Charging control method of lead-acid storage battery in hybrid electric vehicle

Abstract

The invention provides a charging control method of a lead-acid storage battery in a hybrid electric vehicle. The charging control method is characterized by arranging a temperature sensor on the lead-acid storage battery, reading and storing first end voltage U and temperature T of the lead-acid storage battery by a battery management system when the whole vehicle is in weak current, comparing the first end voltage U of the lead-acid storage battery with voltage values U1, U2, U3 and U4 corresponding to the charged status of 100 percent, 70 percent, 40 percent and 10 percent of the lead-acid storage battery under the temperature T, charging as required until a driver presses a power supplying button, switching off all high voltages except the battery management system and DC(Direct Current) / DC of the whole vehicle at the moment, and setting the output voltage of the DC / DC to be 0; reading and storing second end voltage U' of the lead-acid storage battery by the battery management system, comparing the second end voltage U' of the lead-acid storage battery with the voltage values U1, U2, U3 and U4 corresponding to the charged status of 100 percent, 70 percent, 40 percent and 10 percent of the lead-acid storage battery under the temperature T, and charging as required until the whole vehicle is completely powered. According to the charging control method provided by the invention, the service life of the storage battery can be effectively prolonged.

Description

technical field [0001] The invention relates to a charging control method, in particular to a charging control method for a lead-acid storage battery in a hybrid electric vehicle. Background technique [0002] With the development of the automobile industry and the deepening of people's awareness of environmental protection, new energy vehicles will surely become the mainstream of the market. Compared with traditional vehicles, new energy vehicles have added hardware such as vehicle controllers and DC / DC, which provide certain conditions for the charge and discharge management of the low-voltage auxiliary power supply system. [0003] In the low-voltage auxiliary power supply system of hybrid electric vehicles, the engine is connected to the permanent magnet generator through the planetary gearbox, and electricity can be generated through it, so the small generator connected to the engine in the traditional vehicle is canceled; the DC to DC inverter DC in the system The inp...

AI Technical Summary

Problems solved by technology

However, due to the limitation of traditional car hardware, few people have studied the charge and discharge management of lead-acid batteries in cars

In the prior art, the charging method of the lead-acid battery has the following disadvantages: 1) Most traditional vehicles basically adopt a constant voltage charging strategy, and the charging voltage is generally set between 14 and 14.5V. When the battery feeds power, the initial The charging current will be very large, which will damage the battery, and its charging rate and efficiency are limited to a certain extent; 2) There is no voltage compensation strategy for temperature, and the same voltage is used to charge when the temperature is very high and very low, which will cause In the case of overcharging or insufficient charging; 3) Under weak current conditions, the battery power is rarely monitored and prompted, and the power may be unintentionally discharged, resulting in the failure to start the car next time, and at the same time causing great damage to the battery; 4) When When the battery is full, it still provides a higher voltage for charging, which may cause overcharging

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