A method of activating a fuel cell stack
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FTXT ENERGY TECH CO LTD
- Filing Date
- 2025-02-06
- Publication Date
- 2026-08-07
AI Technical Summary
[0005]本发明的主要目的在于提供一种燃料电池电堆的活化方法，以解决目前燃料电池电堆的活化方法难以兼具活化效果好、效率高、安全性高、工艺简单、氢气消耗量大的问题
[0019]应用本发明的技术方案，先在低电位下对燃料电池电堆进行第一动电位循环，可以去除燃料电池电堆中的低价态金属氧化物、附着在电堆内的杂质，通过恒电位循环进行排水可以避免水淹，提高燃料电池的使用寿命以及安全性，通过在高电位下对燃料电池电堆进行第二动电位循环可以去除燃料电池电堆中的高价态金属氧化物，使燃料电池电堆得到充分的活化。本发明所述活化方法工艺简单，安全性高，氢气消耗量少，并且活化速率快，适合进行工业化应用。
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Abstract
Description
Technical Field
[0001] This invention relates to the field of fuel cell technology, and more specifically, to a method for activating a fuel cell stack. Background Technology
[0002] To effectively alleviate environmental and energy pressures, proton exchange membrane fuel cells (PEMFCs) have attracted much attention due to their high efficiency, cleanliness, and reliability. In particular, they have advantages in new energy vehicle applications, such as long driving range and short refueling time, making them comparable to gasoline vehicles.
[0003] Fuel cell performance is strongly correlated with the performance of the membrane electrode assembly (MEA) or the catalyst coating membrane (CCM). Therefore, it is crucial to quickly reach and utilize its inherent optimal performance, requiring periodic activation of the fuel cell to achieve its best performance point. An effective fuel cell activation scheme can not only maintain the optimal performance point of the stack, but also remove impurities and oxides inside the stack, thereby extending the life of the fuel cell.
[0004] Various activation methods for fuel cell stacks have been proposed and studied, such as current control, voltage control, hydrogen pumping, CO oxidation stripping, and electrochemical methods for membrane electrode assemblies (MEAs). However, these activation methods have mainly been validated on monolithic stacks or low-power stacks (e.g., less than 5 kW). Research reports on activation methods and processes for higher-power stacks used in engineering are very limited. It is worth noting that some methods employing harsh conditions for stack activation, such as high-temperature treatment of the MEA in boiling water or steam before stacking, or CO oxidation stripping, do not meet the safety requirements for industrial production. Furthermore, the reported activation methods also suffer from drawbacks such as complex processes, long activation times, and high hydrogen consumption. Therefore, in industrial production and practical battery applications, there is an urgent need to develop stack activation methods with short activation times, simple processes, mild conditions, and low hydrogen consumption. Summary of the Invention
[0005] The main objective of this invention is to provide an activation method for fuel cell stacks, thereby solving the problem that current activation methods for fuel cell stacks are difficult to achieve simultaneously good activation effect, high efficiency, high safety, simple process, and high hydrogen consumption.
[0006] To achieve the above objectives, according to one aspect of the present invention, a method for activating a fuel cell stack is provided, comprising the following steps:
[0007] S1, Perform the first potentiodynamic cycle on the fuel cell stack to obtain the first pre-activated stack;
[0008] S2, perform constant potential cycling on the first pre-activated stack to obtain the second pre-activated stack;
[0009] S3, perform a second potentiodynamic cycle on the second pre-activated stack to complete the activation;
[0010] Specifically, the first potentiodynamic cycle controls the voltage of a single battery cell to cycle within the range of 0.1V to 0.7V; the second potentiodynamic cycle controls the voltage of a single battery cell to cycle within the range of 0.7V to 0.9V; and the constant potential cycle controls the voltage of a single battery cell to cycle within the range of 0.65V to 0.75V.
[0011] Furthermore, in S1, during the first potentiodynamic cycle, the current density point is maintained for 3 to 5 minutes, and the cycle is repeated 3 to 10 times.
