CN111725547A - Liquid cooling system for fuel cell - Google Patents
Liquid cooling system for fuel cell Download PDFInfo
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- CN111725547A CN111725547A CN201910215378.6A CN201910215378A CN111725547A CN 111725547 A CN111725547 A CN 111725547A CN 201910215378 A CN201910215378 A CN 201910215378A CN 111725547 A CN111725547 A CN 111725547A
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- cooling system
- fuel cell
- liquid cooling
- hydraulic pressure
- speed
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04768—Pressure; Flow of the coolant
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04029—Heat exchange using liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
- H01M8/04074—Heat exchange unit structures specially adapted for fuel cell
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04417—Pressure; Ambient pressure; Flow of the coolant
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04664—Failure or abnormal function
- H01M8/04686—Failure or abnormal function of auxiliary devices, e.g. batteries, capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention provides a liquid cooling system for a fuel cell, wherein the liquid cooling system can detect whether bubbles exist in a cooling pipeline of the fuel cell before the fuel cell operates, and eliminate the bubbles when the bubbles exist in the cooling pipeline.
Description
Technical Field
The present invention relates to a fuel cell, and more particularly, to a liquid cooling system for a fuel cell, wherein the liquid cooling system for a fuel cell of the present invention is capable of detecting whether or not bubbles exist in a cooling line of the fuel cell before the fuel cell is operated, and removing the bubbles when the bubbles exist in the cooling line. The invention further relates to a bubble elimination method for the liquid cooling system of the fuel cell.
Background
Fuel cells, particularly proton membrane exchange fuel cells (or hydrogen fuel cells), can convert chemical energy directly into electrical energy without a heat engine process, and thus have the advantages of high energy conversion efficiency, low noise, low pollution, long service life, and the like, and are increasingly receiving attention. However, in actual operation, part of the chemical energy of the fuel is converted into heat by the fuel cell. In the fuel cell, heat includes electrochemical reaction heat, resistance heat, phase change heat, and the like, depending on the manner of generation thereof. Without effective thermal management of the fuel cells, as the fuel cells continue to operate and electrochemical reactions continue to occur, heat will build up within the fuel cell stack, eventually leading to excessive temperatures in the flow field plates of the fuel cells and even the entire fuel cell stack. The excessive temperature of the flow field plate of the fuel cell may cause the electrochemical reaction speed and output power of the fuel cell to be rapidly reduced, and even cause safety accidents. Therefore, a good thermal management system is indispensable for enabling the fuel cell to operate continuously with high efficiency.
The core of the thermal management of the fuel cell is that when the fuel cell runs, a cooling system is used for carrying out heat dissipation treatment on the fuel cell. Fuel cells can be classified into air-cooled fuel cells (in which a heat transfer medium or a cooling medium is a gas such as air) and liquid-cooled fuel cells (in which a heat transfer medium or a cooling medium is a liquid such as water or an aqueous solution) according to the cooling medium of a cooling system. For fuel cells with lower output, air cooling is used to meet the cooling requirements of the cell. For higher output fuel cells, cooling with a liquid, such as water or an aqueous solution, is required. A fuel cell liquid cooling system generally includes a fluid pump, cooling channels disposed between flow field plates of the fuel cell, fluid conduits communicating with a heat transfer medium inlet and a heat transfer medium outlet of the cooling channels, respectively, wherein a heat transfer medium (e.g., water, or other heat transfer medium) flowing in the cooling channels and fluid conduits transfers heat generated by the flow field plates of the fuel cell to the heat sink so that it is dissipated therefrom by air or gas flow, and a heat exchanger (or heat sink) connected to the fluid conduits, the fluid pump maintaining and/or accelerating the flow of the heat transfer medium in the cooling channels, fluid conduits, and/or heat sink.
During operation, the liquid cooling system of the fuel cell generates bubbles. The bubbles have poor heat transfer properties and are easily attached to the inner wall of the cooling passage. Therefore, when bubbles exist in the liquid cooling system of the fuel cell, especially in the cooling channel of the liquid cooling system of the fuel cell, local heat dissipation of the fuel cell may be poor and local overheating may occur, which may affect the normal operation of the fuel cell.
Disclosure of Invention
The main advantage of the present invention is that it provides a liquid cooling system for a fuel cell, which can automatically detect the fuel cell, especially automatically detect whether there is air bubble in the cooling pipeline before the fuel cell runs to generate power, which can affect the normal operation of the fuel cell or harm the fuel cell.
Another advantage of the present invention is that it provides a liquid cooling system for a fuel cell, wherein the liquid cooling system for a fuel cell of the present invention has a fast detection speed of air bubbles, a high accuracy of detection results, and an easy implementation.
Another advantage of the present invention is that it provides a liquid cooling system for a fuel cell that automatically eliminates or removes air bubbles in its cooling line upon detecting the presence of air bubbles in the cooling line that may affect the normal operation of the fuel cell or harm the fuel cell.
Another advantage of the present invention is that it provides a liquid cooling system for a fuel cell that eliminates air bubbles in the cooling line that may affect the normal operation of the fuel cell or harm the fuel cell without affecting the operation of the fuel cell.
Another advantage of the present invention is that it provides a liquid cooling system for a fuel cell that does not require a complex and precise structure.
Another advantage of the present invention is that it provides a liquid cooling system for a fuel cell that can be used with existing liquid cooled fuel cells with only minor modifications to the existing fuel cells.
Another advantage of the present invention is that it provides a bubble removing method for a liquid cooling system of a fuel cell, wherein the bubble removing method for a liquid cooling system of a fuel cell of the present invention can automatically remove or eliminate bubbles in a cooling pipe of the liquid cooling system of a fuel cell when the bubbles exist in the cooling pipe.
Additional advantages and features of the invention will be set forth in the detailed description which follows and in part will be apparent from the description, or may be learned by practice of the invention as set forth hereinafter.
