CN114361530A - Proton exchange membrane fuel cell stack batch pre-activation method and device - Google Patents
Proton exchange membrane fuel cell stack batch pre-activation method and device Download PDFInfo
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Abstract
The invention provides a fuel cell stack batch pre-treatment activation method and a device, wherein a stack which is formed by initial installation is subjected to air tightness detection, and the stack with the air tightness reaching the standard is transferred to a fuel cell stack pre-activation device, wherein the pre-activation device comprises a hydrogen circulation system, a nitrogen circulation system, a cooling liquid circulation system, a control system, an upper computer and the like; then introducing cooling liquid, and circularly introducing the cooling liquid with a certain temperature into the galvanic pile to ensure that the temperature of the galvanic pile is increased and kept at a set temperature; introducing gas, circularly introducing nitrogen with certain flow, pressure, humidity and temperature into the cathode of the galvanic pile, namely an air inlet, and circularly introducing hydrogen with certain flow, pressure, humidity and temperature into the anode and a hydrogen inlet; and finally, carrying out simple on-line variable current activation on the galvanic pile to finish the activation. The method and the device further improve the overall activation efficiency of the galvanic pile, reduce the activation cost and provide an important technical basis for the batch production of the galvanic pile.
Description
Technical Field
The invention relates to the technical field of auxiliary devices and methods, in particular to a method and a device for batch pre-activation of proton exchange membrane fuel cell stacks.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) have the characteristics of high energy conversion efficiency, high response speed, good low-temperature starting performance, no pollution, low emission and the like, have very wide application prospects in the fields of fixed power stations, standby power supplies, transportation, aerospace, war industry and the like, and are particularly concerned about application in fuel cell automobiles. At present, the world known automobile manufacturing companies such as Toyota, modern and Benz strongly support the development of fuel cell automobiles, and particularly since the Mirai fuel cell automobiles are introduced from Toyota in 2014, the development of PEMFC related technology has become a research hotspot of global attention.
After the PEMFC is manufactured, it needs to be subjected to an activation test to reach an optimum state. The performance of PEMFCs gradually rises through the activation process, and then reaches an equilibrium, at which point the activation process is finished. The core component of a PEMFC is a Membrane Electrode Assembly (MEA), and the activation of the PEMFC is the activation of the MEA, i.e., the improvement of the performance of the MEA. The MEA activation mechanism is rather complex and is generally considered to include the following processes: (1) humidifying the proton exchange membrane; (2) establishing a substance (including electrons, protons, gas and water) transmission channel; (3) optimizing the electrode structure; (4) the activity and the utilization rate of the catalyst layer (mainly cathode Pt catalyst) are improved. Therefore, the activation process is critical to the function of the catalyst, affecting the life of the MEA.
The activation types are mainly classified into three types according to the activation mechanism of PEMFCs: preactivation type, on-line discharge activation type, and restorative activation type. No matter which activation technology is adopted, all need can be realized with the help of some devices and equipment, use at present most, the broadest activation method still is online discharge activation, equipment with the help of is mainly the fuel cell testboard, realize the activation through forms such as constant current, constant voltage or variable load, activation time generally is 2 ~ 5h, activation time is long, and is with high costs, is unfavorable for the high-efficient production in batches of fuel cell pile, and the development of novel efficient activation device and equipment can make activation efficiency further promote, reduces the activation cost. At present, the research on devices for activating fuel cells in China is relatively few, and particularly, the research on pre-activation equipment and batch activation equipment of the fuel cells still has a great promotion space.
The invention patent CN 113224353A discloses a method and a device for automatically activating a fuel cell stack, which comprises the following steps: electronic load, voltage polling instrument, controller, galvanic pile, fan, fuel gas supply pipeline, fuel gas discharge pipe chariot, control platform. The electronic load (with output power of 0-5kW) is connected with the anode and the cathode of the galvanic pile, has an editing function, can realize constant-voltage, constant-current and constant-power work, can be manually input into an activation process, has the functions of suspending, continuing and starting the activation process, and can manually control the working state of the electronic load.