[0012] Furthermore, in S1, the interval between adjacent current density points is 0.05 A / cm. 2 ~0.2A / cm 2 .
[0013] Furthermore, in S2, during the constant potential cycle, the constant potential is maintained for 0.5 min to 1.5 min, and the cycle is repeated 1 to 3 times, with water drained after each cycle.
[0014] Furthermore, in S3, during the second potentiodynamic cycle, the current density point is maintained for 4 to 6 minutes, and the cycle is repeated 3 to 5 times.
[0015] Furthermore, in S3, the interval between adjacent current density points is 0.05 A / cm. 2 ~0.2A / cm 2 .
[0016] Furthermore, the first potentiodynamic cycle, the constant potential cycle, and the second potentiodynamic cycle are each carried out independently at 60℃~80℃.
[0017] Further, before S1, inert gas is introduced into the fuel cell stack.
[0018] Furthermore, the inert gas includes at least one of nitrogen, argon, and helium.
[0019] By applying the technical solution of this invention, a first potentiodynamic cycle is performed on the fuel cell stack at a low potential to remove low-valence metal oxides and impurities adhering to the stack. Drainage via constant potential cycling prevents flooding, improving the fuel cell's lifespan and safety. A second potentiodynamic cycle is then performed on the fuel cell stack at a high potential to remove high-valence metal oxides, thus fully activating the fuel cell stack. The activation method described in this invention is simple, safe, consumes little hydrogen, and has a fast activation rate, making it suitable for industrial applications. Attached Figure Description
[0020] Figure 1 The graphs show the electrochemical performance of the fuel cell stack before and after activation in Example 1. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.
[0022] As described in the background section of this invention, existing technologies suffer from problems such as low safety, long activation time, high hydrogen consumption, and complex processes in fuel cell stack activation methods. To address these technical problems, in a typical embodiment of this invention, a fuel cell stack activation method is provided, comprising the following steps:
[0023] S1, Perform the first potentiodynamic cycle on the fuel cell stack to obtain the first pre-activated stack;
[0024] S2, perform constant potential cycling on the first pre-activated stack to obtain the second pre-activated stack;
[0025] S3, perform a second potentiodynamic cycle on the second pre-activated stack to complete the activation;
[0026] Specifically, the first potentiodynamic cycle controls the voltage of a single battery cell to cycle within the range of 0.1V to 0.7V; the second potentiodynamic cycle controls the voltage of a single battery cell to cycle within the range of 0.7V to 0.9V; and the constant potential cycle controls the voltage of a single battery cell to cycle within the range of 0.65V to 0.75V, such as 0.65V, 0.7V, 0.75V, etc., or other values within this range, without any special limitation.
[0027] In the technical solution of this application embodiment, the first potentiodynamic cycle helps to initially activate the fuel cell stack. By cycling within a lower voltage range, impurities and contaminants inside the fuel cell stack can be effectively removed, as well as low-valence metal oxides, laying the foundation for subsequent activation steps. The constant potential cycle further optimizes the internal structure of the fuel cell stack, improving its stability and consistency. The final second potentiodynamic cycle is performed within a higher voltage range, aiming to remove high-valence metal oxides from the fuel cell stack, fully activating its electrochemical activity and improving the overall output performance of the fuel cell stack.
[0028] In some embodiments, during the first potentiodynamic cycle in S1, the current density point is maintained for 3 to 5 minutes, such as 3 minutes, 4 minutes, 5 minutes, etc., or other values within this range, without special limitation. The cycle is repeated 3 to 10 times, such as 3 times, 4 times, 6 times, 10 times, etc., or other values within this range, without special limitation.
[0029] Controlling the conditions of the first potentiodynamic cycle helps remove the oxide layer on the catalyst surface, improves battery efficiency, and restores catalyst activity. It also helps regulate the humidity inside the membrane electrode, improving proton conductivity. Furthermore, the efficiency of the first potentiodynamic cycle is higher under the above conditions, which can increase the activation rate.
