Power battery water chilling unit system and intelligent control method thereof

Abstract

The invention discloses a power battery water chilling unit system and an intelligent control method thereof. The power battery water chilling unit system comprises a water chilling unit and a water chilling unit controller; the water chilling unit comprises a compressor, a pressure switch, a condenser, a condensation fan, a stored liquid drying tank, an expansion valve, a plate type exchanger, a PTC heater, a three-way valve, an inlet water temperature sensor, a power battery box body, an outlet water temperature sensor, a water tank and an electronic water pump. The compressor, the pressure switch, the condenser, the condensation fan, the stored liquid drying tank, the expansion valve and the platy type exchanger are connected in series. The power battery water chilling unit system not only efficiently improves the degree of automation of control of the power battery water chilling unit, but the control system also can adjust the rotating speed of the compressor, the electronic water pump and the condensation fan adaptively, can keep the power battery working in the optimal temperature range and the temperature difference range; in addition, the battery temperature trend can be known in advance through an ampere-hour integer; and as a correction factor is added, the hysteresis of temperature collection can be solved efficiently.

Description

technical field [0001] The invention relates to the application field of new energy vehicle power battery technology, and more specifically to a power battery water-cooling unit system and an intelligent control method thereof. Background technique [0002] During the driving process of electric vehicles, complex chemical reactions occur in the power battery during charging and discharging, and it is easy to accumulate a large amount of heat inside the battery, resulting in a rise in battery temperature, resulting in a decline in battery performance indicators such as conversion efficiency and cycle life, while traditional power batteries are cooled. The system adopts natural air cooling and water cooling, and the high-power power battery adopts water cooling scheme. [0003] In the control of traditional power battery water-cooled units, the switch method is generally used to control, and the set temperature is compared with the battery temperature. Speed ​​operation; when...

AI Technical Summary

Problems solved by technology

[0004] 1. The frequent start and stop of the compressor, electronic water pump and condensing fan can easily lead to a large temperature difference inside the battery, poor temperature balance, and the frequency conversion function of the compressor is not fully utilized, resulting in a reduction in the service life of the product, and the vehicle can run for hundreds of kilometers Increased power consumption will affect the performance of the vehicle

[0005] 2. After the water-cooling unit stops working, the water pump stops working immediately, causing the temperature of the cooling pipeline to be too low and unable to obtain circulating cooling, resulting in easy damage to the refrigeration device

Images