Low-temperature charge and heating system and method for power battery for all-electric vehicles

Abstract

The invention discloses a low-temperature charge and heating system and method for a power battery for all-electric vehicles. The system comprises a vehicle control unit, a vehicular charger, a battery management system, the power battery, a DC / DC converter, a heat management system, a PTC heater and a fan module. The method includes: during charging, heating is allowed only when the temperature is very low and the temperature T of the power battery is smaller than or equal to 5 DEG C; when the temperature is very low, heating and charging with low current are performed simultaneously; if the temperature T of the power battery is larger than 5 DEG C, low-temperature heating is aborted and a normal charge mode is allowed. The system and the method have the advantages that low-temperature charge and heating time can be shortened, normal charge of the power battery is guaranteed and the service life of the power battery is unaffected.

Description

technical field [0001] The invention belongs to the technical field of pure electric vehicles, and in particular relates to a low-temperature charging and heating system and heating method for power batteries of pure electric vehicles. Background technique [0002] Pure electric vehicles have many advantages such as energy saving and environmental protection, and are the product of the combination of many high and new technologies. With the reduction of energy sources and the vigorous advocacy of the government, they will surely have a broad market in the near future. [0003] Pure electric vehicles can make reasonable use of the advantages of power grid valley power. At present, my country has listed the industrialization of pure electric vehicles as a new energy vehicle industry plan. The key bottleneck affecting the industrialization of pure electric vehicles is the power battery. At present, most of the power batteries of pure electric vehicles use lithium-ion power batt...

AI Technical Summary

Problems solved by technology

This method has the following problems: (1) The heating power is small, usually lower than 2Kw, and the heating time is too long; (2) The resistance wire is added to the inside of the power battery, so the resistance wire cannot be effectively monitored, and the battery is prone to damage. package security issues

This method has the following problems: (1) The power consumption is the remaining power of the battery, not the power provided by the on-board charger, resulting in short heating time and low conversion efficiency, and when the remaining power is small, the heating effect cannot be achieved; (2) It cannot control the power of PTC, so that the control system cannot realize the heating function of small current while charging; (3) During the heating process, the control circuit disconnects the charging circuit, which increases the complexity of the system and makes the system Reduced efficiency and longer charging time

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