Charging method for vehicle-mounted lead-acid storage battery of HEV (hybrid electric vehicle)

Abstract

The invention provides a charging method for a vehicle-mounted lead-acid storage battery of an HEV (hybrid electric vehicle). The charging method comprises the following steps: a controller of the whole vehicle access two power supplies, one power supply is a lead-acid storage battery power supply with the nominal voltage of n*2V, and the other power supply is an ignition power supply IG, wherein n is the number of lead-acid storage battery cells connected in series in the lead-acid storage battery; the controller of the whole vehicle detects the power supply states, if the controller of the whole vehicle detects that an ignition lock is in an IG power supply state, the voltage value U of a constant electric end of the controller of the whole vehicle is measured after the IG power supply state is stable, the vehicle-mounted electric quantity of the lead-acid storage battery is determined according to the measured voltage value U and a table 1, and a DC (direct current) / DC inverter outputs different voltage to charge the lead-acid storage battery according to the vehicle-mounted electric quantity. The method is simple to operate, different voltage is used for charging according to different electric quantities of the storage battery, high intelligence is realized, the optimal work of the storage battery is guaranteed, and the service life of the storage battery can be prolonged finally.

Description

technical field [0001] The invention relates to a charging method for a vehicle-mounted storage battery, in particular to a charging method for a vehicle-mounted lead-acid battery pack of a hybrid electric vehicle. Background technique [0002] In conventional cars, the nominal voltage of the lead-acid battery used is generally 12V. When it is in a low-voltage state, the engine drives the generator to charge, and generally uses a constant voltage of about 13.8V for charging. Constantly out of service and unable to use conventional generators. Therefore, in order to solve this problem, a DC / DC inverter will be added, one end is connected to the 288V power battery power supply, and the other end outputs a rated 12V power supply to charge the low-voltage battery. The DC / DC inverter is generally integrated in the power battery pack. In, or integrated in the motor controller PEU, in order to meet the requirements of low-voltage battery charging even when the engine is not workin...

AI Technical Summary

Problems solved by technology

[0003] Since the generator in a conventional car is a power source that stabilizes the output voltage of the generator through one of the voltage stabilizing circuits, no matter what state the battery is in, it will be charged at a stable voltage, so it also brings many problems, and the light one is a waste of electric energy. In severe cases, the battery will be damaged and the service life will be shortened

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