Fuel cell stack assembly method and device

Abstract

The present application relates to a fuel cell stack assembly method and device, which is applied to the field of fuel cell technology. The method includes: stacking the end plate, current collecting plate, bipolar plate and membrane electrode of the stack components in a stacking mechanism, applying pressure to the upper end plate; setting the pressing speed according to the pressure value; when the first target pressure value is reached, measuring the height of the stack and calculating the compression rate of the membrane electrode; if it is less than the first compression rate, increasing the pressure value to the second target pressure value, returning to measure the height of the stack; if it is greater than or equal to the first compression rate and less than the second compression rate, measuring the resistance value of the stack; if it is greater than or equal to the first resistance value, increasing the pressure value to the third target pressure value, returning to measure the height of the stack; if it is less than the first resistance value, determining that the stack assembly is completed; if it is greater than or equal to the second compression rate, measuring the resistance value of the stack; if it is greater than or equal to the second resistance value and less than the first resistance value, determining that the stack assembly is completed; otherwise determining that the stack assembly is unqualified. The qualified rate of the stack can be improved.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a fuel cell stack assembly method and device. Background Art

[0002] In the process of assembling hydrogen fuel cell stacks, a press is usually used to assemble the stacks, and the stacks are compressed by a fixed stack pressure. The eligibility of the assembly process is determined by determining the size of the stack pressure, and the assembly process of the stack is completed. However, during the stack assembly process, it is impossible to determine whether the membrane electrode is in a suitable compression state, it is impossible to judge the eligibility of the stack assembly state, and it is impossible to determine whether the stack assembly is qualified in time after the assembly is completed. In addition, there is a risk of bipolar plates being fractured. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a fuel cell stack assembly method, device, electronic device and storage medium.

[0004] According to a first aspect of the present application, a fuel cell stack assembly method is provided, comprising:

[0005] According to the stack structure, the stack components end plate, current collecting plate, bipolar plate, and membrane electrode are stacked in the stacking mechanism of the press, and pressure is applied to the upper end plate of the stack by the press;

[0006] According to the applied pressure value, the pressing speed of the press is set, wherein the pressing speed and the applied pressure value are inversely correlated;

[0007] When the applied pressure value reaches the first target pressure value, the pressing speed of the press is the first speed, and the core height is measured by the core height measurement sensor;

[0008] Calculate the compression rate of the membrane electrode according to the height of the core;

[0009] If the compression rate of the membrane electrode is less than the first compression rate, increasing the applied pressure value to a second target pressure value at a second speed, and returning to the step of measuring the height of the core by using the core height measurement sensor; wherein the second speed is less than the first speed;

[0010] If the compression rate of the membrane electrode is greater than or equal to the first compression rate and less than the second compression rate, measuring the resistance value of the stack by using a resistance measuring device;

[0011] If the resistance value is greater than or equal to the first resistance value, the applied pressure value is increased to a third target pressure value at a third speed, and the process returns to the step of measuring the height of the core by using the core height measurement sensor; wherein the third speed is less than the first speed;

[0012] If the resistance value is less than the first resistance value, it is determined that the battery stack is assembled;

[0013] If the compression rate of the membrane electrode is greater than or equal to the second compression rate, measuring the resistance value of the stack by using a resistance measuring device;

[0014] If the resistance value is greater than or equal to the second resistance value and less than the first resistance value, it is determined that the battery stack is assembled;

[0015] If the resistance value is less than the second resistance value or greater than or equal to the first resistance value, it is determined that the stacking is unqualified.

[0016] Optionally, setting the pressing speed of the press according to the applied pressure value includes:

[0017] When the applied pressure value is less than or equal to the first pressure value, the pressing speed of the press is set to V1;

[0018] When the applied pressure value is greater than the first pressure value and less than or equal to the second pressure value, the pressing speed of the press is set to V2;

[0019] When the applied pressure value is greater than the second pressure value and less than or equal to the third pressure value, the pressing speed of the press is set to V3;

[0020] When the applied pressure value is greater than the third pressure value and less than or equal to the first target pressure value, the pressing speed of the press is set to V4; wherein V4 is the first speed, V1> V2> V3> V4.

