Power battery thermal management system and control method therefor

Abstract

The invention provides a power battery thermal management system. By virtue of the power battery thermal management system, it is effectively ensured that a battery module can be in normal working temperature range, and the charging-discharging capability and the service life of the battery module can be improved and prolonged. The invention provides the power battery thermal management system; the power battery thermal management system comprises a battery module, a water tank, a water pump, an electric heating apparatus, a motor afterheat exchange apparatus and a vehicle-mounted air conditioner refrigerating apparatus. A control system controls the water pump and reversing valves according to the obtained temperature value of a main battery module; and by connecting or changing a backflow path of a battery coolant, heat exchange of the battery coolant and the battery module is realized.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of electric vehicles, in particular to a power battery thermal management system and a control method thereof. Background technique [0002] The battery pack is the only power source for electric vehicles. Its performance directly affects the performance of the vehicle. The temperature of the battery pack has an important impact on the performance and life of the battery. If the battery temperature is too high or too low, it will charge and discharge it. Capacity has a direct effect, reducing its useful life. [0003] Electric vehicle battery packs are composed of single cells connected in series and in parallel. If the temperature of a single cell is too high or too low, the internal resistance of each single cell will produce different heat, and the long-term uneven heat generation will further Exacerbating the temperature difference between the cells affects the charging and dis...

AI Technical Summary

Problems solved by technology

[0004] At present, research at home and abroad is mainly focused on the cooling system of the battery, such as CN102315498B, when the electric vehicle is in a low temperature state, it also affects the normal use of the battery cell, and although CN105206893A considers the heating of the battery cell, it uses PTC to directly fit the battery mold. The battery pack is heated, resulting in uneven heating of the battery cells. At the same time, the direct bonding of the battery module also has a certain problem of heat dissipation of the battery cells.

Images