However, the activation method and apparatus mentioned in the above patent are mainly applied to an air-cooled fuel cell short stack, and require that the output power of the electronic load is 0-5kW, i.e. the corresponding power of the activated stack does not exceed 5kW, and the application has a great limitation, and require that the electronic load has an editing function, can implement constant voltage, constant current, and constant power operation, can manually input the activation process, has the functions of suspending, continuing, and starting the activation process, can manually control the operating state of the electronic load, etc., and have a high functional requirement on the electronic load, which is not favorable for matching and type selection, and the apparatus cost is high.
In addition, the online loading activation of the galvanic pile is mainly realized by monitoring parameters such as voltage, current, temperature, power, time and the like, gas resources still need to be consumed in real time, and the influence of a new activation method and a new activation device which are not explicitly provided in the patent on the activation mechanism, the activation efficiency, the time and the cost of the galvanic pile is insufficient in beneficial effect analysis.
Meanwhile, the air-cooled fuel cell batch activation device mentioned in the patent adopts an array multi-channel mode, each electric pile is connected with the load of a control cabinet, each electric pile is respectively provided with a fan, a temperature measuring point and the like, the structure of the device can be predicted to be very complex and tedious, and the manufacturing cost of the device can be increased undoubtedly.
Disclosure of Invention
The invention provides a method and a device for pre-activating proton exchange membrane fuel cell stacks in batches, which can realize synchronous pre-treatment activation of a plurality of stacks before the stacks are not discharged, and mainly starts from mechanisms such as pre-wetting of stack membrane electrodes, electrode structure optimization, effective construction of a three-phase interface and the like to perform synchronous circulating ventilation treatment on the plurality of stacks, wherein gas is in a high-pressure, high-humidity and high-temperature state, no electrochemical reaction occurs in the pre-activation process, no electronic load is needed, the gas is recycled in the pre-activation process, almost no consumption is caused, and a simple variable current online activation method is combined, so that the overall activation efficiency of the stacks is further improved, the activation cost is reduced, and an important basis is provided for batch production of the stacks.
The technical means adopted by the invention are as follows:
a fuel cell stack batch pretreatment activation method is characterized by comprising the following steps:
step S1: carrying out air tightness detection on the initially-assembled and formed galvanic pile, and transferring the galvanic pile with the air tightness reaching the standard to a fuel cell galvanic pile pre-activation device;
step S2: introducing cooling liquid, continuously and circularly introducing the cooling liquid with a certain temperature into the galvanic pile, keeping the flow fixed, and raising the temperature of the galvanic pile and keeping the temperature at a set temperature;
step S3: setting the humidifying dew point temperature of nitrogen and hydrogen; the humidifying dew point temperature of the nitrogen and the hydrogen is more than or equal to the temperature of the cooling liquid introduced into the galvanic pile, so that the gas entering the galvanic pile is humidified by more than or equal to 100 percent;
step S4: introducing gas, and introducing nitrogen with certain flow, pressure and temperature to a cathode of the electric pile, namely an air inlet when the humidifying dew point temperature of the gas reaches a set value;
the method comprises the steps of adjusting a proportional valve, introducing hydrogen with certain flow, pressure and temperature to an anode of the galvanic pile, namely a hydrogen inlet, and adjusting the pile-entering pressure of the nitrogen and the hydrogen by adjusting a pressure reducing valve, wherein the pile-entering pressure of the nitrogen is 150kPa, the pile-entering pressure of the hydrogen is 170kPa, and the pressure of the hydrogen is controlled to be always greater than the pressure of the nitrogen by 10-20 kPa; continuously performing aeration and cooling liquid circulation for a time T1, then intermittently performing for a period of time T2, performing 1-round pre-activation, circulating for 2-3 rounds, and completing the pre-activation;
step S5: and respectively connecting the galvanic pile with a cell test board of the fuel cell, carrying out online loading variable current activation, and repeating the step S5 online for 1-2 times to complete online activation.
