Battery pack thermal management method and device and vehicle

Abstract

The invention relates to a battery pack heat management method and device and a vehicle. The method comprises the steps that under the condition that it is determined that the battery pack meets preset thermal management conditions, a target thermal management mode of the battery pack is determined based on a use scene of a vehicle, and the target thermal management mode is one of multiple preset thermal management modes; and performing thermal management on the battery pack according to a thermal management strategy corresponding to the target thermal management mode. Therefore, proper thermal management modes and thermal management strategies are set for different vehicle use scenes, so that the optimal thermal management strategy can be adopted to heat the battery pack in the different vehicle use scenes, normal use of the vehicle can be met, energy consumption for heating the battery can be saved, and energy waste is avoided.

Description

technical field [0001] The present disclosure relates to the field of vehicle battery thermal management, and in particular, to a battery pack thermal management method, device, and vehicle. Background technique [0002] For new energy vehicles, the energy consumption attenuation of batteries in a low temperature environment has always been a problem that needs to be solved. For example, in the low temperature environment in winter, the cruising range of some vehicles is attenuated by as much as 50%, and part of the energy consumption is inevitably used to heat the battery. This is because the suitable temperature of the battery is usually higher than the temperature value in winter. Therefore, The battery pack needs to be heated with external heat. Correspondingly, how to heat the battery pack to improve the heating energy efficiency utilization rate of the whole vehicle has always been an urgent problem to be solved. [0003] The inventor found that, in the related art, ...

AI Technical Summary

Problems solved by technology

However, heating the battery pack through waste heat does not have much impact on the battery life of the vehicle, and waste heat recovery often fails to achieve the expected battery heating effect and cannot meet the heating needs of the battery

And, when using the PTC heater to directly heat the battery pack, generally when the battery pack is lower than a certain temperature, the battery power is used to directly heat the battery pack to a fixed temperature through the PTC heater. The strategy is relatively simple, and there may be energy wasted scene

For example, when the car is used for a short time, a large amount of heat is consumed by the PTC heater to heat the battery pack. When the battery pack is heated to an appropriate temperature, the vehicle has probably reached its destination and there is no need to continue driving. After that, When the vehicle is used again, the battery pack is likely to return to the original low temperature and still needs to be reheated. In this way, the energy used to heat the battery pack will be wasted. If this happens for a long time, it will cause a lot of energy waste

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