| CPC H01M 8/04731 (2013.01) [G01R 31/378 (2019.01); H01M 8/04029 (2013.01); H01M 8/04074 (2013.01); H01M 8/04365 (2013.01)] | 1 Claim |
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1. A temperature control system for fuel cell, comprising:
a fuel cell under test, comprising two end plates disposed opposite each other, and the end plates having an area of at least a first preset value;
at least two temperature regulating modules, respectively disposed on a surface of one side of the two end plates facing outside of the fuel cell under test, to achieve separate temperature control of the two end plates, corresponding to separate regulation of temperature of an anode and a cathode, capable of overcoming a temperature difference between the anode and the cathode of the fuel cell under test, and an area of a heat radiation surface of the temperature regulating module opposite the end plates is greater than or equal to a first preset proportion of the first preset value;
at least two temperature detection modules, mounted to the cathode and anode of the fuel cell under test, for obtaining a measured temperature of the cathode and anode of the fuel cell under test;
a control module, connected to the temperature detection module and connected to the temperature regulating module, for respectively controlling operating states of the two temperature regulating modules according to detection results of the two temperature detection modules, so as to regulate the temperature of the end plates of the fuel cell under test, in order to regulate the measured temperature of the cathode and anode to tend to a target temperature;
the temperature regulating module comprising a plate-shaped temperature regulating unit, the plate-shaped temperature regulating unit comprising a plurality of semiconductor chilling plates;
the plate-shaped temperature regulating unit is provided opposite the end plate, and the plate-shaped temperature regulating unit has a plate-shaped heat radiation surface, an area of a heat radiation surface of the plate-shaped heat radiation surface opposite to the end plate is greater than or equal to a first preset proportion of the first preset value;
the first preset proportion is greater than or equal to 70%;
in a plurality of semiconductor chilling plates of the plate-shaped temperature regulating unit, each of the semiconductor chilling plates is uniformly arranged on a side surface of the end plate facing the outside of the fuel cell under test, and disposed close to the end plate of the fuel cell under test, an area of a heat radiation surface opposite to the end plate is greater than or equal to a second preset value, and the respective semiconductor chilling plates are connected in parallel with each other, and connected to the control module, for adjusting the temperature of one side of the end plate of the fuel cell under test according to a measured temperature acquired by the control module;
the temperature regulating module further comprises: a liquid cooling temperature control unit, arranged outside a side surface of the plate-shaped temperature regulating unit away from the fuel cell under test, and provided with a liquid path and temperature-controllable liquid that can flow in the liquid path, for adjusting the temperature of a side of the end plate of the fuel cell under test according to a measured temperature acquired by the control module;
the liquid paths of the liquid cooling temperature control units are interconnected through conduits and connected to the same temperature-controllable coolant circulator, the coolant circulator regulates the liquid temperature in the liquid path for the liquid cooling temperature control unit, and provides the temperature-controllable liquid for the liquid path, and the liquid cooling temperature control unit covers at least 80% of the area of the plate-shaped heat radiation surface of the plate-shaped temperature regulating unit;
the liquid cooling temperature control unit comprises a plurality of liquid cooling blocks, the liquid cooling block at least comprises a liquid cooling inlet and a liquid cooling outlet, and among two adjacent liquid cooling blocks, a liquid cooling outlet of a previous liquid cooling block is connected to a liquid cooling inlet of a next liquid cooling block through a conduit, the temperature-controllable liquid can flow between the respective liquid cooling blocks along the conduit;
the conduit includes a U-shaped conduit to extend the liquid path of the temperature-controllable liquid, so as to enhance an ability to control temperature;
the temperature regulating module further comprises: a thermally conductive metal plate, arranged between the plate-shaped temperature regulating unit and the liquid cooling temperature control unit, covering at least 80% of an area of the plate-shaped heat radiation surface of the plate-shaped temperature regulating unit, for accelerating a heat conduction of the semiconductor chilling plate;
the temperature regulating module further comprises: a thermally conductive film layer disposed between the thermally conductive metal plate and the plate-shaped temperature regulating unit, and/or, disposed between the thermally conductive metal plate and the liquid cooling temperature control unit;
the temperature detection module includes at least two thermocouples to be mounted to the cathode and anode of the fuel cell under test, respectively, to obtain the measured temperature of the cathode and anode;
the control module includes: a temperature controller, connected to the temperature detection module, and connected to the temperature regulating module, configured to acquire the measured temperature acquired by the temperature detection module, and respectively adjust the operation states of the two temperature regulating modules according to the magnitude relationship between the measured temperature and the target temperature, so as to adjust temperature of the cathode and the anode of the fuel cell under test to tend to the target temperature;