[0030] Typically, but not limitingly, in S1, the interval between adjacent current density points is 0.05 A / cm. 2 ~0.2A / cm 2 For example, 0.05A / cm 2 0.1A / cm 2 0.2A / cm 2 "etc." can also be other values within this range, without special restrictions here.
[0031] By controlling the interval between current density points within the above range, impurities can be effectively removed, and activation efficiency can be guaranteed.
[0032] In some embodiments, during the constant potential cycle in S2, the constant potential is maintained for 0.5 min to 1.5 min, such as 0.5 min, 1 min, 1.5 min, etc., or other values within this range, without special limitation. The cycle is repeated 1 to 3 times, such as 1 time, 2 times, 3 times, etc., or other values within this range, without special limitation. Drainage is carried out after each cycle.
[0033] Under the above conditions, constant potential cycling can continue to remove the oxide layer on the catalyst surface, and can also prevent catalyst agglomeration or performance degradation. This helps to control the moisture balance inside the stack, ensure that the membrane electrode operates under optimal humidity, and improve the conduction efficiency of the proton exchange membrane. At the same time, it can also reduce hydrogen consumption.
[0034] In some embodiments, during the second potentiodynamic cycle in S3, the current density point is maintained for 4 to 6 minutes, such as 4 minutes, 5 minutes, 6 minutes, etc., or other values within this range, without special limitation. The cycle is repeated 3 to 5 times, such as 3 times, 4 times, 5 times, etc., or other values within this range, without special limitation.
[0035] The second potentiodynamic cycle further activates the catalyst surface. Holding each current density point for 4–6 minutes ensures sufficient time for the electrochemical reaction to proceed, thereby more thoroughly activating the active sites on the catalyst surface. This contributes to deeper catalyst activation and extends battery life.
[0036] Typically, but not limitingly, in S3, the interval between adjacent current density points is 0.05 A / cm. 2 ~0.2A / cm 2 For example, 0.05A / cm 2 0.1A / cm 2 0.2A / cm 2 "etc." can also be other values within this range, without special restrictions here.
[0037] In some embodiments, the first potentiodynamic cycle, the constant potential cycle, and the second potentiodynamic cycle are each performed independently at 60°C to 80°C. Specifically, such as 60°C, 70°C, 80°C, etc., or other values within this range, are not specifically limited here.
[0038] By controlling the temperature during the activation process, it is beneficial to improve the activation efficiency and activation depth, so that the activated fuel cell has good electrochemical activity.
[0039] In this application, the potential is controlled by controlling the current density during the first potential dynamometer cycle, the constant potential cycle, and the second potential dynamometer cycle.
[0040] In some embodiments, prior to S1, an inert gas is introduced into the fuel cell stack. Typically, but not limitingly, the inert gas includes at least one of nitrogen, argon, and helium.
[0041] Introducing inert gas can remove impurities from the fuel cell stack, prevent oxidation during activation, and protect the stack's structural integrity and electrochemical performance.
[0042] In some embodiments, during the first potentiodynamic cycle, the constant potential cycle, and the second potentiodynamic cycle, hydrogen is continuously introduced into the anode and oxygen or air is continuously introduced into the cathode.
[0043] By continuously introducing hydrogen, oxygen, or air during the activation process, the electrochemical reaction can be promoted, the catalyst can be deeply activated, and the activation effect can be improved.
[0044] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.
[0045] In the examples and comparative examples, the unactivated fuel cell stack consisted of 489 stacks (Weisheng Energy Gen 2 / 120kW stack).
[0046] Example 1
[0047] An embodiment of the activation method for the fuel cell stack of the present invention includes the following steps:
[0048] S1, Nitrogen gas is introduced into the unactivated fuel cell stack for 240 seconds to remove impurity gases;
[0049] S2, the fuel cell stack undergoes its first potentiodynamic cycle at 1.0 A / cm. 2 ~2.2A / cm 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.1V to 0.7V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 3 minutes, and the cycle was repeated 5 times to obtain the first pre-activated stack. The stack temperature was maintained at 70°C during the first potential kinetic cycle.
