Temperature consistency control system and method for power battery of new-energy automobile

Abstract

The invention relates to a temperature consistency control system and method for the power battery of a new-energy automobile. The system comprises a first expansion kettle, a first water pump, a first three-way water valve, a PTC water heater, a first cooling water temperature sensor, a battery cooling plate, a second cooling water temperature sensor, a battery cooler, a second three-way water valve and the first expansion kettle, which are sequentially connected to form a battery heating/cooling water circulation circuit, wherein the battery cooling plate is arranged at a position where power battery is located; the power battery is provided with a plurality of battery temperature sensors respectively connected with battery cores inside the power battery; a branch circulation loop is arranged between the first three-way water valve and the second three-way water valve and parallelly connected with two ends of a cascaded line of the first water pump and the first expansion kettle; andthe branch circulation loop is provided with a second expansion kettle and a second water pump. Compared with the prior art, the invention has the advantage that good temperature consistency of the battery cores of the power battery of the new-energy automobile is maintained by switching the water inlet and the water outlet of a water cooling plate, so the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the thermal management technology of the whole electric vehicle, in particular to a temperature consistency control system and control method for the power battery of the new energy vehicle. Background technique [0002] The technology of electric vehicles is changing with each passing day. As the power source of electric vehicles, the power battery is an important core component of electric vehicles, so the operating status of the power battery is very important. As we all know, the battery is a product of electrochemistry, and the temperature control of the battery directly affects the operating state of the battery. If the battery temperature is too low, the activity of the battery will decrease, and the working efficiency will decrease; if the battery temperature is too high, it may affect the battery life and driving safety; if the temperature difference of the internal cells of the battery is too large, it will affect the...

AI Technical Summary

Problems solved by technology

In the process of battery cooling, the minimum temperature of the battery and the temperature difference between the batteries are ignored, which leads to the consistency and life of the battery.

Similarly, during the battery heating process, the maximum temperature of the battery cell and the temperature difference between the cells are ignored, which leads to the impact on the consistency and life of the battery cell

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