WO2017117918A1

WO2017117918A1 - Temperature control system and method for dc-dc boost converter of fuel cell automobile

Info

Publication number: WO2017117918A1
Application number: PCT/CN2016/085894
Authority: WO
Inventors: 向华
Original assignee: 广东合即得能源科技有限公司
Priority date: 2016-01-06
Filing date: 2016-06-15
Publication date: 2017-07-13
Also published as: CN105514464A

Abstract

A temperature control system and method for a DC-DC boost converter of a fuel cell automobile. The temperature control system comprises a methyl alcohol container (1) storing liquid which is mainly methyl alcohol, a conveying pump (2) used for pumping methyl alcohol liquid in the methyl alcohol container (1) into a hydrogen preparation system by means of a conveying pipeline pump, and a DC-DC boost converter (3) used for converting low-voltage direct current output by a fuel cell (6) into high-voltage direct current required by an automobile motor (7). The DC-DC boost converter (3) is provided with a methyl alcohol temperature controller (31), and the methyl alcohol liquid flows through the methyl alcohol temperature controller (31) during a pumping process of the conveying pump (2) so as to control the working temperature of the DC-DC boost converter (3). The system and method are low in noise, have a good cooling effect, are low in energy consumption and occupy little space, and heat generated by the DC-DC boost converter (3) can be effectively utilized by a fuel cell automobile. Thus, the working and running of other electronic circuits of the fuel cell automobile will not be influenced by the fact that the heat of the DC-DC boost converter (3) is discharged.

Description

Title: Inventor Name: DC-DC Boost Converter Temperature Control System and Method for Fuel Cell Vehicles

[0001] The present invention relates to the field of fuel cell vehicles, and in particular, to a DC-DC boost converter temperature control system and method for a fuel cell vehicle.

Background technique

[0002] At present, most of the cars are fueled by gasoline and diesel, which not only consume a large amount of petroleum resources, but also cause serious air pollution from automobile exhaust. In response to this resource issue and environmental issues, the emergence of electric vehicles has become very important. An electric vehicle is a vehicle that is driven by a vehicle power source and drives the wheels with a motor. Electric vehicles include pure electric vehicles, hybrid vehicles and fuel cell vehicles. Fuel cell A car is an electric car equipped with a fuel cell as a power source for obtaining a driving force. The fuel cell of a fuel cell car is used for electrochemical reaction of hydrogen and oxygen in the air to generate electric energy. The fuel cell generates electricity with a DC voltage of 15 to 35 V, but the power required by the automobile motor is usually 200 to 750 V DC. Therefore, the fuel cell vehicle also needs to be equipped with a DC-DC boost converter for the fuel cell. The low voltage DC voltage boost is converted to the high voltage DC voltage required by the automotive motor.

[0003] The DC-DC boost converter of a fuel cell vehicle usually emits a large amount of heat during operation, and therefore, temperature control of the DC-DC boost converter is critical. In the prior art, the temperature control device of the DC-DC boost converter usually adopts an air-cooled heat sink, but the air-cooled heat sink of the DC-DC boost converter has at least the following defects: First, the air-cooled heat sink The cooling fan has high noise, which is not conducive to the noise reduction of the fuel cell system. Second, due to the slow heat dissipation of the air, the heat dissipation efficiency of the air-cooled heat sink is low. When the DC-DC boost converter has power adjustment, it is easy. The peak temperature occurs, destroying the DC-DC boost converter; Third, the cooling fan of the air-cooled radiator itself needs power supply to maintain operation, and the energy consumption is high; fourth, the heat generated by the DC-DC boost converter is The cooling fan blows away, wasting heat energy; Fifth, the heat discharged by the D C-DC boost converter is likely to adversely affect the internal electronic circuit of the car.

[0004] With the development of liquid-cooled heat sink technology, liquid-cooled heat sinks have also been gradually applied to DC-DC boost converters of fuel cell vehicles. Chinese patent 200810246572.2 (application date: 2008-12-25, applicant: Tsinghua University) publicly listed a fuel cell city bus car cooling circulation system, the system water tank, radiator The booster pump, the DC/DC converter, the auxiliary DC/DC converter, the motor controller, and the motor are connected by a steel pressure pipe to realize the water connection of the cooling system, and the control system controls the boosting pump of the cooling system to realize Water circulation, its heat dissipation efficiency is better.