[0050] S3, perform constant potential cycling on the first pre-activated stack at 1.0 A / cm 2 Under current density conditions, i.e., single cell potential of 0.7V, constant potential operation for 1 minute, power off and water drained, cycled 3 times to obtain the second pre-activated stack. The stack temperature was maintained at 70℃ during the constant potential cycle.
[0051] S4, perform a second potentiodynamic cycle on the second pre-activated stack at 0–1.0 A / cm. 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.7V to 0.9V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 5 minutes, and the cycle was repeated 4 times to complete the activation. During the second potential kinetic cycle, the stack temperature was maintained at 70°C.
[0052] During the first potentiodynamic cycle, the constant potential cycle, and the second potentiodynamic cycle, hydrogen gas is introduced at the anode and oxygen gas is introduced at the cathode. The hydrogen consumption during the first potentiodynamic cycle, the second potentiodynamic cycle, and the constant potential cycle is 300L, 30L, and 56L, respectively.
[0053] Example 2
[0054] An embodiment of the activation method for the fuel cell stack of the present invention includes the following steps:
[0055] S1, Nitrogen gas is introduced into the unactivated fuel cell stack for 240 seconds to remove impurity gases;
[0056] S2, the fuel cell stack undergoes its first potentiodynamic cycle at 1.0 A / cm. 2 ~2.2A / cm 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.1V to 0.7V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 5 minutes, and the cycle was repeated 3 times to obtain the first pre-activated stack. The stack temperature was maintained at 60°C during the first potential kinetic cycle.
[0057] S3, perform constant potential cycling on the first pre-activated stack at 1.0 A / cm 2 Under current density conditions, i.e., single cell potential of 0.7V, constant potential operation for 1 minute, power off and water drained, cycled 3 times to obtain the second pre-activated stack. The stack temperature was maintained at 70℃ during the constant potential cycle.
[0058] S4, perform a second potentiodynamic cycle on the second pre-activated stack at 0–1.0 A / cm. 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.7V to 0.9V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 6 minutes, and the cycle was repeated 3 times to complete the activation. During the second potential kinetic cycle, the stack temperature was maintained at 70°C.
[0059] During the first potentiodynamic cycle, the constant potential cycle, and the second potentiodynamic cycle, hydrogen gas is introduced into the anode and oxygen gas is introduced into the cathode.
[0060] Example 3
[0061] An embodiment of the activation method for the fuel cell stack of the present invention includes the following steps:
[0062] S1, Nitrogen gas is introduced into the unactivated fuel cell stack for 240 seconds to remove impurity gases;
[0063] S2, the fuel cell stack undergoes its first potentiodynamic cycle at 1.0 A / cm. 2 ~2.2A / cm 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.1V to 0.7V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 4 minutes, and the cycle was repeated 6 times to obtain the first pre-activated stack. The stack temperature was maintained at 75°C during the first potential kinetic cycle.
[0064] S3, perform constant potential cycling on the first pre-activated stack at 1.0 A / cm 2 Under current density conditions, i.e., a single cell potential of 0.7V, the battery was kept at a constant potential for 1.5 minutes, then power was cut off and water was drained. This cycle was repeated twice to obtain the second pre-activated battery stack. The battery stack temperature was maintained at 75℃ during the constant potential cycle.
[0065] S4, perform a second potentiodynamic cycle on the second pre-activated stack at 0–1.0 A / cm. 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.7V to 0.9V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point lasts for 4 minutes, and the cycle is repeated 5 times to complete the activation. During the second potential kinetic cycle, the stack temperature is maintained at 75°C.
[0066] During the first potentiodynamic cycle, the constant potential cycle, and the second potentiodynamic cycle, hydrogen gas is introduced into the anode and oxygen gas is introduced into the cathode.
[0067] Example 4
[0068] An embodiment of the activation method for the fuel cell stack of the present invention includes the following steps:
[0069] S1, Nitrogen gas is introduced into the unactivated fuel cell stack for 240 seconds to remove impurity gases;
[0070] S2, the fuel cell stack undergoes its first potentiodynamic cycle at 1.0 A / cm. 2 ~2.2A / cm 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.1V to 0.7V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 3 minutes, and the cycle was repeated 15 times to obtain the first pre-activated stack. The stack temperature was maintained at 70°C during the first potential kinetic cycle.