Compared with the prior art, the invention has the following advantages:
(1) the preactivation method provided by the invention is mainly based on the mechanisms of the pre-wetting of the membrane electrode of the galvanic pile, the optimization of the electrode structure, the effective construction of a three-phase interface and the like, and is realized by synchronously and circularly introducing high-pressure, high-humidity and high-temperature gas into a plurality of galvanic piles, no electrochemical reaction occurs in the preactivation process, no electronic load is needed, the gas is recycled and almost has no consumption, namely the gas consumption cost in the preactivation process is almost zero, and the galvanic piles after the preactivation are combined with simple variable current online activation, so that the overall activation efficiency of the galvanic piles can be further improved, the activation cost is reduced, and an important technical basis is provided for the batch production of the galvanic piles.
(2) The pre-activation device can simultaneously realize batch pre-treatment activation of a plurality of galvanic piles, has simple structure, easy operation, low cost and stronger practicability, and can effectively save production period, improve production efficiency within limited time and reduce activation cost of the galvanic piles especially for the pre-treatment activation of the large-power galvanic piles in batch production.
(3) Compared with the galvanic pile without pretreatment activation (comparative example), the initial performance of the galvanic pile after pretreatment activation according to the embodiment is obviously improved at the average voltage of the same electric density point, the time for the performance to reach the optimal stable value is also obviously shortened, the on-line activation time of a single galvanic pile is reduced by about 2 times, the hydrogen consumption of the total activation process of the single galvanic pile is reduced by about 3 times, and each device can pretreat and activate more than or equal to 20 galvanic piles (calculated according to the working time of 8 h) in one day according to the fuel cell pretreatment activation device designed according to the embodiment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a batch pre-activation apparatus for fuel cell stacks according to the present invention.
FIG. 2 shows the on-line activation process of the electric pile of the embodiment and the comparative example of the invention at 1200mA cm-2Is a graph of average voltage over time.
In the figure: 1. a hydrogen circulation system; 2. a coolant circulation system; 3. a nitrogen gas circulation system; 4. a control system; 5. and (4) an upper computer.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a batch pretreatment activation method of fuel cell stacks, which comprises the following steps:
step S1: and (4) carrying out air tightness detection on the initially-assembled and formed galvanic pile, and transferring the galvanic pile with the air tightness reaching the standard to a fuel cell galvanic pile pre-activation device. As shown in fig. 1, the present invention further includes a preactivation device, which mainly includes a hydrogen circulation system, a nitrogen circulation system, a cooling liquid circulation system, a control system, and an upper computer, wherein if there are a plurality of galvanic piles, the plurality of galvanic piles are connected in parallel, i.e., in a main-branch manner. For example, nitrogen gas from a gas source sequentially passes through a pressure reducing valve, a flow controller and a humidification tank along a main path, then is shunted to a branch of each electric pile, then enters the electric piles, finally is converged again at an outlet of the electric piles, and then flows back to the main path through a reflux pump for recycling. And each galvanic pile inlet pipeline is provided with a temperature sensor and a pressure sensor for detecting the temperature and the pressure of the gas entering the galvanic pile in real time. The pipeline settings of the hydrogen circulating system and the nitrogen circulating system are almost the same, and only the gas sources are different, and the pipe diameters are different. The cooling liquid circulation system circularly leads cooling liquid with certain temperature to the electric pile through the pre-activation device cooling liquid thermostat and the circulating pump.
In the present application, the hydrogen circulation system is provided with a pressure reducing valve, a humidifier, a proportional valve, a reflux pump, a flow meter, temperature and pressure sensors, and a rubber hose; the nitrogen circulating system is provided with a pressure reducing valve, a humidifier, a flow controller, a reflux pump, a flowmeter, temperature and pressure sensors and a rubber tube; the cooling liquid circulating system is provided with an external cooling liquid thermostat, a circulating pump, a pressure sensor and a temperature sensor arranged in the thermostat. The detailed connection is not described herein, and it is understood that in the present application, the hydrogen circulation system and the nitrogen circulation system are almost identical in arrangement, except that the introduced gas is different,
in the present embodiment, the control system includes: controlling a proportional valve, a humidifier, a reflux pump, a flow controller and a cooling liquid thermostat in the hydrogen, nitrogen and cooling liquid circulating system; the method specifically comprises the control of gas pressure, flow, humidification temperature, reflux pump rotating speed and cooling liquid temperature. The upper computer mainly sets parameters, and specifically comprises the settings of parameters such as gas pressure, flow, humidification temperature, reflux pump rotating speed and cooling liquid temperature. The upper computer is connected with the control system, and the control system is controlled by the transmission instruction to control the pre-activation device.
