Charging method and system for low-voltage storage battery and electric automobile

Abstract

The invention relates to a charging method and system for a low-voltage storage battery and an electric vehicle in order to achieve an effect of charging the low-voltage storage battery through a power battery when the low-voltage storage battery is in an under-voltage state. The charging method for the low-voltage storage battery comprises the following steps that a low-voltage storage battery management system carries out timing when the vehicle is in a static state and detects whether the low-voltage storage battery is in the under-voltage state or not when the timing time reaches first preset time; and if yes, the low-voltage storage battery management system sends a charging request to a keyless controller by, so that the keyless controller sends out a remote starting request to awaken a vehicle control unit in a dormant state; after the vehicle control unit is awaked, the vehicle control unit receives working parameters of the power battery, which are sent by the power battery management system awaked at low voltage and judges whether the vehicle meets a charging condition or not; and if the vehicle meets the charging condition, the vehicle control unit sends a request for controlling the power battery to carry out high-voltage electrification to the power battery management system, and sends a DCDC working request to a DCDC converter in order to charge the low-voltage storage battery.

Description

technical field [0001] The invention relates to the field of electric storage batteries, in particular to a charging method and system for a low-voltage storage battery and an automobile. Background technique [0002] As the power supply of the low-voltage system of electric vehicles, low-voltage batteries are an indispensable part of vehicles and one of the key components that affect driving safety. [0003] With the advancement of automobile intelligent technology, the intelligent equipment of the vehicle is becoming more and more complicated, resulting in a sharp increase in the number of vehicle electronic control units, so that the dark current of the vehicle gradually increases. The theoretical parking time of vehicles equipped with low-voltage batteries of the same capacity is getting shorter and shorter. If the user forgets to remove the pile head of the battery before putting the vehicle on hold, it is very easy for the battery to run out of power when the vehicle ...

AI Technical Summary

Problems solved by technology

If the user forgets to remove the pile head of the battery before putting the vehicle on hold, it is very easy for the battery to run out of power when the vehicle is used again. It causes great inconvenience, and the life of the battery will be irreversibly affected after the battery is deeply depleted, thereby increasing the user's car cost

[0004] At present, when the vehicle is put on hold, the user still needs to take the initiative to remove the battery pile head in order to prevent the battery from running out of power. On the one hand, it is easy to forget and cause the battery to feed power; on the other hand, it is not convenient enough

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