[0005] However, the cooling cycle system disclosed in the above-mentioned patent 200810246572.2 has the following drawbacks:

The cooling circulation system needs to be provided with a water tank, a booster pump and a radiator. The booster pump drives the water in the water tank to flow through the DC/DC converter and the radiator. When the DC/DC converter reaches a certain temperature, the radiator works (hidden Containing fans), cooling; this not only increases equipment costs, takes up a lot of space, but also requires the energy itself to keep running; second, the heat generated by the DC-DC boost converter is still It is wasted by the heat sink and wastes heat. Third, the heat discharged by the DC-DC boost converter is still very easy to adversely affect the internal electronic circuit of the car.

technical problem

[0006] The technical problem to be solved by the present invention is to provide a DC-DC boost converter temperature control system for a fuel cell vehicle, and the DC-DC boost converter temperature control system noise for the above-mentioned deficiencies in the prior art. Low, good heat dissipation, low energy consumption, small footprint, and fuel cell vehicles can effectively utilize the heat generated by the DC-DC boost converter, without affecting the fuel cell due to the heat output of the DC-DC boost converter The other electronic circuits of the car work. To this end, the present invention also provides a temperature control method for the DC-DC boost converter temperature control system.

Problem solution

Technical solution

[0007] In order to solve the above first technical problem, the technical solution of the present invention is: A DC-DC boost converter temperature control system for a fuel cell vehicle, comprising:

[0008] a methanol container in which a methanol-based liquid is stored;

[0009] a transfer pump for pumping methanol liquid in the methanol container to the hydrogen production system through the delivery pipe;

[0010] a DC-DC boost converter for converting low-voltage direct current output from a fuel cell into high-voltage direct current required for an automobile motor; the DC-DC boost converter having a methanol temperature controller, wherein the methanol liquid is During the pumping process of the transfer pump, the methanol temperature controller is passed to control the operating temperature of the DC-DC boost converter; [0011] a hydrogen production system for hydrogen production from methanol, and the hydrogen produced is supplied to the fuel cell. ;

[0012] a fuel cell for electrochemical reaction of hydrogen and oxygen in the air to generate low-voltage direct current, the low voltage The DC power is converted into high voltage direct current through a DC-DC boost converter and supplied to the automobile motor;

And a control system for controlling the operation of the transfer pump, the DC-DC boost converter, the hydrogen production system, and the fuel cell.

[0014] Preferably, the DC-DC boost converter temperature control system further includes a three-way regulating diverter valve and a three-way confluence valve, wherein the inlet port of the three-way regulating diverter valve is in communication with the transfer pump, The methanol liquid pumped by the pump is divided into two fluids through the three-way regulating diverter valve, wherein the first fluid passes through the methanol temperature controller of the DC-DC boost converter and enters the three-way confluence valve, and the second fluid directly Enter the three-way confluence valve; the two fluids are combined in the three-way confluence valve and sent to the hydrogen production system. Further, the DC-DC boost converter is provided with a temperature sensor, and the temperature sensor is electrically connected to the control system.

[0015] Preferably, the hydrogen production system comprises a heat exchanger and a reformer, the heat exchanger is installed on a conveying pipe of a methanol liquid, the methanol liquid is in the heat exchanger, and the high temperature hydrogen gas is outputted from the reformer. Performing heat exchange, the temperature of the methanol liquid is raised, and the temperature of the hydrogen is lowered; the reformer is provided with a reforming chamber, a heating device and a hydrogen purifying device, and the heating device provides heat energy of a temperature of 350-570 ° C for the reforming chamber; The reforming chamber is provided with a catalyst 1J, and in the reforming chamber, a hydrogenation reaction of methanol and water occurs to produce a high-temperature mixed gas mainly composed of carbon dioxide and hydrogen; and the reforming chamber is connected with a hydrogen purifying device. The pipeline connection, all or part of the connecting pipeline is disposed in the reforming chamber, and can continue to heat the high-temperature mixed gas output from the reforming chamber through the high temperature in the reforming chamber; the connecting pipeline serves as a reforming chamber and a hydrogen purifying device The buffering is such that the temperature of the high temperature mixed gas output from the reforming chamber is the same as or close to the temperature of the hydrogen purifying device; hydrogen gas is obtained from the gas producing end of the hydrogen purifying device, After air through the heat exchanger to the output of the fuel cell.