In accordance with the present invention, the foregoing and other objects and advantages are realized in accordance with the liquid cooling system for a fuel cell of the present invention, comprising:
a control module;
at least one first fluid tube;
at least one second fluid tube;
at least one hydraulic pressure sensor;
at least one cooling channel adapted to be disposed between flow field plates of the fuel cell;
the radiator is provided with a heat dissipation cavity, a liquid outlet and a liquid inlet, wherein the liquid outlet and the liquid inlet are respectively communicated with the heat dissipation cavity; and
at least one fluid pump, wherein the first fluid pipe is respectively communicated with the liquid outlet of the radiator and one end of the cooling channel, the second fluid pipe is respectively communicated with the liquid inlet of the radiator and the other end of the cooling channel, such that the cooling channel, the heat dissipation chamber of the heat sink, the first fluid tube and the second fluid tube form a cooling circuit, wherein the fluid pump is arranged in the cooling pipeline to drive the heat transfer medium to circulate in the cooling pipeline, wherein the hydraulic pressure sensor is provided in the cooling line to detect a hydraulic pressure in the cooling line, wherein the control module is electrically connected with the fluid pump to control the fluid pump to drive the heat transfer medium to flow in the cooling pipeline, the hydraulic sensor is electrically connectable to the control module such that the control module can receive hydraulic data generated by the hydraulic sensor.
Further, the liquid cooling system for a fuel cell of the present invention includes at least one flow rate sensor, wherein the flow rate sensor is disposed in the cooling line to detect a flow rate of the heat transfer medium in the cooling line, and wherein the flow rate sensor is electrically connected to the control module to transmit flow rate data generated by the flow rate sensor to the control module.
According to another aspect of the present invention, the present invention further provides a bubble elimination method for a liquid cooling system of a fuel cell, comprising the steps of:
(A) controlling a fluid pump of the liquid cooling system of the fuel cell to rotate at a first calibrated rotating speed so as to drive a heat transfer medium to flow in a cooling pipeline of the liquid cooling system of the fuel cell; and
(B) and detecting the first hydraulic pressure P1 in the cooling pipeline of the liquid cooling system of the fuel cell when the fluid pump of the liquid cooling system of the fuel cell rotates at the first calibrated rotating speed in real time.
Further, the bubble eliminating method for the liquid cooling system of the fuel cell comprises the following steps:
(C) and if the first hydraulic pressure P1 is smaller than a first calibrated hydraulic pressure value, controlling the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude.
Further objects and purposes of the present invention will become more fully apparent from the ensuing description and the accompanying drawings.
These and other objects, features and objects of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the appended claims.
Drawings
Fig. 1 is a schematic structural diagram of the liquid cooling system of the fuel cell according to the embodiment of the invention.
Fig. 2 shows the cooling circuit of the liquid cooling system of the fuel cell according to the embodiment of the invention.
Fig. 3A shows an alternative implementation of the liquid cooling system for a fuel cell according to an embodiment of the invention.
Fig. 3B is a simplified flowchart of the bubble elimination method for the liquid cooling system of the fuel cell according to the embodiment of the present invention.
Fig. 4 shows a detection result of the first hydraulic pressure in the cooling line of the liquid cooling system for the fuel cell according to the embodiment of the invention, wherein the first hydraulic pressure is always kept smaller than the first calibrated hydraulic pressure value in the continuous time T2.
Fig. 5 shows another detection result of the first hydraulic pressure in the cooling circuit of the liquid cooling system for a fuel cell according to the embodiment of the invention, wherein the total duration of the first hydraulic pressure not less than a first calibrated hydraulic pressure value within the continuous time T2 is less than the time T1.
Fig. 6 shows another detection result of the first hydraulic pressure in the cooling line of the liquid cooling system for the fuel cell according to the embodiment of the invention, wherein the first hydraulic pressure is always greater than the first calibrated hydraulic pressure value in the continuous time T1.
Fig. 7 shows a detection result of the second hydraulic pressure in the cooling line of the liquid cooling system for the fuel cell according to the embodiment of the invention, wherein the second hydraulic pressure is always kept smaller than the second calibrated hydraulic pressure value in the continuous time T2.
Fig. 8 shows another detection result of the second hydraulic pressure in the cooling circuit of the liquid cooling system for a fuel cell according to the embodiment of the invention, wherein the second hydraulic pressure is not less than a second calibrated hydraulic pressure value for a total duration less than a time T1 within a continuous time T2.
Fig. 9 shows another detection result of the second hydraulic pressure in the cooling line of the liquid cooling system for a fuel cell according to the embodiment of the invention, wherein the second hydraulic pressure is always greater than the second calibrated hydraulic pressure value during the continuous time T1.
Fig. 10 is a flowchart illustrating a bubble elimination method for a liquid cooling system of a fuel cell according to an embodiment of the present invention.
