Power battery liquid heating system based on liquid cooling system and control method of power battery liquid heating system

Abstract

The invention discloses a power battery liquid heating system based on a liquid cooling system and a control method of the power battery liquid heating system. The power battery liquid heating systemcomprises an engine (1), a thermostat (2), a radiator (3), a fan (4), a water tank (5), a first water pump (7), a heat exchanger (9), a first solenoid valve (10), a second water pump (11), a battery pack (13), a second solenoid valve (15), a third solenoid valve (16) and a heater (17), wherein the engine, the first solenoid valve, the heat exchanger and the first water pump are connected to form an engine hot water loop; the engine, the thermostat, the radiator, the water tank and the first water pump are in communication to form the engine cooling loop; the fan is arranged on the radiator; the third solenoid valve, the heater, the second water pump and the battery pack are connected to form a battery pack first liquid heating loop; the second water pump, the battery pack, the second solenoid valve and the heat exchanger are connected to form a battery pack second liquid heating loop; and the whole vehicle controller controls each loop. The power battery liquid heating system utilizedwaste heat of the engine for heating the battery pack, so that the battery quickly charges and discharges at a great multiplying rate at a low temperature.

Description

technical field [0001] The invention relates to the heat management technology of a power battery of a new energy vehicle, in particular to a liquid heat system of a power battery based on a liquid cooling system and a control method thereof. Background technique [0002] The performance and life of the battery pack largely depend on the influence of the ambient temperature, especially at low temperatures, the battery cannot normally charge and discharge at a high rate, coupled with the limitations of the hybrid engine, the power performance of the vehicle is seriously affected . In addition, due to the difference in temperature between the north and the south, especially in the north in winter, the temperature is often very low, the lowest can reach about -40°C, which often causes the power battery to not work normally and cannot be charged directly. Therefore, it is necessary to preheat the power battery at this time. [0003] The poor charge and discharge performance of ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a power battery liquid heating system based on a liquid cooling system and its control method, which comprehensively utilizes the residual heat of the hot water of the hybrid vehicle engine to quickly heat the battery pack, and uses the heater to quickly heat the battery pack, effectively solving the problem of The problem that the battery cannot be charged and discharged quickly and at a high rate at low temperature

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