[0021] Optionally, calculating the compression rate of the membrane electrode according to the height of the core includes:

[0022] Assume that the core height is L1, and the theoretical height of the core in an unpressurized state is L2;

[0023] Then according to the formula: a=(L2-L1) / L2;

[0024] Calculate the compressibility a of the membrane electrode.

[0025] Optionally, the first compression ratio is 15% and the second compression ratio is 20%.

[0026] Optionally, the first pressure value is 5000N, the second pressure value is 10000N, and the third pressure value is 20000N;

[0027] V1 is 4mm / min, V2 is 3mm / min, V3 is 2mm / min, and V4 is 1mm / min.

[0028] According to a second aspect of the present application, a fuel cell stack assembly device is provided, comprising:

[0029] A pressure module is used to stack the end plates, current collecting plates, bipolar plates and membrane electrodes of the stack components in a stacking mechanism of a press according to the stack structure, and to apply pressure to the upper end plate of the stack through the press;

[0030] A pressing speed setting module, used to set the pressing speed of the press according to the applied pressure value, wherein the pressing speed and the applied pressure value are inversely correlated;

[0031] A core height measurement module, used for measuring the core height by using a core height measurement sensor when the applied pressure value reaches a first target pressure value and the pressing speed of the press is a first speed;

[0032] A compression rate calculation module is used to calculate the compression rate of the membrane electrode according to the height of the core;

[0033] a pressure increasing module, configured to increase the applied pressure value to a second target pressure value at a second speed if the compression rate of the membrane electrode is less than the first compression rate, and return to the core height measuring module to execute the step of measuring the core height by using the core height measuring sensor; wherein the second speed is less than the first speed;

[0034] A resistance value measuring module, used for measuring the resistance value of the stack using a resistance measuring device if the compression rate of the membrane electrode is greater than or equal to the first compression rate and less than the second compression rate;

[0035] The pressure increasing module is further configured to increase the applied pressure value to a third target pressure value at a third speed if the resistance value is greater than or equal to the first resistance value, and return to the core height measuring module to execute the step of measuring the core height by using the core height measuring sensor; wherein the third speed is less than the first speed;

[0036] A module for confirming that the battery stack is assembled is used to determine that the battery stack is assembled if the resistance value is less than the first resistance value;

[0037] The resistance value measuring module is further used to measure the resistance value of the stack using the resistance measuring device if the compression rate of the membrane electrode is greater than or equal to the second compression rate;

[0038] A module for confirming that the battery stack assembly is completed is used to determine that the battery stack assembly is completed if the resistance value is greater than or equal to the second resistance value and less than the first resistance value;

[0039] The module for confirming that the stacking is unqualified is used to determine that the stacking is unqualified if the resistance value is less than the second resistance value or greater than or equal to the first resistance value.

[0040] Optionally, the pressing speed setting module is specifically used to set the pressing speed of the press to V1 when the applied pressure value is less than or equal to the first pressure value; when the applied pressure value is greater than the first pressure value and less than or equal to the second pressure value, the pressing speed of the press is set to V2; when the applied pressure value is greater than the second pressure value and less than or equal to the third pressure value, the pressing speed of the press is set to V3; when the applied pressure value is greater than the third pressure value and less than or equal to the first target pressure value, the pressing speed of the press is set to V4; wherein V4 is the first speed, V1> V2> V3> V4.

[0041] Optionally, assuming that the height of the core is L1, and the theoretical height of the core in an unpressurized state is L2; ​​the compression rate calculation module is specifically used to calculate the compression rate a of the membrane electrode according to the formula: a=(L2-L1) / L2.

[0042] Optionally, the first compression ratio is 15% and the second compression ratio is 20%.