Fig. 11 is a flowchart illustrating another bubble elimination method for a liquid cooling system of a fuel cell according to an embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Referring to fig. 1 and 2 of the drawings, a liquid cooling system for a fuel cell according to an embodiment of the present invention is illustrated, wherein the liquid cooling system for a fuel cell of the present invention comprises at least one cooling channel 10 disposed between flow field plates of the fuel cell, at least one first fluid pipe 20, at least one second fluid pipe 30, at least one hydraulic sensor 40, at least one heat sink 50, a control module 60, and at least one fluid pump 70, wherein the heat sink 50 has a heat dissipation chamber 501, a liquid outlet 502, and a liquid inlet 503, wherein the liquid outlet 502 and the liquid inlet 503 of the heat sink 50 are respectively communicated with the heat dissipation chamber 501, wherein the cooling channel 10 is disposed to allow a heat transfer medium to flow therethrough and to remove heat from the interior of the fuel cell, the first fluid pipe 20 is respectively communicated with the liquid outlet 502 of the heat sink 50 and one end of the cooling channel 10, the second fluid pipe 30 is respectively communicated with the liquid inlet 30 of the radiator 50 and the other end of the cooling channel 10, so that the cooling channel 10, the heat dissipation cavity 501 of the radiator 50, the first fluid pipe 20 and the second fluid pipe 30 form a cooling circuit 100, wherein the cooling circuit 100 is configured to allow a cooling liquid to circulate in the cooling circuit 100, the fluid pump 70 is configured in the cooling circuit 100 to drive a heat transfer medium to flow in the cooling circuit 100, the hydraulic pressure sensor 40 is configured in the cooling circuit 100 to detect a hydraulic pressure (of the heat transfer medium) in the cooling circuit 100, wherein the control module 60 is electrically connected with the fluid pump 70 to control the fluid pump 70 to drive the heat transfer medium to flow in the cooling circuit 100, and the hydraulic pressure sensor 40 is electrically connected with the control module 60 to electrically connect the hydraulic pressure of the heat transfer medium in the cooling circuit 100 detected by the hydraulic pressure sensor 40 as electronic data Is transmitted to the control module 60. Accordingly, the hydraulic pressure sensor 40 of the fuel cell liquid cooling system of the present invention is configured to detect the hydraulic pressure of the heat transfer medium in the cooling line 100 of the fuel cell liquid cooling system in real time and generate corresponding hydraulic pressure data or hydraulic pressure electronic data, and the control module 60 is configured to receive the hydraulic pressure electronic data. It will be appreciated that the control module 60 may control the rotational speed of the fluid pump by controlling the power provided to the fluid pump 70. Preferably, the fluid pump 70 is an electric fluid pump. Alternatively, the fluid pump 70 may be another type of fluid pump, and the control module 60 may control the rotational speed of the fluid pump by controlling the power provided to the fluid pump 70. For example, the fluid pump 70 is an internal combustion engine-driven fluid pump, and the control module 60 controls the speed of the fluid pump 70 by controlling the power output of the internal combustion engine. It will be understood by those skilled in the art that the heat transfer medium herein refers to a liquid heat transfer medium such as water, an aqueous solution or other transfer medium that is liquid at ordinary temperatures. Preferably, the fluid pump 70 is disposed downstream of the heat sink 50 to create a negative pressure and drive the flow of heat transfer medium between the heat sink 50 and the fluid pump 70. Optionally, the fluid pump 70 is disposed upstream of the radiator 50.
As shown in fig. 1 to 9 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention is further configured to control the fluid pump 70 of the liquid cooling system of the fuel cell to rotate at a first calibrated speed so as to drive the heat transfer medium to circulate in the cooling pipe 100 of the liquid cooling system of the fuel cell. Meanwhile, the control module 60 is further configured to control the hydraulic sensor 40 to detect the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell in real time when the fluid pump 70 rotates at the first calibrated speed. As shown in fig. 4 to 6 of the drawings, when the fluid pump 70 rotates at the first calibrated speed, the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell detected by the hydraulic sensor 40 in real time may be always maintained, or always maintained to be greater than a first calibrated hydraulic pressure value for a certain period of time, or always be less than a first calibrated hydraulic pressure value, or be in a fluctuating state with a large or small time for a certain period of time.
As shown in fig. 4 and 5 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention is further configured to control the fluid pump 70 of the liquid cooling system of the fuel cell to alternately rotate at a first speed and a second speed when the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell detected by the hydraulic pressure sensor 40 in real time is less than a first predetermined hydraulic pressure value. It is understood that the first rotational speed and the second rotational speed of the fluid pump 70 are different in magnitude. In other words, when the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell detected by the hydraulic sensor 40 in real time is smaller than a first calibrated hydraulic pressure value, the control module 60 is configured to consider that there are air bubbles in the cooling line 100 of the liquid cooling system of the fuel cell that may affect the normal operation of the fuel cell, and at this time, the control module 60 controls the fluid pump 70 to rotate at a high speed for a certain time, then switches to a low speed for a certain time, and then switches to the high speed again. The control module 60 controls the fluid pump 70 to alternately rotate at a first rotational speed and a second rotational speed, so that the hydraulic pressure in the cooling circuit 100 is changed suddenly and suddenly, and thus large bubbles in the cooling circuit 100 are easily broken and prevented from being attached to a fixed position. This may be due to the fact that the cooling circuit 100 flows in a complicated flow pattern due to various factors such as the inner diameter of the circuit, the nature of the heat transfer medium, and the driving force of the fluid pump 70. These factors cause the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell, which is detected by the hydraulic pressure sensor 40 in real time, to change suddenly. Therefore, even when there is no bubble in the cooling pipe 100 of the liquid cooling system of the fuel cell that affects the normal operation of the fuel cell, the first hydraulic pressure P1 in the cooling pipe 100 of the liquid cooling system of the fuel cell detected by the hydraulic pressure sensor 40 in real time may be smaller than a first calibrated hydraulic pressure value. In other words, although the fluid pump 70 is controlled to alternately rotate at a first rotational speed and at a second rotational speed to cause the fuel cell liquid cooling system to enter the bubble removal mode of operation upon detecting that the first hydraulic pressure P1 in the cooling line 100 is less than the first calibrated hydraulic pressure value, such operation also causes the fuel cell liquid cooling system to enter the bubble removal mode of operation in the absence of bubbles in the cooling line 100 that would otherwise affect the normal operation of the fuel cell.
