Lithium ion battery low-temperature alternating current heating device for electric bicycle

Abstract

The invention relates to a lithium ion battery low-temperature alternating current heating device for an electric bicycle. The lithium ion battery low-temperature alternating current heating device isused for performing alternating current heating on a power battery. The lithium ion battery low-temperature alternating current heating device comprises a control unit, an energy conversion circuit,an energy storage inductor, a capacitor, a pre-charging circuit and a starting switch, wherein the power battery, the energy storage inductor, the energy conversion circuit and the capacitor are sequentially connected to form a loop; the pre-charging circuit and the starting switch are parallelly connected between the power battery and the capacitor; the control unit is respectively connected withthe energy conversion circuit, the pre-charging circuit and the starting switch, and controls the on-off state of the starting switch according to the temperature information of the power battery, sothat the conversion between the alternating current heating state and the normal power supply state of the power battery can be realized; during the entering of the alternating current heating state,the control unit controls the work state of the energy conversion circuit according to the current information of the power battery in real time; the inside heating is realized in the alternating current charging and discharging process of the power battery. Compared with the prior art, the lithium ion battery low-temperature alternating current heating device has the advantages that the heatingis uniform; the efficiency is high; the newly added devices are few; the cost is low, and the like.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and relates to a low-temperature AC heating device for a lithium-ion battery used in an electric vehicle, in particular to a battery management system resource and a parallel capacitor of a vehicle-mounted drive motor inverter, and uses an AC charging device. The power battery rapid preheating device of the discharge method is suitable for preheating of electric vehicles or other lithium-ion power batteries in low temperature environments. Background technique [0002] As energy and environmental problems continue to intensify, new energy vehicles using power batteries as energy sources have become a trend in vehicle development. Among them, lithium-ion batteries have high operating voltage, high energy density, long cycle life, and fast charging speed, which have become an important development direction of energy sources for electric vehicles. At the same time, lithium-ion batteries ...

AI Technical Summary

Problems solved by technology

As a result, lithium-ion batteries have poor performance in areas with low temperatures or in seasons, which seriously restricts the wide application of lithium-ion batteries.

[0003] The existing low-temperature preheating methods for batteries are mainly external heating methods such as heating film heating and wide-line heating, which consume a lot of energy and the heating effect is not obvious

At the same time, there is also an AC heating method by means of an external charger. For example, Chinese patent CN205811017U discloses a heating device for a lithium-ion power battery pack of an electric vehicle, which uses a charger as a heating power source. However, it cannot be achieved without the support of an external charger. On-board heating with charge limitation

The above external heating methods cannot meet the efficiency, cost and weight requirements of in-vehicle applications

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