[0043] Optionally, the first pressure value is 5000N, the second pressure value is 10000N, and the third pressure value is 20000N;

[0044] V1 is 4mm / min, V2 is 3mm / min, V3 is 2mm / min, and V4 is 1mm / min.

[0045] According to a third aspect of the present application, an electronic device is provided, comprising: a processor, wherein the processor is configured to execute a computer program stored in a memory, wherein the computer program implements the method described in the first aspect when executed by the processor.

[0046] According to a fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method described in the first aspect is implemented.

[0047] According to a fifth aspect of the present application, a computer program product is provided. When the computer program product is run on a computer, the computer is enabled to execute the method described in the first aspect.

[0048] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0049] During the battery stack assembly process, different press speeds are set according to the pressure value applied by the press. As the pressure value increases, the press speed gradually decreases, which can effectively avoid the damage of the plates and membrane electrodes caused by the battery stack during the assembly process and improve the accuracy of the battery stack assembly. A resistance measuring device and a core height measuring sensor are added to the battery stack assembly press equipment. The core height is measured by the core height measuring sensor, and then the compression rate of the membrane electrode is calculated. Therefore, the compression state of the membrane electrode during the battery stack assembly process can be monitored in real time, and the rationality of its compression state can be judged. The resistance measuring device can monitor the resistance value of the battery stack during the battery stack assembly process in real time, and the resistance value can be used to judge whether the battery stack assembly is qualified. Bad battery stacks can be found in time during the assembly process, improving the qualified rate and production efficiency of the battery stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0052] Figure 1 A flow chart of a fuel cell stack assembly method in an embodiment of the present application;

[0053] Figure 2 It is a structural schematic diagram of a fuel cell stack assembly device in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0055] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0056] As a zero-emission energy conversion technology, hydrogen fuel cells can reduce dependence on fossil fuels and help slow global warming. In recent years, hydrogen fuel cell technology has made continuous breakthroughs, and these technological advances have made the application of hydrogen fuel cells in automobiles, stationary power generation, portable power sources and other fields more feasible.

[0057] As the core component of hydrogen fuel cells, the fuel cell stack is the place where hydrogen fuel cells generate electricity and plays a vital role in hydrogen fuel cells. During the production and manufacturing process of the fuel cell stack, its assembly process directly determines the performance of the fuel cell stack and its production qualification rate. Therefore, there are strict requirements for the production and assembly process of the fuel cell stack. Through advanced and efficient fuel cell stack assembly process and technology, the efficiency and qualification rate of fuel cell stack assembly can be effectively improved.

[0058] In the existing battery stack assembly process, it is still difficult to ensure the qualified rate of battery stack assembly, especially the control of the compression rate of the membrane electrode in the battery stack, which will directly affect the production efficiency of the battery stack. Therefore, it is necessary to improve the assembly process of the battery stack.

[0059] See also Figure 1 , Figure 1 This is a flow chart of a fuel cell stack assembly method in an embodiment of the present application, which may include the following steps:

[0060] Step S102, according to the structure of the battery stack, stack the battery stack components end plates, current collecting plates, bipolar plates, and membrane electrodes in a stacking mechanism of a press, and apply pressure to the upper end plate of the battery stack through the press.

[0061] Step S104, setting the press speed of the press according to the applied pressure value, wherein the press speed and the applied pressure value are inversely correlated.

[0062] In the embodiment of the present application, the pressure applied by the press to the upper end plate of the battery stack is continuously increased, and the pressing speed is gradually decreased as the pressure value increases. In this way, damage to the plates and membrane electrodes during the assembly process of the battery stack can be effectively avoided, thereby improving the accuracy of the battery stack assembly.