As shown in fig. 4 and 5 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the invention is further configured to determine whether bubbles affecting the normal operation of the fuel cell exist in the cooling pipeline 100 of the liquid cooling system of the fuel cell by continuously detecting the first hydraulic pressure P1 in the cooling pipeline 100 for a certain time T2 when the hydraulic pressure sensor 40 detects in real time that the first hydraulic pressure P1 in the cooling pipeline 100 is smaller than the first calibrated hydraulic pressure value. Accordingly, as shown in fig. 4 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention is further configured to determine or determine that there is a bubble (or a bubble affecting the normal operation of the fuel cell) in the cooling line 100 of the liquid cooling system of the fuel cell when the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell detected by the hydraulic sensor 40 in real time is kept smaller than a first calibrated hydraulic pressure value for a continuous time T2 when the fluid pump 70 rotates at the first calibrated speed. Alternatively, as shown in fig. 5 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention is further configured to determine or determine that there is a bubble (or a bubble affecting the normal operation of the fuel cell) in the cooling line 100 of the liquid cooling system of the fuel cell when the fluid pump 70 rotates at the first calibrated speed and the total duration of the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell detected in real time by the hydraulic pressure sensor 40 is less than a time T1 during a continuous time T2 and is not less than a first calibrated hydraulic pressure value. It is understood that the time T2 is greater than the time T1. Preferably, the time T1 is 5s to 300s (seconds), and the time T2 is 8s to 500 s. More preferably, the time T1 is 5s to 30s, and the time T2 is 8s to 60 s. In an exemplary embodiment, the time T1 is 5s in size, and the time T2 is 15s in size. In other words, the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell is maintained for a continuous period of timeAt times T2 when the total duration of time not less than a first calibrated hydraulic pressure value (e.g., the sum of T1, T2, and T3 as shown in fig. 5) is less than the time T1, the control module 60 of the fuel cell liquid cooling system of the present invention recognizes or determines that air bubbles are present in the cooling line 100 of the fuel cell liquid cooling system (or air bubbles that affect normal fuel cell operation). At this time, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention controls the liquid cooling system of the fuel cell to enter the bubble removal operation mode and alternately rotates the fluid pump 70 at a first rotation speed and a second rotation speed. In addition, when the control module 60 controls the liquid cooling system to enter the bubble removal mode, the fluid pump 70 is controlled to alternately rotate at a first rotational speed and rotate at a second rotational speed. Preferably, the first rotational speed of the fluid pump 70 is greater than the second rotational speed. It will be appreciated that the fluid pump 70 may be configured to rotate at a first rotational speed and a second rotational speed for the same or different rotational times. After the control module 60 controls the liquid cooling system of the fuel cell to enter the bubble removal mode, the fluid pump 70 is controlled to operate at the first rotation speed for a time TFAnd then controls the fluid pump 70 to operate at the second rotational speed for a time TS. Preferably, the fluid pump 70 rotates at the first rotational speed for a running time TFGreater than the operating time T of the fluid pump 70 rotating at the second rotational speedS. Preferably, the time TFAnd the time TSNot less than 2 seconds. More preferably, the time TFNot less than 5 seconds, the time TSNot less than 3 seconds. In one exemplary embodiment, the time TFIs 8 seconds, the time TSIt was 4 seconds. Therefore, the time for the liquid cooling system of the fuel cell to clear the bubbles is T. Further, in practice, the first rotational speed of the fluid pump 70 is not less than 10% of the rated maximum rotational speed of the fluid pump 70 and is not higher than the rated maximum rotational speed of the fluid pump 70, and the second rotational speed is not higher than 60% of the rated maximum rotational speed of the fluid pump 70. In other words, the first rotational speed of the fluid pump 70 is 10% to 100% of the rated maximum rotational speed of the fluid pump 70, and the second rotational speed is 0% to 60% of the rated maximum rotational speed of the fluid pump 70.
As shown in fig. 6 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention is further configured to consider or determine that no bubble (or a bubble affecting the normal operation of the fuel cell) is detected in the cooling line 100 of the liquid cooling system of the fuel cell by the hydraulic sensor 40 when the fluid pump 70 rotates at the first calibrated speed, and the first hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell detected in real time by the hydraulic sensor 40 is kept greater than a first calibrated hydraulic pressure value for a continuous time T1. Accordingly, the control module 60 is further configured to determine that the hydraulic sensor 40 of the fuel cell liquid cooling system does not detect air bubbles in the cooling line 100 of the fuel cell liquid cooling system when the fluid pump 70 rotates at the first calibrated speed, and the first hydraulic pressure P1 in the cooling line 100 of the fuel cell liquid cooling system detected by the hydraulic sensor 40 in real time is within a continuous time T2, and the total duration of not less than a first calibrated hydraulic pressure value is not less than a time T1.
As shown in fig. 3B of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the invention is further configured to control the fluid pump 70 to rotate at a second calibrated speed when the hydraulic sensor 40 of the liquid cooling system of the fuel cell does not detect bubbles in the cooling pipe 100 of the liquid cooling system of the fuel cell while the fluid pump 70 rotates at the first calibrated speed, and further control the hydraulic sensor 40 of the liquid cooling system of the fuel cell to detect a second hydraulic pressure P2 in the cooling pipe 100 of the liquid cooling system of the fuel cell in real time while the fluid pump 70 rotates at the second calibrated speed.
As shown in fig. 7 and 8 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the invention is further configured to determine whether bubbles affecting the normal operation of the fuel cell exist in the cooling pipeline 100 of the liquid cooling system of the fuel cell by continuously detecting the second hydraulic pressure P2 in the cooling pipeline 100 for a certain time T2 when the hydraulic sensor 40 detects in real time that the second hydraulic pressure P2 in the cooling pipeline 100 is smaller than the second calibrated hydraulic pressure value. Accordingly, as shown in fig. 7 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention is further configured to determine or determine that there is a bubble (or a bubble affecting the normal operation of the fuel cell) in the cooling line 100 of the liquid cooling system of the fuel cell when the second hydraulic pressure P2 in the cooling line 100 of the liquid cooling system of the fuel cell detected by the hydraulic sensor 40 in real time is kept smaller than a second calibrated hydraulic pressure value for a continuous time T2 when the fluid pump 70 rotates at the second calibrated speed. Alternatively, as shown in fig. 8 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention is further configured to rotate the fluid pump 70 at the second calibrated speed, and the second hydraulic pressure P2 in the cooling line 100 of the liquid cooling system of the fuel cell detected in real time by the hydraulic sensor 40 is considered or determined that there is a bubble (or a bubble affecting the normal operation of the fuel cell) in the cooling line 100 of the liquid cooling system of the fuel cell when the total duration of the second hydraulic pressure P2 not less than a second calibrated hydraulic pressure value in a continuous time T2 is less than the time T1. In other words, when the second hydraulic pressure P2 in the cooling line 100 of the liquid cooling system of the fuel cell has a total duration (sum of T1, T2 and T3) not less than a second calibrated hydraulic pressure value within a continuous time T2 less than the time T1, the control module 60 of the liquid cooling system of the fuel cell of the present invention recognizes or determines that there is a bubble in the cooling line 100 of the liquid cooling system of the fuel cell (or there is a bubble that affects the normal operation of the fuel cell). At this time, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention controls the liquid cooling system of the fuel cell to enter the bubble removal operation mode and alternately rotates the fluid pump 70 at the first rotation speed and the second rotation speed. Similarly, when the control module 60 controls the liquid cooling system to enter the bubble removal mode, the fluid pump 70 is controlled to alternately rotate at a first rotational speed and a second rotational speed.
