Battery pack liquid cooling control method and device

Abstract

The invention provides a battery pack liquid cooling control method and device. The method comprises the steps carrying out analysis and comparison on a plurality of collected battery pack working temperature values to obtain the highest temperature value of the battery pack, calculating the temperature rise rate of the battery pack, and carrying out analysis and comparison on the temperature riserate of the battery pack to obtain the maximum temperature rise rate of the battery pack; setting a battery pack inlet water temperature target value according to the difference between the battery pack maximum temperature value and a battery pack target temperature value; sending a battery pack cooling request, the battery pack inlet water temperature target value and a water pump rotating speedpreset value to an air conditioning system when the highest temperature value of the battery pack is greater than a cooling starting threshold value; and controlling the partial components of the airconditioning system and a battery pack liquid cooling unit to be started by the air conditioning system according to the battery pack cooling request so as to start battery pack cooling. According tothe invention, the method can effectively control the temperature of a battery pack, ensures that the temperature of the battery pack is basically constant, and prolongs the service life of the battery pack; and the rotating speed of a water pump is adjusted according to the maximum temperature rise rate of the battery pack, so that energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a method and device for controlling liquid cooling of a battery pack. Background technique [0002] Electric vehicles have become the mainstream of new vehicles around the world, and the power source of electric vehicles is battery packs. The battery pack provides driving force for the vehicle, and its performance greatly affects the performance of the vehicle. Car battery packs must work within a certain temperature range in order to perform optimally. Working outside the temperature range will not only affect the discharge performance of the battery pack, shorten the life of the battery pack, but also reduce the safety factor of the battery pack. Therefore, the temperature control of the vehicle battery pack becomes an important issue. [0003] At present, the existing technology generally adopts two methods of heat dissipation for vehicle battery packs: air cooling and liquid coo...

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to propose a control method for battery pack liquid cooling to solve the problem that the battery pack inlet water temperature and water pump speed are set to constant values ​​in the prior art battery pack liquid cooling process, which cannot meet the requirements of the battery pack liquid cooling process for water cooling temperature. The different needs of the battery pack lead to large temperature fluctuations in the cooling process of the battery pack, which affects the service life of the battery pack

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