[0071] S3, perform constant potential cycling on the first pre-activated stack at 1.0 A / cm 2 Under current density conditions, i.e., single cell potential of 0.7V, constant potential operation for 1 minute, power off and water drained, cycled 3 times to obtain the second pre-activated stack. The stack temperature was maintained at 70℃ during the constant potential cycle.
[0072] S4, perform a second potentiodynamic cycle on the second pre-activated stack at 0–1.0 A / cm. 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.7V to 0.9V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 5 minutes, and the cycle was repeated 6 times to complete the activation. During the second potential kinetic cycle, the stack temperature was maintained at 70°C.
[0073] During the first potentiodynamic cycle, the constant potential cycle, and the second potentiodynamic cycle, hydrogen gas is introduced into the anode and oxygen gas is introduced into the cathode.
[0074] Comparative Example 1
[0075] An activation method for a fuel cell stack includes the following steps:
[0076] S1, Nitrogen gas is introduced into the unactivated fuel cell stack for 240 seconds to remove impurity gases;
[0077] S2, the fuel cell stack undergoes its first potentiodynamic cycle at 1.0 A / cm. 2 ~2.2A / cm 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.1V to 0.7V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 3 minutes, and the cycle was repeated 5 times to obtain the first pre-activated stack. The stack temperature was maintained at 70°C during the first potential kinetic cycle.
[0078] S3, perform a second potentiodynamic cycle on the first pre-activated stack at 0–1.0 A / cm. 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.7V to 0.9V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 5 minutes, and the cycle was repeated 4 times to complete the activation. During the second potential kinetic cycle, the stack temperature was maintained at 70°C.
[0079] During the first and second potential kinetic cycles, hydrogen is introduced into the anode and oxygen is introduced into the cathode. Since there is no constant potential cycle in this example, more hydrogen is needed to remove impurities and meet the current balance during the second potential kinetic cycle activation. In this activation method, the hydrogen consumption during the first and second potential kinetic cycles is 300L and 112L, respectively.
[0080] Comparative Example 2
[0081] An activation method for a fuel cell stack includes the following steps:
[0082] S1, Nitrogen gas is introduced into the unactivated fuel cell stack for 240 seconds to remove impurity gases;
[0083] S2, perform potentiodynamic cycling on the fuel cell stack at 0 A / cm 2 ~2.2A / cm 2 Potential dynamics cycling is performed within the current density range to ensure that the voltage of a single cell cycles within the range of 0.1V to 0.9V, with an interval of 0.1A / cm between adjacent current density points. 2 Each current density point was maintained for 5 minutes, and the cycle was repeated 10 times to complete the activation. During the activation process, the stack temperature was maintained at 70°C. Hydrogen gas was introduced at the anode and oxygen gas was introduced at the cathode. The hydrogen consumption of this activation method was 486 L.
[0084] Performance testing.
[0085] The electrochemical performance of the activated fuel cell stacks in the examples and comparative examples was tested. The test methods are as follows, and the test results are shown in Table 1.
[0086] Test Method: Durability testing was conducted according to GB / T 38914-2020 "Test and Evaluation Method for Service Life and Durability of Proton Exchange Membrane Fuel Cell Stacks for Vehicles". After the tested fuel cell stack was assembled, a normal airtightness test was performed. After meeting the national airtightness standard GB / T 24554-2022 "Safety Requirements for Fuel Cell Stacks of Fuel Cell Electric Vehicles", the stack was connected to the test bench for IV performance testing, and the initial performance data was recorded. The fuel cell stack was activated using the methods in the examples and comparative examples. After activation, IV testing was performed again, and the data was recorded. The changes in the IV curves before and after activation were compared. The test results are shown in the table below.
[0087] Table 1
[0088]
[0089]
[0090] Figure 1The graphs show the electrochemical performance of the fuel cell stack before and after activation in Example 1. As can be seen from the graphs, the activity of the fuel cell stack is significantly improved after activation.