As a preferred embodiment, in the present application, the gas tightness detection of the stack comprises: and (3) performing leakage test of three cavities, namely hydrogen and the cavity flee for the cooling liquid cavity, and hydrogen and the cavity flee for each other and hydrogen single cavity leakage. The detailed description of the test method is omitted here, and it is understood that the airtightness needs to be detected by an effective means before step S2 is executed, and if the airtightness passes, the stack is transferred to the fuel cell stack pre-activation device. If the air tightness detection is not passed, the galvanic pile is repaired or returned to the previous production process, and it can be understood that if the galvanic pile with unqualified air tightness can not carry out any ventilation and test operation in the air tightness detection process of the first step.
Further step S2: in order to ensure that the galvanic pile is in a high-temperature and high-humidity state in the preactivation process of the battery and be beneficial to improving the activation efficiency of the battery, cooling liquid with certain temperature is continuously and circularly introduced into the galvanic pile to ensure that the temperature of the galvanic pile is increased and kept at the set temperature; the cooling liquid includes: deionized water and ethylene glycol based antifreeze; the temperature range of the cooling liquid is 60-80 ℃. Specifically, the set temperature is set according to the normal operation temperature of the fuel cell, and is generally 60-90 ℃. Further, step S3: setting the humidifying dew point temperature of nitrogen and hydrogen; the humidifying dew point temperature of the nitrogen and the hydrogen is more than or equal to the temperature of the cooling liquid introduced into the galvanic pile, so that the gas entering the galvanic pile is humidified to more than or equal to 100 percent; the humidifying dew point temperature of the nitrogen and the hydrogen is 60-85 ℃, and the wet dew point temperature is always kept to be not less than the circulating temperature of the cooling liquid.
Step S4: and introducing gas, and introducing nitrogen with a certain flow into the cathode of the galvanic pile, namely an air inlet when the humidifying dew point temperature of the gas reaches a set value. The preferable nitrogen flow is determined according to the number of the galvanic piles, the section number of the single galvanic pile and the effective area of a galvanic pile single cell, the metering ratio of the nitrogen flow to the galvanic pile during online operation is 2, and the working point is 300-500 mA/cm2The flow rate of air required for operation remains consistent. It is understood that in other embodiments, the specific setting of the flow rate of the nitrogen gas needs to be determined according to the number of the cell stacks, the number of the sections of the single cell stack and the effective area of the single cell stack under the actual working condition.
Adjusting a proportional valve, introducing hydrogen into the anode of the galvanic pile, namely a hydrogen inlet, and adjusting the pressure of the nitrogen and the hydrogen in the galvanic pile by adjusting a pressure reducing valve to ensure that the pressure of the hydrogen is always greater than the pressure of the nitrogen by 10-20 kPa; and continuously performing aeration and cooling liquid circulation for a time T1, and then intermittently performing a period of time T2 to perform 1-round pre-activation, circulating for 2-3 rounds, and completing the pre-activation. In this application, the circulation stop means stopping the intake air and the circulation of the cooling liquid, and allowing the battery to stand for a certain period of time; the specific standard for judging when the circulation stops is determined by judging the pre-activation effect through the initial performance during online activation, and multiple experiments show that the conventional cell stack can achieve the pre-activation purpose after 2-3 cycles of circulation, so 2-3 cycles of circulation are set in the application.
