Cooling liquid pump assembly for power battery thermal management system and control method thereof

Abstract

The present invention provides a cooling liquid pump assembly for a thermal management system of a power battery and a control method thereof. The cooling liquid pump assembly for a thermal management system of a power battery includes a liquid pump and a heater. The cooler heats the coolant and discharges it. The control method of the coolant pump assembly for the thermal management system of the power battery includes the following steps: S1: cyclically detect the output current of the liquid pump through a period of time; S2: compare the output current with a preset current, and the The preset current is the output current of the liquid pump in the state of gas-liquid mixing; when the output current is greater than the preset current, return to step S1; when the output current is less than or equal to the preset current and lasts for a After the preset time, go to step S3; S3: stop heating the coolant. The invention recognizes the gas-liquid mixing state of the liquid pump by detecting the output current of the liquid pump, stops the heater in time, and effectively and reliably prevents the heater from dry burning.

Description

technical field [0001] The invention relates to the technical field of electric vehicle battery thermal management, in particular to a cooling liquid pump assembly for a power battery thermal management system and a control method thereof, and the IPC classification belongs to G01R19 / 165. Background technique [0002] The thermal management system of the electric vehicle uses the liquid pump to provide the circulating flow power of the medium in the cooling liquid circulation pipeline, and also uses the heating device to start when the battery needs to be heated to increase the temperature of the cooling liquid. The existing thermal management system mainly detects the temperature of the liquid at the water outlet of the heating device, so as to judge whether the working condition of the heating device is abnormal. However, the limitation of this method is that there is a hysteresis in the temperature feedback of the water outlet. When the temperature of the water outlet is...

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Problems solved by technology

But the limitation of this method is that there is hysteresis in the temperature feedback of the water outlet

When the temperature of the water outlet is abnormal, the heating device may have been burned. At this time, even if protective measures are taken immediately, the heating device cannot be effectively protected.

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