It should be noted that the first calibrated rotational speed and the second calibrated rotational speed of the fluid pump 70 of the liquid cooling system of the fuel cell according to the embodiment of the present invention are generally related to the configuration of the liquid cooling system of the fuel cell and are limited by the rated maximum rotational speed of the fluid pump 70. Generally, the first calibrated speed of the fluid pump 70 is no less than 10% of the rated maximum speed of the fluid pump 70, and the second calibrated speed is no less than 2% of the rated maximum speed of the fluid pump 70. Preferably, the first calibrated rotational speed of the fluid pump 70 is 20% to 100% of the rated maximum rotational speed of the fluid pump 70, and the second calibrated rotational speed is 10% to 60% of the rated maximum rotational speed of the fluid pump 70.
As shown in fig. 9 of the drawings, the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention is further configured to determine or determine that no bubble (or a bubble affecting the normal operation of the fuel cell) is detected in the cooling line 100 of the liquid cooling system of the fuel cell by the hydraulic sensor 40 when the second hydraulic pressure P1 in the cooling line 100 of the liquid cooling system of the fuel cell detected in real time by the hydraulic sensor 40 is kept greater than a second predetermined hydraulic pressure value for a continuous time T1 when the fluid pump 70 rotates at the second predetermined rotational speed. Accordingly, the control module 60 is further configured to determine that the second hydraulic pressure P2 in the cooling line 100 of the fuel cell liquid cooling system detected by the hydraulic sensor 40 in real time during a continuous time T2 when the total duration of not less than a second calibrated hydraulic pressure value is not less than a time T1 when the fluid pump 70 rotates at the second calibrated speed, the hydraulic sensor 40 of the fuel cell liquid cooling system is deemed or determined to not detect air bubbles in the cooling line 100 of the fuel cell liquid cooling system when the fluid pump 70 rotates at the second calibrated speed. It can be understood that when the control module 60 of the liquid cooling system of the fuel cell according to the embodiment of the present invention does not detect bubbles in the cooling pipeline 100 of the liquid cooling system of the fuel cell when the hydraulic sensor 40 of the liquid cooling system of the fuel cell rotates at the first calibrated speed in the fluid pump 70, and does not detect bubbles in the cooling pipeline 100 of the liquid cooling system of the fuel cell when the hydraulic sensor 40 of the liquid cooling system of the fuel cell rotates at the second calibrated speed in the fluid pump 70, the control module 60 determines that no bubble affecting the normal operation of the fuel cell exists in the cooling pipeline 100 of the liquid cooling system of the fuel cell, and the fuel cell can be controlled to operate normally and generate power.
It is to be noted that since the relatively large-volume bubbles are more likely to adhere to the inner wall of the cooling passage 10, the small-volume bubbles are likely to move with the flow of the heat transfer medium, and the small-volume bubbles have less influence on the heat dissipation of the liquid cooling system due to their small diameter. Therefore, the bubble detection method for the liquid cooling system of the fuel cell according to the present invention is not intended to detect the presence of bubbles of all volume sizes, but to detect the presence of bubbles that may affect the normal operation of the fuel cell. The liquid cooling system of the fuel cell detects the existence of air bubbles that may affect the normal operation of the fuel cell by monitoring in real time the change of the hydraulic pressure in the cooling circuit 100 of the liquid cooling system of the fuel cell, for example, the magnitude of the first hydraulic pressure P1 in the cooling circuit 100 when the fluid pump 70 rotates at a first calibrated speed to drive the heat transfer medium to flow in the cooling circuit 100, and the magnitude of the second hydraulic pressure P2 in the cooling circuit 100 when the fluid pump 70 rotates at a second calibrated speed to drive the heat transfer medium to flow in the cooling circuit 100. Accordingly, the liquid cooling system of the fuel cell and the bubble removing method provided by the invention are not used for removing all bubbles, but are used for removing larger bubbles which can influence the normal operation of the fuel cell so as not to influence the normal operation of the fuel cell. In addition, the liquid cooling system of the fuel cell and the bubble removing method provided by the present invention change the flow rate of the heat transfer medium by regularly or irregularly changing the rotation speed of the fluid pump 70, and change the high-time and low-time change of the hydraulic pressure in the cooling pipeline 100 of the liquid cooling system of the fuel cell, so that the hydraulic pressure borne by the bubbles changes and the bubbles are broken or move along with the flow of the heat transfer medium, and the bubbles are separated from the cooling channel 10 of the liquid cooling system of the fuel cell. Of course, the large bubble is broken, not necessarily resulting in the bubble being removed, and one or several small bubbles may be generated. These smaller volume bubbles will more easily move with the flow of the heat transfer medium and will not easily adhere to the inner wall of the cooling passage 10.
As shown in fig. 3A of the drawings, the liquid cooling system for a fuel cell according to the embodiment of the present invention further includes a liquid adding tank 81, wherein the liquid adding tank 81 communicates with the cooling pipeline 100 of the liquid cooling system for a fuel cell according to the present invention through a liquid adding pipe 82, so that a heat transfer medium can be added to the cooling pipeline 100 through the liquid adding tank 81 and the liquid adding pipe 82. Further, the liquid cooling system for a fuel cell of the present invention includes an exhaust pipe 83, wherein the exhaust pipe 83 forms an inlet 831 communicating with the cooling pipeline 100 and an outlet 832 disposed in the charging tank 81, wherein the outlet 832 of the exhaust pipe 83 is disposed above the liquid level of the heat transfer medium in the charging tank 81, so that the air bubbles in the cooling pipeline 100 can be exhausted and removed through the exhaust pipe 83. Preferably, the intake 831 of the exhaust pipe 83 is disposed between the fuel cell and the fluid pump 70.
