Hybrid car and power system and battery heating method thereof

Abstract

The invention provides a power system and a battery heating method of a hybrid car. The system comprises a battery pack, a battery heater, a battery manager, a distribution box, a motor controller, an engine, a motor and a shielded inductor. The battery heater is connected with the battery pack; the battery manager is used for controlling the battery heater to heat the battery pack at first power or second power under a condition that the hybrid car is in an electric mode or hybrid mode when the temperature of the battery pack is lower than a first heating temperature threshold and residual electric quantity is higher than a driving electric quantity threshold. The motor controller is connected with the motor and the distribution box, provided with a first input end, a second input end and a pre-charging capacitor connected between the first input end and the second input end, and used for supplying power to the motor according to a control command and voltage distributed by the distribution box. The shielded inductor matches with the pre-charging capacitor of the motor controller. The power system can realize heating, and is high in heating efficiency, low in cost and high in practicality. The invention further provides the hybrid car.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery heating method of a hybrid vehicle, a power system of the hybrid vehicle using the method, and a hybrid vehicle with the power system. Background technique [0002] With the continuous development of science and technology, new energy vehicles, especially electric vehicles and hybrid vehicles, as a means of transportation, are slowly entering every family. Users have higher and higher requirements for the performance of vehicles, especially for comfort. , which requires the vehicle to adapt to different driving needs. However, most of the electric vehicles and hybrid vehicles at this stage obviously cannot meet this requirement, especially in the cold winter, when the temperature is too low, the performance of the power battery will decline, whether it is in the discharge capacity or the battery capacity. Dropped and can't even be used. Specifically, the gen...

AI Technical Summary

Problems solved by technology

When the ambient temperature is too low, the internal battery of the electric vehicle will have the following problems: (1) At low temperature, lithium ions are easy to deposit on the negative electrode, lose electrical activity, and may even cause safety problems

Therefore, vehicles and battery packs are often used at low temperatures, which will greatly damage the life of the battery pack, and may cause safety hazards in severe cases

(2) At low temperature, when lithium-ion batteries are charged, lithium ions are easily deposited on the negative electrode and become dead lithium, and the capacity that the battery can exert is significantly reduced, and in the process of continuous use, these deposited lithium grows larger and may even Cause internal short circuit, causing safety hazard

(3) At low temperature, the discharge capacity of the battery is limited, which is not conducive to driving

Most of these schemes use external large heating equipment and power supply to heat the battery, so these schemes are only suitable for instances where the battery is fixed

Also, using an external power source to heat batteries in EVs and HEVs has limitations and is not suitable for vehicles that are not in fixed locations

Therefore, these heating technologies are not widely used in EVs and HEVs

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