Heating system of power battery of pure electric automobile and control method thereof

Abstract

The invention aims to provide a heating system of a power battery of a pure electric automobile and a control method thereof, which are used for eliminating the influence of low temperature on the performance of the power battery of the pure electric automobile to ensure that the pure electric automobile can be used in severe cold areas in winter. The heating system comprises a battery heating device which is arranged in a battery pack, wherein the battery heating device is provided with a hollow radiating fin; and the radiating fin is provided with a water inlet and a water outlet. The heating system is characterized by also comprising an auxiliary heater, wherein the auxiliary heater is connected with a fuel supply device; a heat exchanger is arranged in the auxiliary heater; the water inlet of the heat exchanger is communicated with the water outlet of an expansion water tank by a water pump and a water pipe; the water outlet of the heat exchanger is communicated with the water inlet of the radiating fin by an electric control valve; the water outlet of the radiating fine is communicated with the water inlet of the expansion water tank; the electric control valve, the auxiliaryheater and the water pump are connected with a vehicle controller and are controlled by the vehicle controller; and the vehicle controller is also connected with a battery management system.

Description

technical field [0001] The invention belongs to the technical field of pure electric vehicles, and in particular relates to a heating system for a power battery of a pure electric vehicle and a control method thereof. Background technique [0002] Experimental studies have shown that the most suitable working (charge and discharge) temperature for power lithium batteries used in pure electric vehicles is 35-45°C. When used in severe winter regions (such as temperatures below -25°C), the discharge performance and charge acceptance The capacity is greatly reduced by the influence of low temperature. For example, if the power battery pack is arranged under the floor of the compartment, even if its bottom is completely sealed by the body floor, it will not be affected by the low temperature outside. Therefore, during driving, the heat generated by the battery discharge may be less than that of the battery pack. The heat dissipation from the package to the outside causes the temp...

AI Technical Summary

Problems solved by technology

Experiments in an ideal laboratory show that it takes less than 10 minutes for the heating system to heat from -25°C to the set temperature, but the actual temperature changes in severe cold areas and the complexity of the operating conditions of electric vehicles make the heating time very likely to be long At this time, and if the heating system is used frequently, it will greatly consume the power of the battery itself, affecting the power and driving range of the vehicle

However, the battery heating technology using external heat sources is still in the exploratory stage at home and abroad.

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