[0063] Optionally, when the applied pressure value is less than or equal to the first pressure value, the press speed of the press is set to V1; when the applied pressure value is greater than the first pressure value and less than or equal to the second pressure value, the press speed of the press is set to V2; when the applied pressure value is greater than the second pressure value and less than or equal to the third pressure value, the press speed of the press is set to V3; when the applied pressure value is greater than the third pressure value and less than or equal to the first target pressure value, the press speed of the press is set to V4; wherein V4 is the first speed, V1> V2> V3> V4. For example, the first pressure value is 5000N, the second pressure value is 10000N, and the third pressure value is 20000N; V1 is 4mm / min, V2 is 3mm / min, V3 is 2mm / min, and V4 is 1mm / min.

[0064] Step S106, determining whether the applied pressure value reaches a first target pressure value.

[0065] When the applied pressure value reaches the first target pressure value, the press speed of the press is the first speed, and step S108 is executed. When the applied pressure value does not reach the first target pressure value, the pressure continues to be applied.

[0066] Step S108, using a core height measurement sensor to measure the core height, and calculating the compression rate of the membrane electrode according to the core height.

[0067] When the pressure value reaches the first target pressure value, it indicates that the pressure value is relatively high. At this time, the compression state of the membrane electrode is monitored by measuring the height of the core and calculating the compression rate of the membrane electrode to determine the rationality of the compression state.

[0068] Optionally, assuming that the height of the core is L1 and the theoretical height of the core in an unpressurized state is L2, the compression rate a of the membrane electrode can be calculated according to the formula: a=(L2-L1) / L2.

[0069] Step S110, determining whether the compression rate of the membrane electrode is less than the first compression rate.

[0070] If the compression rate of the membrane electrode is less than the first compression rate, it means that the compression rate is still small, and step S112 is executed; if the compression rate of the membrane electrode is greater than or equal to the first compression rate, step S114 is executed. Optionally, the first compression rate is 15%.

[0071] Step S112, increasing the applied pressure value to a second target pressure value at a second speed, and returning to step S108; wherein the second speed is lower than the first speed.

[0072] In this step, the applied pressure value continues to increase, and when the second target pressure value is reached, the process returns to step S108 to recalculate the compression rate of the membrane electrode.

[0073] Step S114, determining whether the compression rate of the membrane electrode is less than the second compression rate.

[0074] If the compression rate of the membrane electrode is less than the second compression rate, step S116 is performed, and if the compression rate of the membrane electrode is greater than or equal to the second compression rate, step S124 is performed. Optionally, the second compression rate is 20%.

[0075] Step S116, using a resistance measuring device to measure the resistance value of the fuel cell stack.

[0076] By monitoring the resistance value of the battery stack during the battery stack assembly process, it can be determined whether the battery stack assembly is qualified.

[0077] Step S118, determining whether the resistance value is less than the first resistance value.

[0078] If the resistance value is greater than or equal to the first resistance value, it means that the resistance value of the battery stack is large and the battery stack assembly is unqualified, and step S120 is executed; if the resistance value is less than the first resistance value, it means that the resistance value of the battery stack meets the requirement and the battery stack assembly is qualified, and step S122 is executed.

[0079] Step S120, increasing the applied pressure value to a third target pressure value at a third speed, and returning to step S108; wherein the third speed is lower than the first speed.

[0080] Similarly, the applied pressure value continues to increase, and when the third target pressure value is reached, the process returns to step S108 to recalculate the compression rate of the membrane electrode.

[0081] Step S122, determining that the battery stack assembly is complete.

[0082] Step S124, using a resistance measuring device to measure the resistance value of the fuel cell stack.

[0083] When the compression rate of the membrane electrode is large, whether the stack assembly is qualified can be judged by monitoring the resistance value of the stack during the stack assembly process.

[0084] Step S126, determining whether the resistance value is greater than or equal to the second resistance value and less than the first resistance value.

[0085] If the resistance value is greater than or equal to the second resistance value and less than the first resistance value, step S122 is executed; if the resistance value is less than the second resistance value or greater than or equal to the first resistance value, step S128 is executed.

