Direct starting method of fuel cell system

Technical Field

The invention relates to a method for unable to provide complete start-up conditions of the start-up method of the fuel cell system.

Background Art

The fuel cell is a kind of fuel and oxidizing agent through the chemical energy in the electrocatalytic reaction on the electrode is directly converted into electric energy generating device. It is not limited by the Carnot cycle, can be efficiently converts chemical energy into electric energy. Proton exchange membrane fuel cell (PEMFC) and has the advantages of fast starting, the loss of no electrolyte, water to discharge, long service life, the specific power of the outstanding advantage of the higher specific energy, is particularly suitable as a mobile power source, has now been widely applied to an electric bus, power plant, ship, aviation and other a plurality of fields.

The fuel cell system in the course of experiment field, not the situation of providing a start-up conditions, for example, external power supply is needed in starting process, and outfield experimental unable to provide an external power supply. Although the fuel cell can be manually providing a start-up power supply, however, the entire process is relatively cumbersome, equipment needs to be a certain period of time and, moreover, because of manual operation, there may be false operation, at the same time there are also potential safety hazard. The starting method can be effective to solve the above problem, but is also simple and utility.

Relevant patents

Patent fuel cell system and fuel cell start-up method (CN100514733C public number) of the need to provide fuel cell startup method of the fuel having an optimal concentration to operate the fuel cell and start the fuel cell is reduced the required time, this method can achieve the purpose of starting the fuel cell, however, limited use range, can only be in a condition can only be completed under the environment, in the absence of a start condition, for example to provide the best concentration of the fuel is unable to start the fuel cell system.

Content of the invention

Different relevant patents and before, the purpose of this invention is to offer a kind of suitable for field method of starting the fuel cell system. The technical scheme of the invention is:

The invention relates to a fuel cell system and the direct starting method, which is used to solve the lack of the fuel cell under starting conditions when the normal starting, normal operation of the system, is a device which does not need external power supply can be the starting control method for fuel cell system. When starting the fuel cell, the air provided by the blower, the blower is usually higher than the power supply voltage of the fuel cell voltage, but also needs a stable voltage output, the voltage of the fuel cell, however, the power is increased and decreased, so the large DC/DC as the blower power supply mode. At the time of system start-up, however, because the cavity no sustainable air supply, no output voltage of the fuel cell, therefore, can not work normally large DC/DC. According to the working condition of the blower, therefore, utilizes the internal self-control the output voltage of the power supply, the use of small DC/DC drives the blower start-up. When the blower after a start-up, as a result of the continuing air supply, the fuel cell system can work normally, large DC/DC after a start-up, the power supply to the blower DC/DC. Due to large DC/DC DC/DC higher than the voltage of the voltage of the small, so large to small DC/DC will DC/DC power supply, thus may damage the small DC/DC, therefore added between the two DC/DC a diode, so that two DC/DC can be protected. After the normal start of the system, small DC/DC cut off, the normal operation of the system.

The invention has the following advantages:

1. The invention can not use the external power supply start-up, and is used for internal control electric starting, self-starting can be realized.

2. The invention can eliminate the artificial starting process, to improve the start-up efficiency, saving time;

3. The starting method for the noise-free, rapid mild reaction, the starting process can be controlled.

Description of drawings

Figure 1 is an outline of the fuel cell system a schematic diagram of one embodiment of the invention adopted.

In the attached drawing, the blower after completion of the start-up of the system the normal operation of the air blower, the required small DC/DC when starting according to the control the voltage of the power and the power required to start the blower is selected. A is a current sensor, V is a voltage sensor.

Mode of execution

To the attached Figure below the embodiment of the invention for further description.

System comprises a main control module, the fuel cell module, DC/DC module, the cooling module, the data acquisition module. Each module is connected through the wire, the total control module 232 is connected with a computer bus and tasks; fuel cell module of the fuel cell output bus after the voltage and current sensor output through two paths, one path DC/DC and is connected with the power supply to the blower, the other is connected with the output load.

Total control module includes a controller ECU, data acquisition module, solenoid valve, relay. ECU and data acquisition module is connected through the wire, solenoid valve and wire is connected with the ECU, the ECU is connected with the relay, the relay is connected through the wire the cooling module. Control module control including the fuel cell module to control the start of the closing operation, and the opening and closing of the control relay to the system voltage and current and other parameters (such as pressure, temperature) for data sampling. The embodiment of the power supply voltage of the internal the DC24V for the, selected blower, the power supply voltage range is DC292-370V, the maximum power can reach 1.5kW, therefore the small DC/DC DC24V selected for input, DC300V output, the power of 300W, so can guarantee the blower can be started normally. For large DC/DC DC130-50V the input voltage, output voltage is DC310V, ensures that large DC/DC small DC/DC the output voltage of the output voltage of higher than 3%-5%, the blower can guarantee at the same time the normal start-up. The blower of the normal work of the maximum electric current 6A, therefore, the diode allows the choice of the maximum current is 20A, in order to meet system requirements. When the system starts up, small DC/DC work, to drive the blower operation, when the blower after operation, the fuel cell will produce the electricity. When the fuel cell voltage reaches the 130-50V between the, large DC/DC will begin to work. At this moment the power supply to the blower DC/DC, the blower provides air to fuel cell, at the same time small DC/DC, completion of the start-up of the system.

The application shows that the actual test of the system, the starting method is rapid and feasible, can in a short time is fuel cell startup conditions, meet the requirement of system operation.