There are many research methods for the cooling system of electric vehicles, such as experiments, simulations and theoretical calculations. This paper selects the double-inlet and double-outlet flow path liquid cooling system as the research object. analyze. Analysis of the thermal characteristics of battery modules based on the heat dissipation of the double-in and double-outlet liquid-cooling system. When using deionized water as the coolant. Since the temperature of the water pump is relatively high during operation, it is placed on the water tank to reduce the temperature of the water pump. When building a liquid-cooled test system, full consideration should be given to system leakage and overpressure, as well as the stability of the liquid inlet flow. The single-module battery pack system assembly battery standard module based on liquid cooling system heat dissipation is composed of 55Ah single cells through 1mm thick copper nickel-plated jumper 2 parallel and 12 series combination, and temperature measurement points are arranged.
The temperature measurement point of the battery standard module is arranged. The double inlet and double outlet water cooling plate is a double inlet and double outlet water cooling plate flow channel. The coolant enters from the two outside ports, flows through three side by side inlet channels, and passes through the bottom baffle. Turn back, and then flow through three side-by-side outlet channels, and then flow out from the other two outlets on the outside. Schematic diagram of the flow channel of the water-cooled plate with double inlet and double outlet flow paths. Three charge and discharge cycles. The test process is 1C100% SOC and three charge and discharge cycles. The initial state is that the battery is fully charged. The cycle process is as follows: ① Constant current discharge, current 110A, when When any cell voltage reaches 2.5V, it will cut off; ② shelving ③ Constant current and constant voltage charging, current 110A, when any cell voltage reaches 3.65V, switch to constant voltage charging, cut-off current 5.5A; ⑤cycle ①～④ three times ⑥ End of the liquid cooling system heat dissipation performance target The indicators for evaluating the heat dissipation performance of the battery pack cooling system mainly include the battery pack * high temperature rise and the maximum internal temperature difference (define the difference between the battery pack * high temperature and the ambient temperature as the battery pack * high temperature rise, battery pack * The difference between the high temperature and the lowest temperature is the maximum internal temperature difference). If the maximum temperature rise of the battery pack is smaller than the maximum internal temperature, the heat dissipation performance is superior. The design goals of the liquid cooling system are as follows: the battery pack’s *high temperature rise is less than 10°C, and the maximum internal temperature difference is less than 5°C.
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