As shown in fig. 1 to 9 of the drawings, according to an embodiment of the present invention, the present invention further provides a bubble detection system for a liquid cooling system of a fuel cell, which includes at least one hydraulic pressure sensor 40 and a control module 60, wherein the hydraulic pressure sensor 40 is disposed in a cooling pipe 100 of the liquid cooling system of the fuel cell for detecting a hydraulic pressure (heat transfer medium) in the cooling pipe 100 of the liquid cooling system of the fuel cell, and the control module 60 is electrically connected to the hydraulic pressure sensor 40 and a fluid pump 70 of the liquid cooling system of the fuel cell, so that the control module 60 can control rotation of the fluid pump 70 and receive hydraulic pressure data generated by the hydraulic pressure sensor 40.
As shown in fig. 1 to 9 of the drawings, the control module 60 of the bubble detection system for a liquid cooling system of a fuel cell according to the embodiment of the present invention is configured to control the fluid pump 70 of the liquid cooling system of the fuel cell to rotate at a first calibrated speed when receiving a self-test command of the fuel cell and control the hydraulic sensor 40 of the liquid cooling system of the fuel cell to detect a first hydraulic pressure P1 in the cooling pipeline 100 of the liquid cooling system of the fuel cell when the fluid pump 70 rotates at the first calibrated speed in real time. It is understood that the fuel cell self-test command may be from an upper computer or from an operator. Further, the control module 60 is configured to control the fluid pump 70 of the fuel cell liquid cooling system to rotate at a second calibrated speed when the first hydraulic pressure P1 is not less than a first calibrated hydraulic pressure value and control the hydraulic sensor 40 of the fuel cell liquid cooling system to detect in real time the second hydraulic pressure P2 in the cooling line 100 of the fuel cell liquid cooling system when the fluid pump 70 rotates at the second calibrated speed. As shown in fig. 1 to 11 of the drawings, according to an embodiment of the present invention, the present invention further provides a bubble elimination method for a liquid cooling system of a fuel cell, which includes the following steps:
(A) controlling a fluid pump of the liquid cooling system of the fuel cell to rotate at a first calibrated rotating speed so as to drive a heat transfer medium to flow in a cooling pipeline of the liquid cooling system of the fuel cell;
(B) detecting a first hydraulic pressure P1 in a cooling pipeline of the liquid cooling system of the fuel cell when a fluid pump of the liquid cooling system of the fuel cell rotates at the first calibrated rotating speed in real time; and
(C) and if the first hydraulic pressure P1 is smaller than a first calibrated hydraulic pressure value, controlling the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude.
As shown in fig. 1 to 11 of the drawings, according to an embodiment of the present invention, the present invention further provides a bubble elimination method for a liquid cooling system of a fuel cell, which includes the following steps:
(A) controlling a fluid pump of the liquid cooling system of the fuel cell to rotate at a first calibrated rotating speed so as to drive a heat transfer medium to flow in a cooling pipeline of the liquid cooling system of the fuel cell;
(B) detecting a first hydraulic pressure P1 in a cooling pipeline of the liquid cooling system of the fuel cell when a fluid pump of the liquid cooling system of the fuel cell rotates at the first calibrated rotating speed in real time;
(D) if the first hydraulic pressure P1 is not less than a first calibrated hydraulic pressure value, controlling the fluid pump of the liquid cooling system of the fuel cell to rotate at a second calibrated rotating speed and detecting the second hydraulic pressure P2 in the cooling pipeline of the liquid cooling system of the fuel cell in real time when the fluid pump rotates at the second calibrated rotating speed; and
(E) and if the second hydraulic pressure P2 is smaller than a second calibrated hydraulic pressure value, controlling the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention.
The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (38)
1. A liquid cooling system for a fuel cell, comprising:
a control module;
at least one first fluid tube;
at least one second fluid tube;
at least one hydraulic pressure sensor;
at least one cooling channel adapted to be disposed between flow field plates of the fuel cell;
the radiator is provided with a heat dissipation cavity, a liquid outlet and a liquid inlet, wherein the liquid outlet and the liquid inlet are respectively communicated with the heat dissipation cavity; and
at least one fluid pump, wherein the first fluid pipe is respectively communicated with the liquid outlet of the radiator and one end of the cooling channel, the second fluid pipe is respectively communicated with the liquid inlet of the radiator and the other end of the cooling channel, such that the cooling channel, the heat dissipation chamber of the heat sink, the first fluid tube and the second fluid tube form a cooling circuit, wherein the fluid pump is arranged in the cooling pipeline to drive the heat transfer medium to circulate in the cooling pipeline, wherein the hydraulic pressure sensor is provided in the cooling line to detect a hydraulic pressure in the cooling line, wherein the control module is electrically connected with the fluid pump to control the fluid pump to drive the heat transfer medium to flow in the cooling pipeline, the hydraulic sensor is electrically connectable with the control module to enable the control module to receive hydraulic data generated by the hydraulic sensor.
2. The liquid cooling system of claim 1, wherein the control module is configured to control the fluid pump of the liquid cooling system to rotate at a first calibrated speed upon receiving a fuel cell self-test command and to control the hydraulic sensor of the liquid cooling system to detect in real time a first hydraulic pressure P1 in the cooling line of the liquid cooling system when the fluid pump rotates at the first calibrated speed.
3. The liquid cooling system of claim 2, wherein the control module is configured to control the fluid pump of the liquid cooling system of the fuel cell to rotate at a second calibrated speed when the first hydraulic pressure P1 is not less than a first calibrated hydraulic pressure value and to control the hydraulic sensor of the liquid cooling system of the fuel cell to detect in real time a second hydraulic pressure P2 in the cooling line of the liquid cooling system of the fuel cell when the fluid pump rotates at the second calibrated speed.