the first preset value is greater than or equal to 30 cm2;
a temperature control method used for the temperature control system for fuel cell, comprising:
obtaining measured temperature and target temperature of the cathode and anode of the fuel cell under test;
according to a magnitude relationship between the measured temperature and the target temperature, respectively providing an external temperature for surfaces of two oppositely arranged end plates of the fuel cell under test by the at least two temperature regulating modules, and changing an external temperature provided by the temperature regulating module for the end plates of the fuel cell under test by controlling an external temperature adjustment power of the temperature regulating module, so as to respectively adjust the temperatures of the surfaces of the two end plates, wherein when the measured temperature is greater than the target temperature, a temperature range of the external temperature is less than the measured temperature, and when the measured temperature is less than the target temperature, the temperature range of the external temperature is greater than the measured temperature;
when the at least two temperature regulating modules respectively provide the external temperature for the surfaces of two oppositely arranged end plates of the fuel cell under test, if the measured temperature changes reversely with time towards the target temperature, increasing or decreasing the external temperature adjusting power to increase or decrease the external temperature, so that the measured temperature changes positively toward the target temperature until the external temperature adjusting power reaches an extreme value within an adjustment range;
place the fuel cell under test on a fuel cell test bench, connect a reactant supply interface of the test bench with a load interface, to ensure that a gas tightness test of the fuel cell under test is qualified;
set and adjust parameters of the test bench according to a stoichiometric ratio of cathode and anode intake gas, cathode and anode intake gas temperature, cathode and anode intake gas relative humidity, cathode and anode intake gas pressure, so that an intake gas flow, intake gas temperature, intake gas humidity and intake gas pressure are within a specified parameter range;
turn on the coolant circulator and the temperature controller, set the target temperature Ttarget of the temperature controller according to operating temperature of a single fuel cell specified in a test condition, and set control temperature of the temperature-controllable liquid in the coolant circulator as Tcool, wherein, according to the operating temperature of the single fuel cell under test as 80° C., set the target temperature Ttarget of the temperature controller as 80° C., and set the control temperature Tcool of the temperature-controllable liquid in the coolant circulator as 10° C.;
start a test according to the test condition, start a performance test of the fuel cell under test, and read a real-time temperature Treal that the thermocouple inserted into the fuel cell under test feeds back to the temperature controller, including a real-time temperature Treal_1 that a first thermocouple feeds back to the temperature controller and read by the temperature controller and a real-time temperature Treal_2 that a second thermocouple feeds back to the temperature controller and read by the temperature controller;
compare the target temperature Ttarget of the temperature controller with the real-time temperature Treal of a single fuel cell, and if Ttarget is greater than Treal, automatically increase heating power of the semiconductor chilling plate by the temperature controller; compare the target temperature 80° C. of the temperature controller with the real-time temperature Treal_1 that the first thermocouple feeds back to the temperature controller, and if Treal_1 is less than 80° C., the heating power of the four semiconductor chilling plates outside the anode of the fuel cell under test is automatically increased by the temperature controller; if Treal_1 is greater than 80° C., cooling power of the four semiconductor chilling plates outside the anode of the fuel cell under test is automatically increased by the temperature controller;
compare the target temperature 80° C. of the temperature controller with the real-time temperature Treal_2 that the second thermocouple feeds back to the temperature controller, and if Treal_2 is less than 80° C., the heating power of the four semiconductor chilling plates outside the cathode of the fuel cell under test is automatically increased by the temperature controller; if Treal_2 is greater than 80° C., the cooling power of the four semiconductor chilling plates outside the cathode terminal of the fuel cell under test is automatically increased by the temperature controller;
if Treal is still greater than Ttarget when the cooling power of semiconductor chilling plate reaches the maximum, a control temperature Tcool of the temperature-controllable liquid of the coolant circulator is reduced to further increase the cooling power of the semiconductor chilling plate; if Treal_1 and Treal_2 are still greater than 80° C. under the above implementation steps, the control temperature Tcool of the temperature-controllable liquid of the coolant circulator is reduced to 5° C., thereby further enhancing the cooling power of the semiconductor chilling plate;
repeat the above steps until the difference between the target temperature of 80° C. of the temperature controller and the real-time temperature Treal_1 and Treal_2 that the thermocouple feeds back to the temperature controller do not exceed the set temperature difference value Tdiff.
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