CN-114639848-B - Fuel cell system with low-temperature cold start function

Abstract

The invention provides a fuel cell system with a low-temperature cold start function, which comprises a temperature sensor, a fuel cell controller connected with the output end of the temperature sensor, a power cell connected with the output end of the fuel cell controller and a bidirectional DC-DC circuit module, wherein the output end of the bidirectional DC-DC circuit module is connected with a boosting DC-DC circuit module, the output end of the boosting DC-DC circuit module is connected with a fuel cell accessory system, and the fuel cell accessory system is connected with a galvanic pile. The invention can shorten the shutdown purging time, improve the service life of the system and improve the customer satisfaction when shutting down at low temperature in winter.

Inventors

• LI FEIQIANG
• WANG HAIPING
• WANG YANG
• GE WEIKANG

Assignees

• 北京亿华通科技股份有限公司

Dates

Publication Date

20260508

Application Date

20220331

Claims (1)

1. 1. A fuel cell system having a low-temperature cold start function, characterized by comprising a temperature sensor (10), a fuel cell controller (20) connected to an output terminal of the temperature sensor (10), and a power cell (30) and a bidirectional DC-DC circuit module (40) connected to an output terminal of the fuel cell controller (20); The system comprises a bidirectional DC-DC circuit module (40), a boosting DC-DC circuit module (50), a fuel cell accessory system (60), an oxygen pipeline (71) and a water vapor pipeline (72), a steam separator (73) and a compensation mechanism (74), a heat exchange sleeve (75) and a first snake-shaped infusion tube (751) are arranged at one side of the electric pile (70), the output end of the steam separator (73) is connected with the steam separator, the output end of the compensation mechanism (74) is connected with a heat exchange sleeve (75), the heat exchange sleeve (75) is arranged outside the electric pile (70), a first snake-shaped infusion tube (751) connected with the output end of the compensation mechanism (74) is arranged inside the heat exchange sleeve (75), a second snake-shaped infusion tube (752) connected with the output end of the first snake-shaped infusion tube (751) is arranged at the top end of the electric pile (70), and the second snake-shaped infusion tube (752) is arranged on the surface of the electric pile (70); The compensating mechanism (74) comprises a compensating tank (741) connected with the output end of the steam-water separator (73), the liquid inlet end of the compensating tank (741) is connected with the liquid inlet end of the first serpentine liquid conveying pipe (751) through a pump body, the gas outlet end of the compensating tank (741) is connected with a gas conveying pipe (748), the gas outlet end of the gas conveying pipe (748) is connected with a three-way pipe (747), the gas outlet end of the three-way pipe (747) is connected with a gas outlet pipe (746), the compensating mechanism (74) further comprises a rotary heating roller (742) which is arranged inside the compensating tank (741) and is rotationally connected with the compensating tank (741), two heat-conducting plates (743) which are arranged on the outer surface of the rotary heating roller (742), the compensating mechanism (74) further comprises a semiconductor refrigerator (744) which is arranged on one side surface of the heat-conducting plates (743), the compensating mechanism (74) further comprises a lifting plate (745) which is sleeved outside the rotary heating roller (742) and is slidingly connected with the outer surface of the rotary heating roller (742), the lifting plate (745) is provided with a vent hole (745), the boosting DC-DC circuit module (50) comprises an air compressor controller ACP (51), a high-voltage distribution unit PCU (52) and a step-down DCL circuit (53), wherein the air compressor controller ACP (51), the high-voltage distribution unit PCU (52) and the step-down DCL circuit (53) are connected with the output end of the bidirectional DC-DC circuit module (40), and the output ends of the high-voltage distribution unit PCU (52) and the step-down DCL circuit (53) are connected with the fuel cell accessory system (60); The inside of heat exchange sleeve (75) be equipped with a plurality of equidistance set up, and install in heat transfer fin (753) of pile (70) surface, a plurality of heat transfer fin (753) with crisscross setting of first snakelike transfer line (751), wear to be equipped with first chamfer section of thick bamboo (7451) on the casing of lifter plate (745), first chamfer section of thick bamboo (7451) cover is located rotatory heating roller (742) outside, and with rotatory heating roller (742) surface sliding connection, the bottom sliding connection of first chamfer section of thick bamboo (7451) has second chamfer section of thick bamboo (7452), second chamfer section of thick bamboo (7452) install in the surface of rotatory heating roller (742).