[0086] Since a large compression rate will affect the transmission of gas in the membrane electrode, in addition to the failure of the stack assembly when the resistance value is large, the stack assembly is also unqualified when the resistance value is small.

[0087] Step S128, determining that the stacking is unqualified.

[0088] The fuel cell stack assembly method of the embodiment of the present application sets different press speeds during the stack assembly process according to the pressure value applied by the press. As the pressure value increases, the press speed gradually decreases, thereby effectively avoiding the damage of the plates and membrane electrodes caused by the stack during the assembly process, and improving the accuracy of the stack assembly. A resistance measuring device and a core height measuring sensor are added to the stack assembly press equipment. The core height is measured by the core height measuring sensor, and then the compression rate of the membrane electrode is calculated. Therefore, the compression state of the membrane electrode during the stack assembly process can be monitored in real time, and the rationality of its compression state can be judged. The resistance value of the stack during the stack assembly process can be monitored in real time by the resistance measuring device, and whether the stack assembly is qualified can be judged by the resistance value. The bad stack during the assembly process can be found in time, and the qualified rate and production efficiency of the stack can be improved.

[0089] It should be noted that although the steps of the method in the present application are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0090] The present application also provides a fuel cell stack assembly device, see Figure 2 The fuel cell stack assembly device 200 comprises:

[0091] The pressure module 202 is used to stack the end plates, current collecting plates, bipolar plates and membrane electrodes of the stack components in a stacking mechanism of a press according to the stack structure, and to apply pressure to the upper end plate of the stack through the press;

[0092] A press speed setting module 204, used to set the press speed of the press according to the applied pressure value, wherein the press speed and the applied pressure value are inversely correlated;

[0093] A core height measurement module 206 is used to, when the applied pressure value reaches a first target pressure value, set the pressing speed of the press to a first speed, and use a core height measurement sensor to measure the height of the core;

[0094] A compression rate calculation module 208 is used to calculate the compression rate of the membrane electrode according to the height of the core;

[0095] The pressure increasing module 210 is used to increase the applied pressure value to a second target pressure value at a second speed if the compression rate of the membrane electrode is less than the first compression rate, and return to the core height measuring module 206 to perform the step of measuring the core height by using the core height measuring sensor; wherein the second speed is less than the first speed;

[0096] The resistance value measuring module 212 is used to measure the resistance value of the stack using a resistance measuring device if the compression rate of the membrane electrode is greater than or equal to the first compression rate and less than the second compression rate;

[0097] The pressure increasing module 210 is further configured to increase the applied pressure value to a third target pressure value at a third speed if the resistance value is greater than or equal to the first resistance value, and return to the core height measuring module to execute the step of measuring the core height by using the core height measuring sensor; wherein the third speed is less than the first speed;

[0098] A module 214 for confirming that the battery stack is assembled is completed, for determining that the battery stack is assembled if the resistance value is less than the first resistance value;

[0099] The resistance value measuring module 212 is further used to measure the resistance value of the stack using a resistance measuring device if the compression rate of the membrane electrode is greater than or equal to the second compression rate;

[0100] A module 214 for confirming that the battery stack assembly is completed is used to determine that the battery stack assembly is completed if the resistance value is greater than or equal to the second resistance value and less than the first resistance value;

[0101] The stacking failure confirmation module 216 is configured to determine that the stacking is unqualified if the resistance value is less than the second resistance value or greater than or equal to the first resistance value.

[0102] Optionally, the pressing speed setting module 204 is specifically used to set the pressing speed of the press to V1 when the applied pressure value is less than or equal to the first pressure value; when the applied pressure value is greater than the first pressure value and less than or equal to the second pressure value, the pressing speed of the press is set to V2; when the applied pressure value is greater than the second pressure value and less than or equal to the third pressure value, the pressing speed of the press is set to V3; when the applied pressure value is greater than the third pressure value and less than or equal to the first target pressure value, the pressing speed of the press is set to V4; wherein V4 is the first speed, V1> V2> V3> V4.

