Dual battery pack switching circuit for electric vehicles

Abstract

The invention discloses a dual-battery-pack switching circuit used for electric vehicles. The dual-battery-pack switching circuit used for the electric vehicles comprises a first battery pack, a second battery pack and a power source output terminal which is electrically connected with the first battery pack and the second battery pack. The dual-battery-pack switching circuit used for the electric vehicles is characterized in that the first battery pack is electrically connected with an analog input terminal of a single-chip microcomputer through an ADC sampling circuit; the first battery pack is electrically connected with a power source terminal of the single-chip microcomputer through a 5V voltage stabilizing circuit; the second battery pack is electrically connected with a signal input terminal of the single-chip microcomputer through a voltage detection circuit; a fourth MOS transistor is arranged between the first battery pack and the power source output terminal; a sixth MOS transistor is arranged between the second battery pack and the power source output terminal; a signal output terminal of the single-chip microcomputer is electrically connected with the fourth MOS transistor through a drive circuit; the signal output terminal of the single-chip microcomputer is electrically connected with the sixth MOS transistor through an isolation drive circuit. Compared with a traditional manual control mode, the dual-battery-pack switching circuit used for the electric vehicles has a higher automatic switching level.

Description

technical field [0001] The invention relates to the technical field of battery control for electric vehicles, in particular to a switching circuit for double battery packs for electric vehicles. Background technique [0002] In recent years, with the rapid development of society, energy problems and environmental problems have become more and more obvious. Environmentally friendly vehicles represented by electric vehicles have attracted more and more attention. As we all know, electric vehicles use batteries as power sources. [0003] At present, battery life is one of the factors that limit the rapid development of electric vehicles. Since the battery life of electric vehicles mainly depends on their own batteries, and the capacity of batteries is limited, in order to improve the battery life of electric vehicles, two battery packs are used. There are two main control methods for traditional dual-battery electric vehicles: 1. Control the dual-battery through the switch cont...

AI Technical Summary

Problems solved by technology

[0003] At present, battery life is one of the factors that limit the rapid development of electric vehicles. Since the battery life of electric vehicles mainly depends on their own batteries, and the capacity of batteries is limited, in order to improve the battery life of electric vehicles, two battery packs are used. There are two main control methods for traditional dual-battery electric vehicles: 1. Control the dual-battery through the switch control contactor, that is, the user can turn on / off according to his own experience. Related battery packs; 2. Set the three-speed switch on the electric car lock, OFF / A / B, and realize the opening / closing of the dual battery packs through the car key during use; through practice, it is found that the above two traditional technologies exist The following defects: Since the above two control methods are all controlled by humans, switching is achieved through mechanical contacts

Due to the uncertainty of human control, it is possible to switch to another set of batteries when the battery power is slightly insufficient, resulting in waste of battery capacity; or the battery is completely discharged and the system stops operating

The contact of mechanical contacts may be damaged due to the increase of contact resistance due to the long-term switching of the contacts

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