4. The liquid cooling system of claim 2, wherein the control module is configured to control the fluid pump of the fuel cell liquid cooling system to rotate at a second calibrated speed and control the hydraulic sensor of the fuel cell liquid cooling system to detect in real time the second hydraulic pressure P2 in the cooling circuit of the fuel cell liquid cooling system when the first hydraulic pressure P1 remains no less than a first calibrated hydraulic pressure value for a continuous time T1.
5. The liquid cooling system of claim 2, wherein the control module is configured to control the second hydraulic pressure P2 in the cooling circuit of the fuel cell liquid cooling system when the first hydraulic pressure P1 is at a continuous time T2 not less than a first calibrated hydraulic pressure value for a total duration not less than a time T1, and the hydraulic sensor of the fuel cell liquid cooling system detects the rotation of the fluid pump at the second calibrated speed in real time, and the time T2 is greater than the time T1.
6. The liquid cooling system of claim 2, wherein the control module is configured to control the fluid pump of the liquid cooling system to alternately rotate at a first speed and a second speed when the first hydraulic pressure P1 is less than a first calibrated hydraulic pressure, wherein the first speed and the second speed are different in magnitude.
7. The liquid cooling system of claim 3, 4 or 5, wherein the control module is configured to control the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first speed and a second speed when the second hydraulic pressure P2 is less than a second calibrated hydraulic pressure, wherein the first speed and the second speed are different in magnitude.
8. The liquid cooling system of claim 2, wherein the control module is configured to control the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first speed and a second speed when the first hydraulic pressure P1 remains less than a first calibrated hydraulic pressure value for a continuous time T2, wherein the first speed and the second speed are different in magnitude.
9. The liquid cooling system of claim 3, 4 or 5, wherein the control module is configured to control the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first speed and a second speed when the second hydraulic pressure P1 remains less than a second calibrated hydraulic pressure value for a duration T2, wherein the first speed and the second speed are different in magnitude.
10. The liquid cooling system of claim 2, wherein the control module is configured to control the fluid pump of the fuel cell liquid cooling system to alternately rotate at a first speed and a second speed when the control module is configured to control the fluid pump of the fuel cell liquid cooling system to alternately rotate at the first speed and at the second speed when the first hydraulic pressure P1 is at continuous time T2 for a total duration not less than a first calibrated hydraulic pressure value less than time T1, wherein the first speed and the second speed are different in magnitude, and the time T2 is greater than the time T1.
11. The liquid cooling system of claim 3, 4 or 5, wherein the control module is configured to control the fluid pump of the fuel cell liquid cooling system to alternately rotate at a first speed and a second speed when the control module is configured to control the fluid pump of the fuel cell liquid cooling system to alternately rotate at the first speed and at the second speed when the first hydraulic pressure P1 is at a continuous time T2 for a total duration not less than a first calibrated hydraulic pressure value less than a time T1, wherein the first speed and the second speed are different in magnitude, and the time T2 is greater than the time T1.
12. The liquid cooling system of claim 3, 4 or 5, wherein the first calibrated rotational speed is greater than the second calibrated rotational speed, and the first calibrated hydraulic pressure value is greater than the second calibrated hydraulic pressure value.
13. The liquid cooling system of claim 12, wherein the first calibrated speed is no less than 10% of the rated maximum speed of the fluid pump and the second calibrated speed is no less than 2% of the rated maximum speed of the fluid pump.
14. The liquid cooling system of claim 4 or 5, wherein the time T1 is not less than 5 seconds.
15. A liquid cooling system according to claim 6, 8 or 10, characterized in that the liquid cooling system is adapted to cool the liquid in the cooling zoneThe time of the fluid pump rotating at the first rotating speed is TFThe time of rotation at the second rotation speed is TSWherein the time TFNot less than 5 seconds, the time TSNot less than 3 seconds.
16. The liquid cooling system of claim 7, wherein the fluid pump rotates at the first rotational speed for a time TFThe time of rotation at the second rotation speed is TSWherein the time TFNot less than 5 seconds, the time TSNot less than 3 seconds.
17. The liquid cooling system of claim 9, wherein the fluid pump rotates at the first rotational speed for a time TFThe time of rotation at the second rotation speed is TSWherein the time TFNot less than 5 seconds, the time TSNot less than 3 seconds.
18. The liquid cooling system of claim 11, wherein the fluid pump rotates at the first rotational speed for a time TFThe time of rotation at the second rotation speed is TSWherein the time TFNot less than 5 seconds, the time TSNot less than 3 seconds.
19. The liquid cooling system of claim 6, 8 or 10, wherein the fluid pump is rotated at the first rotational speed for a time TFThe time of rotation at the second rotation speed is TSWherein the time TFNot less than 5 seconds, the time TSNot less than 3 seconds.
20. The liquid cooling system of claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, further comprising at least one flow rate sensor, wherein the flow rate sensor is disposed in the cooling circuit.
21. A bubble eliminating method for a liquid cooling system of a fuel cell is characterized by comprising the following steps:
(A) controlling a fluid pump of the liquid cooling system of the fuel cell to rotate at a first calibrated rotating speed so as to drive a heat transfer medium to flow in a cooling pipeline of the liquid cooling system of the fuel cell; and
(B) and detecting the first hydraulic pressure P1 in the cooling pipeline of the liquid cooling system of the fuel cell when the fluid pump of the liquid cooling system of the fuel cell rotates at the first calibrated rotating speed in real time.
22. The bubble elimination method of claim 21, further comprising the steps of:
(C) and if the first hydraulic pressure P1 is smaller than a first calibrated hydraulic pressure value, controlling the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude.
23. The bubble elimination method of claim 21, further comprising the steps of:
(C) and if the first hydraulic pressure P1 is kept to be less than a first calibrated hydraulic pressure value in the continuous time T1, controlling the fluid pump phase of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude.