[0016] Preferably, the heating device of the reformer is an electric heater or an electromagnetic heater or a hydrogen fuel chamber.

[0017] In order to solve the above second technical problem, the technical solution of the present invention is: A temperature control method for a DC-DC boost converter temperature control system of a fuel cell vehicle, comprising the following steps:

[0018] (1) The methanol liquid in the methanol container flows through the methanol temperature controller of the DC-DC boost converter under the pumping force of the transfer pump, and the methanol liquid flows through the methanol temperature controller. Take away the heat in the DC-DC boost converter and raise the temperature of the methanol liquid;

[0019] (2) the methanol liquid after the temperature rise enters the hydrogen production system, in the hydrogen production system, the temperature of the methanol liquid continues to rise, the methanol and water undergo a reforming hydrogen production reaction, and hydrogen is produced and supplied to the fuel cell;

[0020] (3) In the fuel cell, hydrogen and oxygen in the air react electrochemically to generate low-voltage direct current, The low-voltage direct current is converted into high-voltage direct current by a DC-DC boost converter and supplied to the automobile motor.

[0021] Preferably, the methanol liquid pumped by the pump is divided into two channels by a three-way regulating diverter valve, wherein the first channel fluid enters the tee through the methanol temperature controller of the DC-DC boost converter Confluence valve, the second fluid directly enters the three-way confluence valve; the two fluids are combined in the three-way confluence valve and sent to the hydrogen production system; the control system adjusts the diversion through the three-way according to the temperature of the DC-DC boost converter The valve controls the flow of methanol liquid flowing through the methanol temperature controller. When the temperature of the DC-DC boost converter is too high, the control system controls the three-way regulating diverter valve to increase the flow rate of the first fluid, and the flow rate of the second fluid is Corresponding reduction; When the DC-DC boost converter temperature is low, the control system controls the three-way regulating diverter valve to reduce the flow of the first fluid, and the flow of the second fluid is correspondingly increased.

[0022] Preferably, the DC-DC boost converter is provided with a temperature sensor that feeds back a temperature signal of the DC-DC boost converter to the control system, and the control system adjusts according to the temperature signal. The flow of methanol liquid flowing through the methanol temperature controller to control the temperature of the DC-DC boost converter to be within a set range.

Advantageous effects of the invention

Beneficial effect

[0023] The beneficial effects of the present invention are as follows: 1. The DC-DC boost converter of the present invention uses a methanol temperature controller to dissipate heat, and does not need to additionally provide a booster pump and a fan, which occupies small space and is noise-free, and is beneficial to the entire fuel. The battery layout and noise reduction of the battery car; Second, the methanol temperature controller of the DC-DC boost converter skillfully uses the methanol liquid to take away the heat generated by the DC-DC boost converter, without the need to additionally provide a liquid cooling fan. No need to consume electric energy; Third, the methanol liquid takes away the heat generated by the DC-DC boost converter, which can raise the temperature of the methanol liquid, so that the heat generated by the DC-DC boost converter is skillfully utilized; Moreover, the heat generated by the DC-DC boost converter is utilized, so that the DC-DC boost converter does not discharge heat to the interior of the fuel cell vehicle, thereby ensuring the operational stability of the fuel cell vehicle. In addition, in a preferred mode of the present invention, a three-way regulating diverter valve and a three-way confluence valve are provided, so that the control system of the present invention can adjust the flow of the methanol temperature controller according to the temperature signal of the DC-DC boost converter. The methanol liquid flow rate is controlled to be stable and reliable by controlling the temperature of the DC-DC boost converter within a set range. Brief description of the drawing

DRAWINGS 1 is a block diagram showing the overall structure of the present invention.

2 is a block diagram showing the overall structure of a preferred embodiment of the present invention.

