Method, device and system for detecting voltage of fuel cell stack

Abstract

The application discloses a kind of voltage detection method, device and system of fuel cell stack, and wherein method includes: real-time acquisition fuel cell stack in single battery voltage value;In the first preset time period of fuel cell stack operation, if single battery voltage value is lower than first preset threshold, then determine single battery as abnormal battery;Wherein, the first preset time period is the period when fuel cell stack enters reaction gas and does not output power.The application can realize the automatic judgment of single battery good or bad in the early stage of the start of fuel cell stack, avoid the greater time and cost loss caused by the problem exposed in later running.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell stacks, in particular to a fuel cell stack cell voltage detection method, device and system. BACKGROUND

[0002] A fuel cell stack is composed of a plurality of single fuel cell monomers in series, so the overall performance of the fuel cell is closely related to the performance of the single cell.

[0003] The power range of fuel cells on the market is from 30 kilowatts to 250 kilowatts, and each group of fuel cells includes a few tens of single cell pieces, or a few hundred pieces. If one of the cells has a problem, it will affect the performance and life of the fuel cell stack as a whole, and even cause safety problems. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defect that the fuel cell stack cannot collect the voltage value of the single cell at the initial stage of starting in the prior art, and to provide a voltage detection method, device and system for fuel cell stack inspection.

[0005] The present application solves the above technical problems by the following technical solutions:

[0006] The present application provides a voltage detection method for a fuel cell stack, which comprises:

[0007] real-time collection of voltage values of single cells in the fuel cell stack;

[0008] If the voltage value of a single cell is lower than a first preset threshold value within a first preset time period of operation of the fuel cell stack, the single cell is determined to be an abnormal cell.

[0009] The first preset time period is the period when the fuel cell stack enters the reaction gas and has not yet output power.

[0010] Preferably, the voltage detection method further comprises:

[0011] If the voltage value of the abnormal cell is lower than a second preset threshold value within a second preset time period of operation of the fuel cell stack, the abnormal cell is determined to be a damaged cell.

[0012] The second preset time period is the period after the fuel cell stack is operated and outputs power.

[0013] Preferably, the voltage detection method further comprises:

[0014] If the abnormal cell is determined to be a damaged cell, the fuel cell stack is controlled to stop running.

[0015] Preferably, the specific step of collecting the voltage value of the single cell in the fuel cell stack in real time comprises:

[0016] Collecting the voltage value of the single cell in the fuel cell stack in real time through a CVM (cell voltage detector) inspection module.

[0017] Preferably, the voltage method further comprises:

[0018] Collecting the position information of the single cell in the fuel cell stack in real time through the CVM inspection module.

[0019] Preferably, the CVM inspection module comprises a plurality of collection channels, each of which is connected to a single cell in the fuel cell stack.

[0020] The application also provides a voltage detection device for a fuel cell stack, comprising an information collection module and an abnormality judgment module.

[0021] The information collection module is used to collect the voltage value of the single cell in the fuel cell stack in real time.

[0022] The abnormality judgment module is used to determine that the single cell is an abnormal cell if the voltage value of the single cell is lower than a first preset threshold value within a first preset time period of the operation of the fuel cell stack.

[0023] The first preset time period is the period when the fuel cell stack enters the reaction gas and does not output power.

[0024] Preferably, it further comprises a damage judgment module.

[0025] The damage judgment module is used to determine that the abnormal cell is a damaged cell if the voltage value of the abnormal cell is lower than a second preset threshold value within a second preset time period of the operation of the fuel cell stack.

[0026] The second preset time period is the period after the operation of the fuel cell stack and the output of power.

[0027] Preferably, it further comprises a control module.

[0028] The control module is used to control the fuel cell stack to stop operating if it is determined that the abnormal cell is a damaged cell.

[0029] The application also provides a voltage detection system for a fuel cell stack, comprising a CVM inspection module and the above-mentioned voltage detection device, wherein the CVM inspection module is used to collect the voltage value and / or position information of the single cell in the fuel cell stack in real time and send the voltage value and / or position information to the voltage detection device.