24. The bubble elimination method of claim 21, further comprising the steps of:
(C) and if the total duration of the first hydraulic pressure P1 which is not less than a first calibrated hydraulic pressure value in the continuous time T2 is less than a time T1, controlling the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude, and the time T2 is greater than the time T1.
25. The bubble elimination method of claim 21, further comprising the steps of:
(D) and if the first hydraulic pressure P1 is not less than a first calibrated hydraulic pressure value, controlling the fluid pump of the liquid cooling system of the fuel cell to rotate at a second calibrated rotating speed and detecting the second hydraulic pressure P2 in the cooling pipeline of the liquid cooling system of the fuel cell in real time when the fluid pump rotates at the second calibrated rotating speed.
26. The bubble elimination method of claim 21, further comprising the steps of:
(D) and if the first hydraulic pressure P1 is not less than a first calibrated hydraulic pressure value in the continuous time T1, controlling the fluid pump of the liquid cooling system of the fuel cell to rotate at a second calibrated rotating speed and detecting the second hydraulic pressure P2 in the cooling pipeline of the liquid cooling system of the fuel cell in real time when the fluid pump rotates at the second calibrated rotating speed.
27. The bubble elimination method of claim 21, further comprising the steps of:
(D) and if the total duration of the first hydraulic pressure P1 in the continuous time T2, which is not less than a first calibrated hydraulic pressure value, is not less than a time T1, controlling the fluid pump of the liquid cooling system of the fuel cell to rotate at a second calibrated rotating speed and detecting the second hydraulic pressure P2 in the cooling pipeline of the liquid cooling system of the fuel cell in real time when the fluid pump rotates at the second calibrated rotating speed, wherein the time T2 is greater than the time T1.
28. The bubble elimination method of claim 25, further comprising the steps of:
(E) and if the second hydraulic pressure P2 is smaller than a second calibrated hydraulic pressure value, controlling the fluid pump of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude.
29. The bubble elimination method of claim 26, further comprising the steps of:
(E) and if the second hydraulic pressure P1 is kept less than a second calibrated hydraulic pressure value in the continuous time T1, controlling the fluid pump phase of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude.
30. The bubble elimination method of claim 27, further comprising the steps of:
(E) and if the total duration of the second hydraulic pressure P2 which is not less than a second calibrated hydraulic pressure value in the continuous time T2 is less than a time T1, controlling the fluid pump phase of the liquid cooling system of the fuel cell to alternately rotate at a first rotating speed and a second rotating speed, wherein the first rotating speed and the second rotating speed are different in magnitude, and the time T2 is greater than the time T1.
31. The method of bubble elimination of claim 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30, further comprising the steps of:
(F) providing a fuel cell self-checking instruction to enable a control module of the liquid cooling system of the fuel cell to:
in the step (A), controlling a fluid pump of the liquid cooling system of the fuel cell to rotate at the first calibrated rotating speed; and
in the step (B), controlling a hydraulic pressure sensor of the liquid cooling system of the fuel cell to detect the first hydraulic pressure P1 in a cooling line of the liquid cooling system of the fuel cell in real time, wherein the step (F) is prior to the step (a).
32. A method of bubble elimination according to claim 25, 26, 27, 28, 29 or 30, further comprising the steps of:
(F) providing a fuel cell self-test command to enable a control module of the liquid cooling system of the fuel cell to be activated to:
in the step (A), controlling a fluid pump of the liquid cooling system of the fuel cell to rotate at the first calibrated rotating speed;
in the step (B), controlling a hydraulic sensor of the liquid cooling system of the fuel cell to detect the first hydraulic pressure P1 in a cooling pipeline of the liquid cooling system of the fuel cell in real time; and
in the step (D), controlling the fluid pump of the liquid cooling system of the fuel cell to rotate at a second calibrated speed and controlling the hydraulic sensor of the liquid cooling system of the fuel cell to detect in real time a second hydraulic pressure P2 in the cooling line of the liquid cooling system of the fuel cell when the fluid pump rotates at the second calibrated speed, wherein the step (F) is before the step (a).
33. Method for bubble elimination according to claim 25, 26, 27, 28, 29 or 30, characterized in that the first calibrated rotation speed is greater than the second calibrated rotation speed, the first calibrated hydraulic pressure value being greater than the second calibrated hydraulic pressure value.
34. A method for bubble elimination according to claim 25, 26, 27, 28, 29 or 30, characterized in that the first nominal rotational speed is not less than 10% of the nominal maximum rotational speed of the fluid pump and the second nominal rotational speed is not less than 2% of the nominal maximum rotational speed of the fluid pump.
35. A method for bubble elimination according to claim 23, 24, 26, 27, 29 or 30, wherein the time T1 is not less than 5 seconds.
36. A method of bubble elimination according to claim 22, 23, 24, 28, 29 or 30, wherein the fluid pump is rotated at the first rotational speed for a time TFThe time of rotation at the second rotation speed is TSWherein the time TFNot less than 5 seconds, the time TSNot less than 3 seconds.
37. A method of bubble elimination according to claim 22, 23, 24, 28, 29 or 30, wherein the fluid pump is rotated at the first rotational speed for a time TFThe time of rotation at the second rotation speed is TSWherein the time TFNot less than 5 seconds, the time TSNot less than 3 seconds.
38. Method for bubble elimination according to claim 25, 26, 27, 28, 29 or 30, characterized in that the first calibrated rotation speed is lower than the second calibrated rotation speed, the first calibrated hydraulic pressure value being lower than the second calibrated hydraulic pressure value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910215378.6A CN111725547A (en) | 2019-03-21 | 2019-03-21 | Liquid cooling system for fuel cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910215378.6A CN111725547A (en) | 2019-03-21 | 2019-03-21 | Liquid cooling system for fuel cell |
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| CN111725547A true CN111725547A (en) | 2020-09-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112201807A (en) * | 2020-10-23 | 2021-01-08 | 广州鼎奥科技有限公司 | Fuel cell's radiating structure that radiating effect is good |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112201807A (en) * | 2020-10-23 | 2021-01-08 | 广州鼎奥科技有限公司 | Fuel cell's radiating structure that radiating effect is good |
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