Embodiments of the invention

The structural principle and working principle of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] As shown in FIG. 1, the present invention is a DC-DC boost converter temperature control system for a fuel cell vehicle, including

[0028] The methanol container 1 stores therein a methanol-based liquid, preferably an aqueous methanol solution;

[0029] a transfer pump 2 for pumping the methanol liquid in the methanol container 1 to the hydrogen production system through the delivery pipe; [0030] a DC-DC boost converter 3 for converting the low voltage direct current output of the fuel cell 5 The high-voltage direct current required for the automobile motor 7, the low-voltage direct current is usually 15~35V direct current, the high-voltage direct current is usually 200~750V direct current; the DC-DC boost converter 3 has a methanol temperature controller 31, The methanol liquid flows through the methanol temperature controller 31 during the pumping process of the transfer pump 2 to control the operating temperature of the DC-DC boost converter 3;

[0031] a hydrogen production system for hydrogen production from methanol, the hydrogen produced is supplied to the fuel cell 6;

[0032] The fuel cell 6, for the electrochemical reaction of hydrogen and oxygen in the air to generate low-voltage direct current, at the anode of the fuel cell: 2H ₂ → 4H ++ 4e -, H ₂ split into two protons and two electrons, Protons pass through the proton exchange membrane (PEM), electrons pass through the anode plate, pass through the external load, and enter the cathode bipolar plate at the cathode of the fuel cell: 0 ₂ +4e -+4H +→2H ₂ 0, protons, electrons and 0 ₂ recombined to form 11 ₂ 0; the low voltage direct current is converted into high voltage direct current by the DC-DC boost converter 3, and then supplied to the automobile motor 7;

And a control system (not shown) for controlling the operation of the transfer pump 2, the DC-DC boost converter 3, the hydrogen production system, and the fuel cell 6.

[0034] As shown in FIG. 2, the DC-DC boost converter temperature control system further includes a three-way regulating diverter valve 8 and a three-way confluence valve 9, the three-way regulating diverter valve 8 inlet and delivery The pump 2 is in communication, and the methanol liquid pumped by the pump 2 is divided into two channels by the three-way regulating diverter valve 8, wherein the first channel fluid passes through the methanol temperature controller 31 of the DC-DC boost converter 3. Entering the three-way confluence valve 9, the second fluid directly enters the three-way confluence valve 9; the two fluids are merged in the three-way confluence valve 9, and then sent to the hydrogen production system, through the control of the three-way regulating diverter valve 8, The surface makes the temperature of the DC-DC boost converter within the set range, stable and reliable. Enter In one step, the DC-DC boost converter 3 is provided with a temperature sensor (not shown), and the temperature sensor is electrically connected to the control system, so that the control system can monitor the DC-DC boost conversion. The temperature of the device 3.

[0035] In the above technical solution, the hydrogen production system includes a heat exchanger 5 and a reformer 4, the heat exchanger 5 is installed on a conveying pipe of a methanol liquid, and the methanol liquid is in the heat exchanger 5, The high-temperature hydrogen outputted by the reformer 4 performs heat exchange, the temperature of the methanol liquid rises, and the temperature of the hydrogen gas decreases. The reformer 4 is provided with a reforming chamber 41, a heating device 42, and a hydrogen purifying device 43, wherein the heating device 42 is The reforming chamber 41 provides thermal energy at a temperature of 350-570 ° C; the reforming chamber 41 is provided with a catalyst, and under the action of the catalyst, a methanol cracking reaction and a carbon monoxide shift reaction are generated to generate hydrogen gas and carbon dioxide, which is more than one. Component, multi-reaction gas-solid catalytic reaction system, the reaction equation is: (l) CH ₃ OH → CO + 2H ₂ , (2) H ₂ 0 + CO → CO ₂ + H ₂ , (3) CH ₃ OH + H ₂ 0→C0 ₂ +3H ₂ , a high-temperature mixed gas mainly composed of carbon dioxide and hydrogen; the reforming chamber 41 and the hydrogen purifying device 43 are connected by a connecting pipe, and all or part of the connecting pipe is set in the reforming In the chamber 41, the heating can be continued from the reforming chamber 41 by the high temperature in the reforming chamber 41. a high-temperature mixed gas; the connecting line acts as a buffer between the reforming chamber 41 and the hydrogen purifying device 43, so that the temperature of the high-temperature mixed gas output from the reforming chamber 41 is the same as or close to the temperature of the hydrogen purifying device 43; Hydrogen is obtained from the gas producing end of the hydrogen purifying unit 43, and the hydrogen is supplied to the fuel cell 6 via the heat exchanger 5.