Preferably, in the present application, the main purpose of the intermittent cycle is to give the stack a time for self-internal regulation. The stacking pressure range of the set nitrogen and hydrogen is 100-200kPa, the pressure of the hydrogen is always greater than the pressure of the nitrogen by 10-20 kPa in the aeration process, the continuous aeration and cooling liquid circulation time T1 is 5-10 min, and the intermittent time T2 is 3-5 min.
Step S5: and respectively connecting the galvanic pile with a cell test board of the fuel cell, carrying out online loading variable current activation, and repeating the step S5 online for 1-2 times to complete online activation. In this application, the fuel cell testboard that adopts includes hydrogen circulation system, air circulation system, coolant liquid circulation system, electronic load, control system and host computer etc. mainly realizes online activation through loading the discharge operation to the pile.
Specifically, the on-line loading variable flow activation is carried out by loading to a first current density value at a certain loading rate, stably operating for a period of time T3, then loading to a second current density value at a certain loading rate, stably operating for a period of time T4, and then rapidly reducing the loading to 0mA/cm2And (5) stopping air intake and cooling liquid circulation, repeating the online activation process of the step (5) for 1-2 times, and completing online activation. In the activation process, a mass transfer channel in the battery is further opened mainly through on-line variable current activation, and the utilization rate of the catalyst is improved through electrochemical reaction. Because the galvanic pile is fully pretreated and activated before on-line loading and activation, the galvanic pile can reach the best performance only by simple variable current activation.
Specifically, the first current density value is set to be 500-800 mA/cm2The stable operation time T3 is 5-10 min; the second current density value is 1200-1600 mA/cm2The stable operation time T4 is 3-5 min.
Example 1
As an embodiment of the present application, a batch pre-treatment activation is performed on 4 newly assembled 370-segment metal plate bipolar plate fuel cell stacks by using the pre-activation device provided by the present application, and the specific steps are as follows:
(1) carry out the gas tightness to 4 fashioned fuel cell galvanic piles of treating activation of initial shipment earlier and detect, gas tightness detects and shifts the galvanic pile respectively to the fuel cell galvanic pile on activating device in advance after up to standard to the pipe, line connection are accurately carried out, specifically include gas transmission pipeline and coolant liquid transmission pipeline connection, the connection of temperature, pressure sensor circuit. Wherein, a nitrogen gas path of the activation device is connected with a galvanic pile cathode (air inlet) pipeline, a hydrogen gas path of the activation device is connected with a galvanic pile anode (hydrogen inlet) pipeline, a cooling liquid path of the device is connected with a galvanic pile cooling liquid inlet pipeline, and the inlet and the outlet of each galvanic pile three-cavity are respectively provided with a temperature sensor and a pressure sensor;
(2) introducing cooling liquid (deionized water), and continuously and circularly introducing deionized water at 70 ℃ into the galvanic pile to increase the temperature of the galvanic pile and keep the temperature at the set temperature;
(3) setting the dew point temperature of nitrogen humidification at 70 ℃ and the dew point temperature of hydrogen humidification at 75 ℃ to ensure that the gas entering the galvanic pile is humidified to be more than or equal to 100 percent;
(4) introducing gas, introducing nitrogen with a certain flow into a cathode (air inlet) of the galvanic pile when the humidifying dew point temperature of the gas reaches a set value, wherein the metering ratio of the nitrogen flow to the online running of the galvanic pile is 2, and the air flow required by the running of the galvanic pile at a working point of 500mA/cm2 is consistent; adjusting a proportional valve, introducing hydrogen into the anode (hydrogen inlet) of the galvanic pile, and adjusting the pressure reducing valve to adjust the pushing pressure of the nitrogen inlet to be 150kPa and the pressure of the hydrogen inlet to be 170 kPa; and continuously and circularly introducing deionized water for 8min, then intermittently (stopping introducing and introducing water) for 3min as 1-round pre-activation, and circulating for 2-3 rounds to finish the pre-activation. The main purpose of the intermittent cycle is to give the stack a time for self-internal regulation.