[0030] The positive progress effect of the present application is that the present application discloses a voltage detection method, device and system of a fuel cell stack, which collects voltage values of single cells of the fuel cell stack during a time period when the fuel cell stack is started to operate but does not output power, and determines that a single cell is an abnormal cell when the voltage value of the single cell is less than a first preset threshold value. The present application can automatically determine the good or bad of a single cell at the initial stage of starting the fuel cell stack, thereby avoiding greater time and cost losses caused by problems exposed during later operation. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 FIG. 1 is a flowchart of a voltage detection method of a fuel cell stack according to Embodiment 1 of the present application.

[0032] Figure 2 FIG. 2 is a structural diagram of a voltage detection device of a fuel cell stack according to Embodiment 2 of the present application.

[0033] Figure 3 FIG. 3 is a structural diagram of a voltage detection system of a fuel cell stack according to Embodiment 3 of the present application. DETAILED DESCRIPTION

[0034] The present application will be further described below by way of examples, but the present application is not limited to the scope of the examples.

[0035] Embodiment 1

[0036] The present embodiment provides a voltage detection method of a fuel cell stack. With reference to FIG. 1, Figure 1 The voltage detection method of the fuel cell stack comprises the following steps:

[0037] S1, collecting voltage values and position information of single cells in the fuel cell stack in real time.

[0038] The voltage values and position information of the single cells in the fuel cell stack can be collected in real time by using a CVM inspection module. The CVM inspection module comprises a plurality of collection channels, each of which is connected to one single cell in the fuel cell stack. The CVM inspection module collects the voltage values and position information of each single cell in the fuel cell stack through the collection channels.

[0039] S2, during a first preset time period of operation of the fuel cell stack, if the voltage value of the single cell is lower than a first preset threshold value, the single cell is determined to be an abnormal cell.

[0040] The first preset is a period when the fuel cell stack enters reaction gas and does not output power, at which time the fuel cell stack is not connected to a load. That is, the instant when the fuel cell is connected to fuel, the instant here usually refers to within 2s or within 5s after the gas switch valve is opened.

[0041] The first preset threshold value can be 0.8V. When the voltage value of the single battery is lower than 0.8V, only a record is made, and no error shutdown is directly reported, because the voltage value lower than 0.8V does not affect the operation of the entire fuel cell stack.

[0042] S3. If the voltage value of the abnormal battery is lower than the second preset threshold value in the second preset time period of the operation of the fuel cell stack, the abnormal battery is determined as a damaged battery.

[0043] The second preset time period is a period of the output power after the operation of the fuel cell stack.

[0044] The second preset threshold value can be 0.2V, and the abnormal single battery is determined as a completely damaged battery.

[0045] S4. If the abnormal battery is determined as a damaged battery, the fuel cell stack is controlled to stop operation.

[0046] In the embodiment of the present application, the voltage value of the single battery of the fuel cell stack is collected in the time period of the start of the operation of the fuel cell stack and the non-output power, and the single battery is determined as an abnormal battery when the voltage value of the single battery is lower than the first preset threshold value. The single battery can be automatically determined as good or bad in the early stage of the start of the operation of the fuel cell stack, and the loss of time and cost caused by the problem exposed in the later operation is avoided.

[0047] Embodiment 2

[0048] The embodiment provides a voltage detection device of a fuel cell stack. Referring to Figure 2 The voltage detection device of the fuel cell stack includes an information collection module 1, an abnormality determination module 2, a damage determination module 3, and a control module 4.

[0049] The information collection module 1 is used to collect the voltage value and position information of the single battery in the fuel cell stack in real time.

[0050] In the case that the fuel cell is not connected to the load, the voltage value and position information of the single battery in the fuel cell stack can be collected in real time by using the CVM inspection module. The CVM inspection module includes a plurality of collection channels, each of which is connected to one single battery in the fuel cell stack. The CVM inspection module collects the voltage value and position information of each single battery in the fuel cell stack through the collection channels.

[0051] The abnormality determination module 2 is used to determine the single battery as an abnormal battery when the voltage value of the single battery is lower than the first preset threshold value in the first preset time period of the operation of the fuel cell stack.

[0052] The first preset is a period when the fuel cell stack enters reaction gas and does not output power. That is, the instant when the fuel cell is supplied with fuel. The instant herein usually refers to within 2s or within 5s after the gas switch valve is opened.

[0053] The first preset threshold value can be 0.8V. When the voltage value of the single cell is lower than 0.8V, only a record is made, and no error shutdown is directly reported, because the voltage value lower than 0.8V does not affect the operation of the entire fuel cell stack.

