US 12,412,909 B2
Cooling system
Kentaro Fukuda, Kariya (JP); Ryosuke Yamada, Kariya (JP); Shunjiro Kikawa, Kariya (JP); Hisashi Higashi, Hino (JP); Hiroya Kawasaki, Hino (JP); Masahiro Kimura, Hino (JP); and Ryuya Takahashi, Toyota (JP)
Assigned to DENSO CORPORATION, Kariya (JP); HINO MOTORS, LTD., Tokyo (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by DENSO CORPORATION, Kariya (JP); HINO MOTORS, LTD., Hino (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jul. 5, 2022, as Appl. No. 17/857,530.
Claims priority of application No. 2021-112961 (JP), filed on Jul. 7, 2021.
Prior Publication US 2023/0011420 A1, Jan. 12, 2023
Int. Cl. H01M 8/04029 (2016.01); H01M 8/04007 (2016.01); H01M 8/04701 (2016.01); H01M 8/04746 (2016.01)
CPC H01M 8/04029 (2013.01) [H01M 8/04074 (2013.01); H01M 8/04723 (2013.01); H01M 8/04768 (2013.01); H01M 2250/20 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A cooling system configured to cool a fuel cell for a vehicle comprising:
a radiator configured to radiate heat of a coolant, the radiator having a radiator inlet for a coolant to flow in and a radiator outlet for a coolant to flow out;
an outlet passage connected to the radiator outlet for the coolant to flow out of the radiator outlet;
an inlet passage connected to the radiator inlet for the coolant to flow in the radiator inlet;
a branch portion provided in the outlet passage for branching into a plurality of passages for a coolant;
a confluence portion provided in the inlet passage for merging the plurality of passages into one passage;
a first passage and a second passage, as the plurality of passages, connected in parallel with each other between the branch portion and the confluence portion, a coolant flowing from the branch portion toward the confluence portion;
a fuel cell provided in the first passage, the fuel cell having a fuel cell inlet for a coolant to flow in and a fuel cell outlet for a coolant to flow out, a coolant flowing inside the fuel cell, the fuel cell generating electric power by an electrochemical reaction of fuel;
a first pump provided in the first passage to pump a coolant;
a resistor provided in the second passage for a brake, the resistor having a resistor inlet for a coolant to flow in and a resistor outlet for a coolant to flow out, a coolant flowing inside the resistor, the resistor converting an electric power generated by a motor generator into a heat energy by a braking operation to rotation of a wheel mechanically connected to the motor generator;
a second pump provided in the second passage to pump a coolant; and
a backflow preventer provided in the second passage as a mechanical component different from the second pump, so as to prevent a coolant from flowing inside the resistor in a reverse direction from the resistor outlet to the resistor inlet, wherein
the first passage has no backflow preventer, as a mechanical component different from the first pump, which prevents a coolant from flowing inside the fuel cell in a reverse direction from the fuel cell outlet to the fuel cell inlet.