CN-116454315-B - Device for improving reliability of fuel cell system

Abstract

The invention relates to the technical field of reliability of fuel cell systems and discloses a device for improving the reliability of a fuel cell system, which comprises a galvanic pile, a hydrogen circulation loop formed by connecting with the galvanic pile, a condensed water loop formed by connecting with the galvanic pile and a heating structure, wherein the heating structure is arranged on the hydrogen circulation loop and is connected with a hydrogen outlet of the galvanic pile, the heating structure is connected with a condensed water inlet of the condensed water loop, and the heating structure is connected with a condensed water outlet of the condensed water loop. According to the invention, the hydrogen reflowing at the outlet of the electric pile is heated by the condensed water with higher temperature in the waterway, so that the liquid water after the saturated wet hydrogen is condensed again by the water dividing piece is prevented from entering the hydrogen reflow structure and the electric pile, the fault of the hydrogen reflow structure caused by the liquid water is solved, and the reliability of the electric pile is improved.

Inventors

• Deng Jingcong
• XU YUNFEI
• DING TIEXIN
• XU WEIWEI
• QU GUANSHU
• ZHANG YAN
• LI XIANCAI
• ZHANG YUHANG

Assignees

• 北京亿华通科技股份有限公司

Dates

Publication Date

20260508

Application Date

20220107

Claims (4)

1. 1. An apparatus for improving reliability of a fuel cell system, comprising: The device comprises a galvanic pile, a hydrogen circulation loop formed by connecting the galvanic pile, a condensed water loop formed by connecting the galvanic pile and a heating structure, wherein the heating structure is arranged on the hydrogen circulation loop and is connected with a hydrogen pile outlet of the galvanic pile, the heating structure is connected with a condensed water pile inlet of the condensed water loop, and the heating structure is connected with a condensed water pile outlet of the condensed water loop; The hydrogen circulation loop comprises a hydrogen reflux structure, the heating structure is connected with the hydrogen reflux structure, and one end of the hydrogen reflux structure, which is far away from the heating structure, is connected with a hydrogen stack inlet of the electric stack; The hydrogen circulation loop also comprises a water diversion piece arranged at the hydrogen outlet and a hydrogen injection valve arranged at the hydrogen inlet, the hydrogen injection valve is connected with the hydrogen reflux structure, and the hydrogen reflux structure, the hydrogen injection valve, the galvanic pile, the water diversion piece and the heating structure are sequentially connected to form the hydrogen circulation loop; the heating structure is a first heat exchange plate, the first heat exchange plate is connected with the water diversion piece, and the first heat exchange plate is connected with the hydrogen reflux structure; The device for improving the reliability of the fuel cell system further comprises a second heat exchange plate, wherein the second heat exchange plate is connected with the hydrogen injection valve, the second heat exchange plate is connected with the condensed water inlet of the condensed water loop, and the second heat exchange plate is connected with the condensed water outlet of the condensed water loop.
2. 2. The device for improving the reliability of a fuel cell system according to claim 1, wherein the condensed water loop comprises a circulating water pump, a cold start heater, a radiator and an electronic thermostat, wherein the cold start heater is connected with the radiator in parallel, the cold start heater is connected with the electronic thermostat, the radiator is connected with the electronic thermostat, the electronic thermostat is connected with the condensed water inlet, and the circulating water pump is connected with the condensed water outlet.
3. 3. The apparatus of claim 1, wherein the second heat exchanger plate is connected to a hydrogen system, and the hydrogen system supplies hydrogen.
4. 4. The apparatus of claim 1, wherein the hydrogen circulation circuit is connected to a hydrogen discharge valve.

Description

Device for improving reliability of fuel cell system Technical Field The invention relates to the technical field of reliability of fuel cell systems, in particular to a device for improving the reliability of a fuel cell system. Background The temperature, pressure and flow of the cathode and anode sides are required to be in the required range in the operation process of the fuel cell, and the performance and reliability of the fuel cell reach the optimal effect at the moment, but the actual working condition and the required working condition of the fuel cell tend to deviate due to unreasonable system arrangement. The problem of the current fuel cell system is that liquid water enters the inside of a pile to cause flooding, the liquid water enters a hydrogen backflow structure to cause the hydrogen backflow structure to break down, the proton activity of the pile is reduced due to insufficient hydrogen supply, and the potential difference between interfaces of an anode or a cathode, a motor and a membrane is increased, so that carbon corrosion and water electrolysis reaction are caused, and the problem of low voltage of a single sheet or a plurality of sheets is caused. The temperature of the hydrogen at the outlet of the electric pile after passing through the water distributing piece and the pipeline is lower than the temperature of the electric pile, so that the saturated wet hydrogen at the outlet of the electric pile can be condensed again, the condensed water can enter the hydrogen reflux structure and the electric pile, and the reliability of the hydrogen reflux structure and the electric pile is seriously reduced. Disclosure of Invention In order to solve the problem that the reliability of a fuel cell system is reduced due to the fact that liquid water enters a galvanic pile and a hydrogen circulation device in the prior art, the invention provides a device for improving the reliability of the fuel cell system. The technical scheme of the invention is as follows: An apparatus for improving reliability of a fuel cell system, comprising: The device comprises a galvanic pile, a hydrogen circulation loop formed by connecting the galvanic pile, a condensed water loop formed by connecting the galvanic pile and the heating structure, wherein the heating structure is arranged on the hydrogen circulation loop and connected with a hydrogen outlet of the galvanic pile, the heating structure is connected with a condensed water inlet of the condensed water loop, and the heating structure is connected with a condensed water outlet of the condensed water loop. Further, the hydrogen circulation loop comprises a hydrogen reflux structure, the heating structure is connected with the hydrogen reflux structure, and one end, far away from the heating structure, of the hydrogen reflux structure is connected with a hydrogen stack inlet of the electric stack. Further, the hydrogen circulation loop further comprises a water diversion piece arranged at the hydrogen outlet and a hydrogen injection valve arranged at the hydrogen inlet, the hydrogen injection valve is connected with the hydrogen reflux structure, and the hydrogen reflux structure, the hydrogen injection valve, the galvanic pile, the water diversion piece and the heating structure are sequentially connected to form the hydrogen circulation loop. Further, the heating structure is a first heat exchange plate, the first heat exchange plate is connected with the water diversion piece, and the first heat exchange plate is connected with the hydrogen backflow structure. Further, the condensate water loop comprises a circulating water pump, a cold start heater, a radiator and an electronic thermostat, wherein the cold start heater is connected with the radiator in parallel, the cold start heater is connected with the electronic thermostat, the radiator is connected with the electronic thermostat, the electronic thermostat is connected with the condensate water inlet, and the circulating water pump is connected with the condensate water outlet. Further, the device for improving the reliability of the fuel cell system further comprises a second heat exchange plate, the second heat exchange plate is connected with the hydrogen injection valve, the second heat exchange plate is connected with the condensed water inlet of the condensed water loop, and the second heat exchange plate is connected with the condensed water outlet of the condensed water loop. Further, the second heat exchange plate is connected with a hydrogen system, and the hydrogen system provides hydrogen. Further, a hydrogen discharge valve is connected to the hydrogen circulation circuit. The invention has the beneficial effects that the hydrogen reflowing at the outlet of the electric pile is heated by the condensed water with higher temperature of the waterway, so that the liquid water after the saturated wet hydrogen is condensed again by the water dividing piece is prevented from entering the hydro