[0091] Comparing the performance test results of Example 1 and Comparative Example 1, it can be found that after activation by sequentially using the first potentiodynamic cycle, constant potential cycle and second potentiodynamic cycle methods of the present invention, the stack exhibits good electrochemical activity at different current densities; if the constant potential cycle step is omitted, its electrochemical activity under high current density conditions will be significantly reduced.
[0092] Comparing the performance test results of Example 1 and Comparative Example 2, it can be found that although both underwent potentiodynamic cycling, Comparative Example 2 was not activated in steps and was not subjected to constant potential cycling. Its electrochemical activity was significantly lower, and under high current density conditions, its electrochemical activity was the same as that of the unactivated stack.
[0093] Furthermore, comparing the test data of Example 1 and Comparative Examples 1-2, it can be seen that the hydrogen consumption is lower when activated using the method described in this invention.
[0094] In addition, comparing the test results of Examples 1 to 4, it can be found that when the number of the first potentiodynamic cycle is 3 to 10, the number of constant potential cycles is 1 to 3, and the number of the second potentiodynamic cycle is 3 to 5, the current density is 0 to 1.6 A / cm². 2 Under the given conditions, the fuel cell stacks exhibit good electrochemical activity, with significantly higher electrochemical activity at low current densities.
[0095] As can be seen from the above test results, the electrochemical activity of the fuel cell stack is significantly higher after activation using the activation method in the embodiments of this application. That is, the method described in this application can achieve deep activation of the fuel cell stack. Furthermore, the activation time of the method described in this application is short, the hydrogen consumption is low, the efficiency is high, it does not require treatment in high-temperature environments such as boiling water or steam, it has good safety, the process is simple, and it is suitable for industrial application.
[0096] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for activating a fuel cell stack, characterized in that, Includes the following steps: S1, Perform the first potentiodynamic cycle on the fuel cell stack to obtain the first pre-activated stack; S2, perform constant potential cycling on the first pre-activated stack to obtain the second pre-activated stack; S3, perform a second potentiodynamic cycle on the second pre-activated stack to complete the activation; Specifically, the first potentiodynamic cycle controls the voltage of a single battery cell to cycle within the range of 0.1V to 0.7V; the second potentiodynamic cycle controls the voltage of a single battery cell to cycle within the range of 0.7V to 0.9V; and the constant potential cycle controls the voltage of a single battery cell to cycle within the range of 0.65V to 0.75V.
2. The activation method for a fuel cell stack according to claim 1, characterized in that, In S1, during the first potentiodynamic cycle, the current density point is maintained for 3 to 5 minutes, and the cycle is repeated 3 to 10 times.
3. The activation method for a fuel cell stack according to claim 1 or 2, characterized in that, In S1, the interval between adjacent current density points is 0.05 A / cm. 2 ~0.2A / cm 2 .
4. The activation method for a fuel cell stack according to claim 1 or 2, characterized in that, In S2, during the constant potential cycle, the constant potential is maintained for 0.5 min to 1.5 min, and the cycle is repeated 1 to 3 times. After each cycle, water is drained.
5. The activation method for a fuel cell stack according to claim 1 or 2, characterized in that, In S3, during the second potentiodynamic cycle, the cycle lasts for 4 to 6 minutes at each current density point, and is repeated 3 to 5 times.
6. The activation method for a fuel cell stack according to claim 5, characterized in that, In step S3, the interval between adjacent current density points is 0.05 A / cm. 2 ~0.2A / cm 2 .
7. The activation method for a fuel cell stack according to claim 1 or 2, characterized in that, The first potentiodynamic cycle, the constant potential cycle, and the second potentiodynamic cycle are each performed independently at 60°C to 80°C.
8. The activation method for a fuel cell stack according to claim 1 or 2, characterized in that, Before step S1, an inert gas is introduced into the fuel cell stack.
9. The activation method for a fuel cell stack according to claim 8, characterized in that, The inert gas includes at least one of nitrogen, argon, and helium.