(5) And respectively connecting the galvanic pile with a fuel cell test bench to carry out online loading variable current activation. Specifically, the concentration of the active carbon is directly 50mA/cm2Loading rate of up to 800mA/cm2Value, steady operation for 10min at 50mA/cm2Loading rate of 1200mA/cm2The value is stable for 5min, and then the load is quickly reduced to 0mA/cm2And (5) stopping air inlet and cooling liquid circulation, and repeating the online activation process for 2 times to finish the activation. In the activation process, a mass transfer channel in the battery is further opened mainly through on-line variable current activation, and the utilization rate of the catalyst is improved through electrochemical reaction. Because the galvanic pile is fully pretreated and activated before on-line loading and activation, the galvanic pile can reach the best performance only by simple variable current activation.
As a comparative example of the present application,
the difference from the embodiment is that the electric pile is not activated by pretreatment, only the on-line activation is carried out by a fuel cell test bench, and the on-line activation method is the same as the embodiment except that the activation times are increased, and the activation time is increased.
Comparing the results of the on-line variable current activation of the galvanic pile of the examples and the comparative example, as shown in fig. 2, the on-line activation time of the galvanic pile of the examples is only about 48min to make the galvanic pile at 1200mA/cm due to the pretreatment activation2The average voltage of the working point reaches 0.685V, while the online activation process of the comparative example galvanic pile is 1200mA/cm2The average voltage of the working point is in a slow increasing trend, the average voltage of the galvanic pile reaches 0.683V after about 95min of activation, and the online activation efficiency of the galvanic pile after pretreatment and activation is fully proved to be remarkably improved, and the online activation time is reduced by about 2 times.
The total hydrogen consumption of the overall activation process of the examples and comparative examples is compared as shown in table 1. The hydrogen consumption in the activation process of the embodiment is reduced by about 3 times compared with that in the comparative example, the most main reason is that the gas is recycled in the pre-activation process on the premise of ensuring the activation effect, and almost no consumption exists.
According to the fuel cell batch pre-activation device designed according to the embodiment, the number of pre-activation electric piles of a single device per day is more than or equal to 20 (calculated according to 8h working time), so that the number of on-line activation electric piles of a single fuel cell test bench per day is more than or equal to 4 (calculated according to 8h working time), and the activation test efficiency is improved by 2 times compared with that of a comparative example.
TABLE 1
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A fuel cell stack batch pretreatment activation method is characterized by comprising the following steps:
s1: carrying out air tightness detection on the initially-assembled and formed galvanic pile, and transferring the galvanic pile with the air tightness reaching the standard to a fuel cell galvanic pile pre-activation device;
s2: introducing cooling liquid; continuously and circularly introducing cooling liquid with a certain temperature into the galvanic pile, keeping the flow fixed, and raising the temperature of the galvanic pile and keeping the temperature at a set temperature;
s3: setting the humidifying dew point temperature of nitrogen and hydrogen; the humidifying dew point temperature of the nitrogen and the hydrogen is more than or equal to the temperature of the cooling liquid introduced into the galvanic pile, so that the gas entering the galvanic pile is humidified by more than or equal to 100 percent;
s4: introducing gas, and introducing nitrogen with certain flow, pressure and temperature to a cathode of the electric pile, namely an air inlet when the humidifying dew point temperature of the gas reaches a set value;
adjusting a proportional valve to control the flow of gas, introducing hydrogen with certain flow, pressure and temperature to an anode of the galvanic pile, namely a hydrogen inlet, and adjusting the pile-entering pressure of the nitrogen and the hydrogen by adjusting a pressure reducing valve, wherein the pile-entering pressure range of the nitrogen and the hydrogen is 100-200kPa, and the pressure of the hydrogen is controlled to be always greater than the pressure of the nitrogen by 10-20 kPa; continuously performing aeration and cooling liquid circulation for a time T1, then intermittently performing for a period of time T2, performing 1-round pre-activation, circulating for 2-3 rounds, and completing the pre-activation;
s5: and respectively connecting the galvanic pile with a cell test board of the fuel cell, carrying out online loading variable current activation, and repeating the step S51-2 times to complete online activation.
