This invention belongs to the field of fuel
cell thermal management technology, and particularly relates to a battery cooling
system and its control method based on a microtube bundle
heat exchanger and countercurrent collision jet atomization. The
system includes: a fuel
cell stack, a microtube bundle
heat exchanger connected to the fuel
cell stack via a
coolant circulation loop, a
cathode drainage
recovery unit, and a countercurrent collision jet atomization unit comprising a fan and an atomizing spray module. The fan, atomizing spray module, and microtube bundle
heat exchanger are arranged sequentially. The
airflow direction generated by the fan rotation and the direction of the water mist sprayed by the atomizing spray module are opposite to each other, so that the water mist sprayed by the atomizing spray module initially moves towards the direction of the fan. After its speed decreases to zero, it is driven by the
airflow generated by the fan to move in the opposite direction and flows through the gaps within the microtube bundle heat exchanger, serving as shell-side fluid to cool the tube-side fluid within the microtube bundle heat exchanger.