AI Technical Summary

Problems solved by technology

However, the control strategy of relying solely on the battery temperature collected by the battery temperature sensor to determine the working state of the forced fan is prone to lagging fan heat dissipation due to the one-sidedness of the temperature collected by the temperature sensor.

Images