2. The batch pre-processing activation method for fuel cell stacks according to claim 1, wherein the gas tightness detection of the stacks comprises: and (3) performing leakage test of three cavities, namely hydrogen and the cavity flee for the cooling liquid cavity, and hydrogen and the cavity flee for each other and hydrogen single cavity leakage.
3. The batch pre-treatment activation method for fuel cell stacks according to claim 1, wherein the cooling fluid comprises: deionized water and ethylene glycol based antifreeze; the temperature range of the cooling liquid is 60-80 ℃.
4. The batch pretreatment activation method for the fuel cell stacks as recited in claim 1, wherein the humidifying dew point temperature of the nitrogen and the hydrogen is 60-85 ℃, and the humidifying dew point temperature is always equal to or higher than the circulation temperature of the cooling liquid.
5. A fuel cell stack batch pre-processing activation apparatus to which the pre-processing activation method according to any one of claims 1 to 4 is applied, comprising: the system comprises a nitrogen circulating system, a hydrogen circulating system, a cooling liquid circulating system, a control system and an upper computer connected with the control system;
the hydrogen circulating system is provided with a pressure reducing valve, a humidifier, a proportional valve, a reflux pump, a flowmeter, temperature and pressure sensors and a rubber tube; the nitrogen circulating system is provided with a pressure reducing valve, a humidifier, a flow controller, a reflux pump, a flowmeter, temperature and pressure sensors and a rubber tube; the cooling liquid circulating system is provided with an external cooling liquid thermostat, a circulating pump, a pressure sensor and a temperature sensor arranged in the thermostat.
6. The fuel cell stack batch pre-processing activation device according to claim 5, wherein the control system comprises: controlling a proportional valve, a humidifier, a reflux pump, a flow controller and a cooling liquid thermostat in the hydrogen, nitrogen and cooling liquid circulating system; the method specifically comprises the control of gas pressure, flow, humidification temperature, reflux pump rotating speed and cooling liquid temperature.
7. The batch pre-treatment activation device for the fuel cell stacks as claimed in claim 5, wherein the upper computer is connected with the control system, and the control system is used for controlling the pre-activation device through transmission instructions.
8. The fuel cell stack batch pre-processing activation apparatus according to claim 5,
the nitrogen circuit of the device is connected with the cathode of the galvanic pile, namely a pipeline of an air inlet, the hydrogen circuit of the device is connected with the anode of the galvanic pile, namely a hydrogen inlet pipeline, the cooling liquid circuit of the device is connected with a cooling liquid inlet pipeline of the galvanic pile, and the inlet and the outlet of each galvanic pile three-cavity are respectively provided with a temperature sensor and a pressure sensor.
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| CN202111630383.7A CN114361530B (en) | 2021-12-28 | 2021-12-28 | Batch preactivation method and device for proton exchange membrane fuel cell stacks |
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| CN202111630383.7A CN114361530B (en) | 2021-12-28 | 2021-12-28 | Batch preactivation method and device for proton exchange membrane fuel cell stacks |
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| CN115036541A (en) * | 2022-06-27 | 2022-09-09 | 北京亿华通科技股份有限公司 | Durability control method and device for fuel cell stack |
| CN115064732A (en) * | 2022-07-25 | 2022-09-16 | 中汽创智科技有限公司 | Activation method of proton exchange membrane fuel cell |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114784330A (en) * | 2022-05-19 | 2022-07-22 | 上海捷氢科技股份有限公司 | Activation device for fuel cell system and delivery test method for fuel cell system |
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| CN115036541B (en) * | 2022-06-27 | 2023-09-22 | 北京亿华通科技股份有限公司 | Durability control method and device for fuel cell stack |
| CN115064732A (en) * | 2022-07-25 | 2022-09-16 | 中汽创智科技有限公司 | Activation method of proton exchange membrane fuel cell |
| CN115064732B (en) * | 2022-07-25 | 2024-02-23 | 中汽创智科技有限公司 | Activation method of proton exchange membrane fuel cell |
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