Hybrid electric bus supercapacitor and lithium battery parallel circuit

Abstract

The invention discloses a hybrid power public transport super-capacitor and lithium battery parallel circuit which structurally comprises a super-capacitor and a lithium battery. A DC-DC converter comprising IGBT (insulated gate bipolar transistor) modules T1 and T2 and an inductor L1 is arranged between the super-capacitor and the lithium battery, one end of the inductor L1 is connected with a connecting wire of the T1 and the T2, the other end of the inductor L1 is connected with a positive electrode of the lithium battery, the T1 and the L1 form a BUCK circuit, the T2 and the L1 form a BOOST circuit, so that the super-capacitor and the lithium battery are connected in parallel, a passage of the super-capacitor is provided with a current sampling unit, and a passage of the lithium battery is similarly provided with a current sampling unit and a high-capacity energy storage capacitor which are parallelly connected to two ends of the battery. Fuel consumption of a whole vehicle is improved, the lithium battery is protected from high-current charge and discharge, the service life of the lithium battery is prolonged, fine effects can be achieved, and the parallel circuit is wide in application range.

Description

Technical field [0001] The invention relates to a parallel circuit of a hybrid power bus super capacitor and a lithium battery, which belongs to the field of automobile circuits. Background technique [0002] At present, the existing super capacitors on hybrid buses are mainly used for vehicle starting and braking energy recovery. Lithium batteries are used to drive the vehicle when the super capacitor is insufficient during the driving process, but do not participate in energy recovery. The main reason is based on lithium. The set-up time of battery charging is long and the recovery efficiency is low. Supercapacitors can realize fast charging and discharging of large currents, and there is no efficiency problem, but there is still a possibility that when the supercapacitor has enough energy, the recovery effect will fail, resulting in braking energy loss. The super capacitor and the lithium battery are connected in parallel through a two-way DC-DC, and the energy can be exchang...

AI Technical Summary

Problems solved by technology

[0002] At present, the supercapacitor on the existing hybrid electric bus is mainly used for starting and braking energy recovery of the whole vehicle. The lithium battery participates in the driving of the whole vehicle when the supercapacitor is insufficient in the driving process, but does not participate in energy recovery. The main reason is that it is based on lithium Battery charge build-up time is long, recycling efficiency is low

Supercapacitors can realize fast charging and fast discharging of large currents, and there is no problem of efficiency, but there is still a possibility that when the energy of the supercapacitor is sufficient, the recovery function will fail, resulting in loss of braking energy

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