[0054] The damage judgment module 3 is used to determine that the abnormal cell is a damaged cell if the voltage value of the abnormal cell is lower than the second preset threshold value in a second preset time period when the fuel cell stack operates.

[0055] The second preset time period is a period when the fuel cell stack operates and outputs power.

[0056] The second preset threshold value can be 0.2V. At this time, the abnormal single cell is determined to be completely damaged.

[0057] The control module 4 is used to control the fuel cell stack to stop operating if the abnormal cell is determined to be a damaged cell.

[0058] The embodiment of the present application can realize the automatic judgment of the single cell by collecting the voltage value of the single cell of the fuel cell stack in the time period when the fuel cell stack starts to operate but does not output power, and determining the abnormal cell when the single cell is lower than the first preset threshold value. The present application can realize the automatic judgment of the single cell at the initial stage of the start of the fuel cell stack, and avoid the greater time and cost loss caused by the problem exposed in the later operation.

[0059] Embodiment 3

[0060] The embodiment provides a voltage detection system of a fuel cell stack. Referring to Figure 3 , the voltage detection system comprises a CVM inspection module 5 and the voltage detection device described in embodiment 2. The CVM inspection module 5 is used to collect the voltage value and / or position information of the single cell in the fuel cell stack in real time, and send the voltage value and / or position information to the voltage detection device.

[0061] The embodiment of the present application can realize the automatic judgment of the single cell by collecting the voltage value of the single cell of the fuel cell stack in the time period when the fuel cell stack starts to operate but does not output power, and determining the abnormal cell when the single cell is lower than the first preset threshold value. The present application can realize the automatic judgment of the single cell at the initial stage of the start of the fuel cell stack, and avoid the greater time and cost loss caused by the problem exposed in the later operation.

[0062] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that the present application is only illustrated by way of example, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. A voltage detection method for a fuel cell stack, characterized in that, The method includes: Real-time acquisition of voltage values ​​of individual cells in a fuel cell stack, specifically including: real-time acquisition of voltage values ​​of individual cells in a fuel cell stack through a CVM inspection module; If the voltage of a single cell is lower than a first preset threshold during the first preset time period of operation of the fuel cell stack, the single cell is determined to be an abnormal cell; the first preset threshold is 0.8V. The first preset time period is the period during which the fuel cell stack enters the reaction gas and does not output power; the period is within 2 seconds or 5 seconds after the gas switch valve is opened when fuel is introduced into the fuel cell. The voltage detection method further includes: if the voltage value of the abnormal battery is lower than a second preset threshold during a second preset time period of operation of the fuel cell stack, the abnormal battery is determined to be a damaged battery; the second preset threshold is 0.2V. The second preset time period is the period after the fuel cell stack has started operating and is outputting power; If the abnormal battery is determined to be a damaged battery, then the fuel cell stack is controlled to stop operating; The CVM inspection module collects the location information of individual cells in the fuel cell stack in real time.

2. The voltage detection method for a fuel cell stack as described in claim 1, characterized in that, The CVM inspection module includes several acquisition channels, each of which is connected to a single cell in the fuel cell stack.

3. A voltage detection device for a fuel cell stack, characterized in that, Includes an information collection module and an anomaly detection module; The information acquisition module is used to collect the voltage value and position information of individual cells in the fuel cell stack in real time; when the fuel cell is not connected to a load, the voltage value and the position information are collected in real time by the CVM inspection module. The anomaly detection module is used to determine that a single cell is an abnormal cell if the voltage value of a single cell is lower than a first preset threshold during the first preset time period of operation of the fuel cell stack; the first preset threshold is 0.8V. The first preset time period is the period during which the fuel cell stack enters the reaction gas and does not output power; the period is within 2 seconds or 5 seconds after the gas switch valve is opened when fuel is introduced into the fuel cell. The voltage detection device also includes a damage judgment module; The damage determination module is used to determine that the abnormal battery is a damaged battery if the voltage value of the abnormal battery is lower than a second preset threshold during a second preset time period of operation of the fuel cell stack; the second preset threshold is 0.2V. The second preset time period is the period after the fuel cell stack has started operating and is outputting power; The voltage detection device also includes a control module; The control module is used to control the fuel cell stack to stop operating if it determines that the abnormal battery is a damaged battery.

4. A voltage detection system for a fuel cell stack, characterized in that, Includes the voltage detection device as described in claim 3.

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