Cold starting system and control method thereof

A control method and cold start technology, applied in battery/fuel cell control devices, electric vehicles, final product manufacturing, etc., can solve problems such as fuel cell voltage reversal, permanent burnout of membrane electrodes, low oxidant fuel flow, etc., to achieve Reduce the concentration, avoid local hot spots and uneven current density, and increase the effect of concentration loss

Active Publication Date: 2019-06-28
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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Problems solved by technology

[0007] In the patent US6764780B2, the method of running the fuel cell under oxygen-deficient loading is adopted. This method increases the temperature of the fuel cell by increasing the internal resistance of the fuel cell. Although this method is simple, it is difficult to control because the flow rate of the oxidant and fuel is too low, which is easy to cause the fuel cell The problem of voltage reversal, and it is easy to cause permanent burnout of the membrane electrode due to improper loading
Patent CN201320253808.1 adopts the method of inserting a heating plate inside the fuel cell. Although this method is convenient for control, it is very easy to cause a short circuit, and this method needs to process a special installation groove for installing the membrane electrode, which may easily lead to leakage of the stack

Method used

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Embodiment 1

[0037]In a fuel cell vehicle powered by a fuel cell system, starting the fuel cell at low temperature has always been a research hotspot. In the prior art, the method of heating the fuel cell by adding additional energy or changing the internal resistance of the fuel cell is generally used to increase the fuel cell temperature. battery temperature, but these methods will have some impact on fuel utilization efficiency or safety and convenience, and are not a good choice. This embodiment provides a cold start system, which includes a fuel reactor and a fuel supply pipeline , an oxidant supply pipeline, a temperature sensor and a controller; the fuel supply pipeline communicates with the fuel reactor stack for delivering fuel to the anode 10 of the fuel reactor stack; the oxidizer supply pipeline communicates with the fuel reactor stack The fuel reactor stack communicates for delivering oxidant to the cathode 12 of the fuel reactor stack, and the oxidant supply line includes an i...

Embodiment 2

[0049] This embodiment proposes a control method for a cold start system on the basis of Embodiment 1, including the following steps:

[0050] Receive vehicle start signal;

[0051] receiving the temperature information of the fuel reactor stack detected by the temperature sensor;

[0052] Judging whether the temperature of the fuel reactor reaches a temperature threshold, if so, controlling the system to perform a cold start operation to increase the temperature of the fuel reactor; if not, controlling the system to perform a normal start operation.

[0053] Specifically, when the driver starts the vehicle, the controller receives the start signal and controls the temperature sensor to work. The temperature sensor detects the temperature information of the fuel reactor. Analyze the control flow of the next step.

[0054] The cold start operation includes the following steps: the controller controls the pressure control valve 2 and the flow control valve 3 to reduce the pres...

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Abstract

The invention discloses a cold starting system which comprises a fuel reaction electric pile, a fuel supply pipeline, an oxidant supply pipeline, a temperature sensor and a controller. The fuel supplypipeline is used for conveying fuel to the anode of the fuel reaction electric pile; the oxidant supply line is used for conveying an oxidant to the cathode of the fuel reaction electric pile, and comprises an injector for injecting the oxidant to the cathode of the fuel reaction electric pile in a cold start; the temperature sensor is used for detecting temperature information of the fuel reaction electric pile and transmitting the temperature information to the controller; the injector and the temperature sensor are in communication connection with the controller. The invention further provides a method for implementing a cold starting system, and the system reduces the fuel cell efficiency by reducing the concentration of the oxidizing agent, thereby increasing the heat production amount, improving the uniformity of the oxidizing agent in the electric pile, and improving the overall performance of a vehicle.

Description

technical field [0001] The invention relates to the field of fuel cell control, in particular to a cold start system and a control method thereof. Background technique [0002] In recent years, new energy vehicles are attracting everyone's attention, and fuel cell vehicles have gradually received more and more attention. The fuel cell system includes a fuel cell stack, in which the reaction gas undergoes an electrochemical reaction to generate electric energy; and a reaction gas supply device, which supplies the fuel cell stack with the reaction gas through a reaction gas flow path. [0003] The fuel stack is a stack structure obtained by stacking hundreds of single cells, and the single cell is composed of a pair of bipolar plates sandwiching the membrane electrode MEA. The membrane electrode structure is composed of positive and negative electrodes and a polymer electrolyte membrane in the middle. [0004] When hydrogen as a fuel gas is supplied to the anode electrode of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04082H01M8/04089H01M8/04223H01M8/04225H01M8/04302H01M8/04791B60L58/31
CPCY02E60/50Y02T90/16Y02T90/40Y02P70/50
Inventor 翁鹏程李健韩旭
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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