Description

Fuel cell system with low-temperature cold start function Technical Field The invention mainly relates to the technical field of fuel cells, in particular to a fuel cell system with a low-temperature cold start function. Background A fuel cell is a chemical device that directly converts chemical energy of fuel into electric energy, and is also called an electrochemical generator. According to a low-temperature cold start fuel cell system and a utilization method provided by patent document with application number of CN201510741934.5, the fuel cell system comprises a fuel cell system, a low-temperature cold start heating device, a fuel cell control system and an electric end, wherein the fuel cell system is respectively connected with the low-temperature cold start heating device, the fuel cell control system and the electric end, and the fuel cell control system comprises a control board and a control power supply. The system of the invention not only can accelerate the cold start of the fuel cell at low temperature, but also ensures the safe use of the electric pile, avoids the destruction of the membrane electrode of the core element of the electric pile, and is convenient for operation and control. The fuel cell system can accelerate the cold start of the fuel cell at low temperature and ensure the safe use of the electric pile, but under the condition of low temperature in winter, the conventional fuel cell system has the condition of timely low-temperature start failure, long purging time, incapability of electrifying the vehicle after parking and influence the use effect. Disclosure of Invention The present invention mainly provides a fuel cell system with a low-temperature cold start function to solve the technical problems set forth in the background art. The technical scheme adopted for solving the technical problems is as follows: A fuel cell system with low-temperature cold start function comprises a temperature sensor, a fuel cell controller connected with the output end of the temperature sensor, a power cell connected with the output end of the fuel cell controller and a bidirectional DC-DC circuit module; The output end of the bidirectional DC-DC circuit module is connected with a boosting DC-DC circuit module, the output end of the boosting DC-DC circuit module is connected with a fuel cell accessory system, and the fuel cell accessory system is connected with a pile; The boost DC-DC circuit module comprises an air compressor controller ACP, a high-voltage power distribution unit PCU and a buck DCL circuit which are connected with the output end of the bidirectional DC-DC circuit module, and the output ends of the high-voltage power distribution unit PCU and the buck DCL circuit are connected with the fuel cell accessory system; an oxygen pipeline and a water vapor pipeline are arranged on one side of the electric pile, the output end of the water vapor pipeline is connected with a steam-water separator, the output end of the steam-water separator is connected with a compensation mechanism, the output end of the compensation mechanism is connected with a heat exchange sleeve, the heat exchange sleeve is arranged outside the electric pile, and in the invention, a water vapor part is split by a three-way pipe, wherein a part enters the compensation tank under the action of a pump body between the steam-water separator and the compensation tank; The invention discloses a heat exchange device, which is characterized in that a first snake-shaped infusion tube connected with an output end of a compensation mechanism is arranged in a heat exchange sleeve, a second snake-shaped infusion tube connected with the output end of the first snake-shaped infusion tube is arranged at the top end of a galvanic pile, and the second snake-shaped infusion tube is arranged on the lower surface of the galvanic pile; the inside of the heat exchange sleeve is provided with a plurality of heat exchange fins which are equidistantly arranged and are arranged on the outer surface of the electric pile, and the heat exchange fins and the first serpentine infusion tube are arranged in a staggered manner; The compensating mechanism comprises a compensating tank connected with the output end of the steam-water separator, the infusion end of the compensating tank is connected with the liquid inlet end of the first serpentine infusion tube through a pump body, the gas outlet end of the compensating tank is connected with a gas pipe, the gas outlet end of the gas pipe is connected with a three-way pipe, and the gas outlet end of the three-way pipe is connected with a gas outlet pipe; the compensation mechanism also comprises a rotary heating roller which is arranged in the compensation tank and is rotationally connected with the compensation tank, and two heat conducting plates which are arranged on the outer surface of the rotary heating roller; the compensation mechanism also comprises a semiconductor refrigerator arranged on