JP-7136012-B2 - fuel cell system

Inventors

• 小塚 智之
• 高山 干城

Assignees

• トヨタ自動車株式会社
• トヨタ自動車株式会社

Dates

Publication Date

20220913

Application Date

20190606

Priority Date

20190606

Claims (3)

1. a gas-liquid separator that separates the liquid contained in the fuel off-gas discharged from the fuel cell stack from the fuel off-gas, stores the separated liquid, and discharges it; a fuel gas pump connected to the gas-liquid separator for circulating the fuel off-gas in the gas-liquid separator to the fuel cell stack; A fuel cell system comprising The gas-liquid separator has a tubular first connection portion extending upward, The fuel gas pump has an inner wall surface forming a pump chamber, and an opening formed in a lower portion of the inner wall surface and into which the first connecting portion is inserted, A lower portion of the inner wall surface is formed to slope downward toward the opening, the tip of the first connection portion is arranged at a height equal to or lower than the extended surface along the lower portion of the inner wall surface; At the tip of the first connection portion, an inclined surface that is continuously provided to the inner peripheral surface of the first connection portion and that slopes downward toward the inner peripheral surface is formed. battery system.
2. 2. The fuel cell system according to claim 1, wherein the inclined surface is arranged on an extension surface along the lower portion of the inner wall surface.
3. An introduction pipe for introducing the fuel off-gas discharged from the fuel cell stack into the gas-liquid separator, The gas-liquid separator has a tubular second connection part into which the introduction pipe is inserted and connected, At least the bottom in the circumferential direction of the inner peripheral surface of the second connecting portion is formed so that the height becomes monotonically lower toward the downstream side from the downstream end of the introduction pipe. 3. The fuel cell system according to claim 1 or 2, wherein

Description

The present invention relates to a fuel cell system having a gas-liquid separator and a fuel gas pump. Conventionally, a gas-liquid separator that separates the water contained in the hydrogen off-gas (fuel off-gas) discharged from the fuel cell stack from the hydrogen off-gas, stores the separated water and discharges it, and is connected to the gas-liquid separator, A fuel cell system including a hydrogen gas pump (fuel gas pump) for circulating hydrogen off-gas in a gas-liquid separator to a fuel cell stack is known (see, for example, Patent Document 1). In Patent Document 1, the hydrogen gas pump is arranged on the upper surface of the gas-liquid separator, the hydrogen off-gas is sucked from the opening provided at the bottom of the hydrogen gas pump, and the fuel is delivered from the delivery part provided at the top of the hydrogen gas pump. delivered to the battery stack. JP 2019-16495 A 1 is a system configuration diagram of a fuel cell system according to one embodiment of the present invention; FIG.1 is a side view showing a structure around a gas-liquid separator and a fuel gas pump of a fuel cell system according to one embodiment of the present invention; FIG.1 is a cross-sectional view showing a structure around a gas-liquid separator and a fuel gas pump of a fuel cell system according to one embodiment of the present invention; FIG.FIG. 2 is a cross-sectional view showing the structure around the first connecting portion of the gas-liquid separator of the fuel cell system according to one embodiment of the present invention;FIG. 2 is a plan view showing the structure around the first connecting portion of the gas-liquid separator of the fuel cell system according to one embodiment of the present invention;FIG. 2 is a cross-sectional view showing the structure of the connecting portion between the gas-liquid separator and the introduction pipe of the fuel cell system according to one embodiment of the present invention;FIG. 7 is a cross-sectional view taken along line AA of FIG. 6;FIG. 10 is a diagram showing a stepped portion of a second connecting portion of a gas-liquid separator of a fuel cell system according to a first modified example of the present invention;FIG. 10 is a plan view showing the structure around the first connecting portion of the gas-liquid separator of the fuel cell system according to the second modification of the present invention;FIG. 10 is a cross-sectional view taken along line BB of FIG. 9; BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings. In the following, as an example, a case where the present invention is applied to a fuel cell mounted on a fuel cell vehicle or a fuel cell system including the same will be described, but the scope of application is not limited to such an example. . The fuel cell system 1 is mounted on a vehicle (not shown) and supplies electric power for driving the vehicle. As shown in FIG. 1 , a fuel cell system 1 includes a fuel cell stack 10 configured by stacking a plurality of fuel cells, which are unit cells, and an oxidizer for supplying an oxidant gas such as air to the fuel cell stack 10 . It has a chemical gas supply system 20 and a fuel gas supply system 30 for supplying a fuel gas such as hydrogen to the fuel cell stack 10 . The oxidant gas supply system 20 includes, for example, an oxidant gas supply channel 25 for supplying the oxidant gas to (the cathode electrode of) the fuel cell stack 10, and an oxidant gas supply channel 25 for supplying the oxidant gas to the fuel cell stack 10. and an oxidant gas discharge channel 29 for discharging the oxidant off-gas from the fuel cell stack 10 after being subjected to the electrochemical reaction. Each channel of the oxidant gas supply system 20 can be configured by piping such as a rubber hose, a metal pipe, or the like, for example. The oxygen-containing gas supply channel 25 is provided with an air cleaner 21, a compressor 22, an intercooler 23 and the like from the upstream side, and the oxygen-containing gas discharge channel 29 is provided with a muffler 28 and the like. In the oxidant gas supply channel 25, the air cleaner 21 removes dust in the oxidant gas (air, etc.) taken in from the atmosphere. The compressor 22 compresses the oxidant gas introduced through the air cleaner 21 and pumps the compressed oxidant gas to the intercooler 23 . The intercooler 23 cools the oxidant gas pumped from the compressor 22 and supplied to (the cathode electrode of) the fuel cell stack 10 by, for example, heat exchange with a coolant when passing through the oxidant gas. In the oxidant gas discharge channel 29, the muffler 28 separates the oxidant off-gas (exhaust gas) flowing through the oxidant gas discharge channel 29 into, for example, a vapor phase and a liquid phase, and discharges them to the outside. On the other hand, the fuel gas supply system 30 i