In the above technical solution, the heating device 42 of the reformer 4 may be an electric heater or an electromagnetic heater or a hydrogen fuel chamber, preferably an electromagnetic heater. For details, refer to Chinese Patent Application No. 2,151,075,438, 1.7.

[0037] The temperature control method of the DC-DC boost converter temperature control system of the fuel cell automobile includes the following steps: [0038] (1) The methanol liquid in the methanol container flows under the pumping force of the transfer pump Through the methanol temperature controller of the DC-DC boost converter, the methanol liquid takes away the heat in the DC-DC boost converter during the flow through the methanol temperature controller, and raises the temperature of the methanol liquid;

[0039] (2) the methanol liquid after the temperature rise enters the hydrogen production system, in the hydrogen production system, the temperature of the methanol liquid continues to rise, the methanol and water undergo a reforming hydrogen production reaction, and hydrogen is produced and supplied to the fuel cell;

[0040] (3) In the fuel cell, hydrogen gas and oxygen in the air electrochemically react to generate low-voltage direct current, which is converted into high-voltage direct current by a DC-DC boost converter and supplied to the automobile motor.

[0041] As a preferred mode of the present invention, the methanol liquid pumped by the transfer pump is divided into two channels by a three-way regulating diverter valve, wherein the first path fluid passes through the methanol temperature controller of the DC-DC boost converter. After entering the three links Confluence valve, the second fluid directly enters the three-way confluence valve; the two fluids are combined in the three-way confluence valve and sent to the hydrogen production system; the control system adjusts the diversion through the three-way according to the temperature of the DC-DC boost converter The valve controls the flow of methanol liquid flowing through the methanol temperature controller. When the temperature of the DC-DC boost converter is too high, the control system controls the three-way regulating diverter valve to increase the flow rate of the first fluid, and the flow rate of the second fluid is Corresponding reduction; When the DC-DC boost converter temperature is low, the control system controls the three-way regulating diverter valve to reduce the flow of the first fluid, and the flow of the second fluid is correspondingly increased.

[0042] Further, the DC-DC boost converter is provided with a temperature sensor, and the temperature sensor actually feeds back a temperature signal of the DC-DC boost converter to the control system, and the control system adjusts according to the temperature signal. The flow of methanol liquid flowing through the methanol temperature controller to control the temperature of the DC-DC boost converter to be within a set range.

The above is only the preferred embodiment of the present invention, and any minor modifications, equivalent changes and modifications to the above embodiments in accordance with the technical solutions of the present invention are within the scope of the technical solutions of the present invention.

Industrial applicability

[0044] The present invention is a fuel cell vehicle DC-DC boost converter temperature control system and method, the DC-DC boost converter temperature control system has low noise, good heat dissipation effect, low energy consumption, and small space occupation And the fuel cell vehicle can effectively utilize the heat generated by the DC-DC boost converter, and does not affect the operation of other electronic circuits of the fuel cell vehicle due to the discharge of the heat of the DC-DC boost converter. Therefore, it has industrial applicability.

Claims

Claim

A DC-DC boost converter temperature control system for a fuel cell vehicle, comprising: a methanol container in which a methanol-based liquid is stored;

a transfer pump for pumping methanol liquid in a methanol container to a hydrogen production system through a transfer line

a DC-DC boost converter for converting low-voltage direct current output from a fuel cell into high-voltage direct current required for an automobile motor; the DC-DC boost converter having a methanol temperature controller, the methanol liquid being in a transfer pump During the pumping process, flowing through the methanol temperature controller to control the operating temperature of the DC-DC boost converter;

a hydrogen production system for hydrogen production from methanol, and the produced hydrogen is supplied to the fuel cell;

A fuel cell for electrochemically reacting oxygen in hydrogen and air to generate low-voltage direct current, which is converted into high-voltage direct current by a DC-DC boost converter and supplied to an automobile motor;

The DC-DC boost converter temperature control system according to claim 1, wherein: said DC-DC boost converter temperature control system further comprises a three-way regulating diverter valve and a three-way confluence valve, said three The inlet port of the regulating diverter valve is in communication with the transfer pump, and the methanol liquid pumped by the transfer pump is divided into two channels by a three-way regulating diverter valve, wherein the first channel fluid passes through the D C-DC boost converter After the methanol temperature controller enters the three-way confluence valve, the second fluid directly enters the three-way confluence valve; after the two fluids are merged in the three-way confluence valve, the two-way confluence valve is delivered to the hydrogen production system according to claim 2 The boost converter temperature control system is characterized in that: the DC-DC boost converter is provided with a temperature sensor, and the temperature sensor is electrically connected to the control system.

