March 9thByd Company Limited Ltd.The patent "charging and discharging device, control method and vehicle of power battery" was disclosed. The patent was applied on September 5, 2019, and the application number is CN112440818A.
At present, electric vehicles are mainly powered by power batteries, and the charge and discharge performance of power batteries is greatly affected by temperature. the charge and discharge of power batteries become significantly worse in cold environment, resulting in low charging efficiency or even unable to charge. this limits the use of electric vehicles in cold areas.
In the existing technology, in order to improve the charging efficiency of the power battery, DC PTC (positive temperature coefficient resistance) heating method is usually used to heat the power battery. However, when the DC PTC heating method is used to heat the power battery, the DC end of the OBC (vehicle Charger) on the electric vehicle is used to supply power to the PTC heater. The OBC needs to charge the power battery while supplying power to the PTC heater, which reduces the charging power of the power battery, resulting in low charging efficiency and long charging time, affecting the user experience.
According to the patent summary, the present disclosure relates to a power battery charging and discharging device, a control method and a vehicle, and relates to the technical field of an electric vehicle. The charging and discharging device comprises a vehicle charger OBC and a heater, the control terminal of the OBC is connected with the battery management system BMS of the vehicle, the DC end of the OBC is connected with the power battery of the vehicle, the AC end of the OBC is connected with the AC power source, and the AC end of the OBC is connected with the heater. The OBC is used to convert the AC voltage output of the AC power supply into DC voltage to charge the power battery, and the heater is used to heat the power battery when the temperature of the power battery is less than or equal to the preset temperature threshold.
The invention directly uses the AC power supply to power the heater, which improves the charging efficiency of the power battery and shortens the charging time without affecting the charging power of the power battery.
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