The DC-DC boost converter temperature control system according to claim 1, wherein: the hydrogen production system comprises a heat exchanger and a reformer, and the heat exchanger is installed on a conveying pipe of a methanol liquid, The methanol liquid is in the heat exchanger and exchanges heat with the high temperature hydrogen output from the reformer. The temperature of the methanol liquid is increased, and the temperature of the hydrogen is lowered; the reformer is provided with a reforming chamber, a heating device and a hydrogen purifying device, and the heating device provides a temperature of 350-570 ° C for the reforming chamber; The whole chamber is provided with a catalyst, and in the reforming chamber, a hydrogenation reaction of methanol and water occurs to produce a high-temperature mixed gas mainly composed of carbon dioxide and hydrogen; and the reforming chamber and the hydrogen purifying device are connected through a connecting pipe, and are connected. All or part of the pipeline is disposed in the reforming chamber, and the high-temperature mixed gas output from the reforming chamber can be continuously heated by the high temperature in the reforming chamber; the connecting pipeline acts as a buffer between the reforming chamber and the hydrogen purifying device, so that The temperature of the high temperature mixed gas output from the reforming chamber is the same as or close to the temperature of the hydrogen purifying device; hydrogen gas is obtained from the gas producing end of the hydrogen purifying device, and the hydrogen gas is output to the fuel cell through the heat exchanger

[Claim 5] The DC-DC boost converter temperature control system according to claim 4, wherein the heating device of the reformer is an electric heater or an electromagnetic heater or a hydrogen fuel chamber.

[Claim 6] The temperature control method of the DC-DC boost converter temperature control system of the fuel cell vehicle according to any one of claims 1 to 5, characterized in that it comprises the following steps:

(1) The methanol liquid in the methanol container flows through the methanol temperature controller of the DC-DC boost converter under the pumping force of the transfer pump, and the methanol liquid takes away the DC during the process of flowing through the methanol temperature controller. - heat in the DC boost converter and raise the temperature of the methanol liquid;

(2) The methanol liquid after the temperature rise enters the hydrogen production system. In the hydrogen production system, the temperature of the methanol liquid continues to rise, and the methanol and water undergo a reforming hydrogen production reaction to produce hydrogen gas, which is supplied to the fuel cell;

(3) In the fuel cell, hydrogen gas and oxygen in the air react electrochemically to generate low-voltage direct current, which is converted into high-voltage direct current by a DC-DC boost converter and supplied to the automobile motor.

[Claim 7] The temperature control method of the DC-DC boost converter temperature control system according to claim 6, wherein: the methanol liquid pumped by the transfer pump is divided into two paths after adjusting the diverter valve through the three-way a fluid, wherein the first fluid passes through the methanol temperature controller of the DC-DC boost converter and enters the three-way confluence valve, and the second fluid directly enters the three-way confluence valve; after the two fluids merge in the three-way confluence valve , to the hydrogen production system; the control system is based on the temperature of the DC-DC boost converter Degree, through the three-way regulating diverter valve to control the flow of methanol liquid flowing through the methanol temperature controller, when the temperature of the D C-DC boost converter is too high, the control system controls the three-way regulating diverter valve to increase the flow rate of the first fluid The flow rate of the second fluid is correspondingly reduced; when the temperature of the DC-DC boost converter is low, the control system controls the three-way regulating diverter valve to reduce the flow of the first fluid, and the flow of the second fluid is correspondingly increased. .

[Claim 8] The temperature control method of the DC-DC boost converter temperature control system according to claim 7, wherein: the DC-DC boost converter is provided with a temperature sensor, and the temperature sensor is反馈 The temperature signal of the DC-DC boost converter is fed back to the control system, and the control system adjusts the flow rate of the methanol liquid flowing through the methanol temperature controller according to the temperature signal to control the temperature of the DC-DC boost converter to be set. In the range.