[0103] Optionally, assuming that the height of the core is L1, the theoretical height of the core in an unpressurized state is L2; ​​the compression rate calculation module 208 is specifically used to calculate the compression rate a of the membrane electrode according to the formula: a=(L2-L1) / L2.

[0104] Optionally, the first compression ratio is 15% and the second compression ratio is 20%.

[0105] Optionally, the first pressure value is 5000N, the second pressure value is 10000N, and the third pressure value is 20000N;

[0106] V1 is 4mm / min, V2 is 3mm / min, V3 is 2mm / min, and V4 is 1mm / min.

[0107] The specific details of each module or unit in the above device have been described in detail in the corresponding method, so they will not be repeated here.

[0108] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0109] An embodiment of the present application also provides an electronic device, comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to execute the above-mentioned fuel cell stack assembly method in this example embodiment.

[0110] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned fuel cell stack assembly method is implemented.

[0111] It should be noted that the computer-readable storage medium shown in the present application may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, radio frequency, etc., or any suitable combination of the above.

[0112] An embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, the computer executes the above-mentioned fuel cell stack assembly method.

[0113] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0114] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fuel cell stack assembly method, characterized in that: include: According to the stack structure, the stack components end plate, current collecting plate, bipolar plate, and membrane electrode are stacked in the stacking mechanism of the press, and pressure is applied to the upper end plate of the stack by the press; According to the applied pressure value, the pressing speed of the press is set, wherein the pressing speed and the applied pressure value are inversely correlated; When the applied pressure value reaches the first target pressure value, the pressing speed of the press is the first speed, and the core height is measured by the core height measurement sensor; Calculate the compression rate of the membrane electrode according to the height of the core; If the compression rate of the membrane electrode is less than the first compression rate, increasing the applied pressure value to a second target pressure value at a second speed, and returning to the step of measuring the height of the core by using the core height measurement sensor; wherein the second speed is less than the first speed; If the compression rate of the membrane electrode is greater than or equal to the first compression rate and less than the second compression rate, measuring the resistance value of the stack by using a resistance measuring device; If the resistance value is greater than or equal to the first resistance value, the applied pressure value is increased to a third target pressure value at a third speed, and the process returns to the step of measuring the height of the core by using the core height measurement sensor; wherein the third speed is less than the first speed; If the resistance value is less than the first resistance value, it is determined that the battery stack is assembled; If the compression rate of the membrane electrode is greater than or equal to the second compression rate, measuring the resistance value of the stack by using a resistance measuring device; If the resistance value is greater than or equal to the second resistance value and less than the first resistance value, it is determined that the battery stack is assembled; If the resistance value is less than the second resistance value or greater than or equal to the first resistance value, it is determined that the stacking is unqualified.

2. The method according to claim 1, characterized in that The step of setting the pressing speed of the press according to the applied pressure value comprises: When the applied pressure value is less than or equal to the first pressure value, the pressing speed of the press is set to V1; When the applied pressure value is greater than the first pressure value and less than or equal to the second pressure value, the pressing speed of the press is set to V2; When the applied pressure value is greater than the second pressure value and less than or equal to the third pressure value, the pressing speed of the press is set to V3; When the applied pressure value is greater than the third pressure value and less than or equal to the first target pressure value, the pressing speed of the press is set to V4; wherein V4 is the first speed, V1> V2> V3> V4.

3. The method according to claim 1, characterized in that The method of calculating the compression rate of the membrane electrode according to the height of the core includes: Assume that the core height is L1, and the theoretical height of the core in an unpressurized state is L2; Then according to the formula: a=(L2-L1) / L2; Calculate the compressibility a of the membrane electrode.

4. The method according to claim 1, characterized in that The first compression ratio is 15%, and the second compression ratio is 20%.

5. The method according to claim 2, characterized in that: The first pressure value is 5000N, the second pressure value is 10000N, and the third pressure value is 20000N; V1 is 4mm / min, V2 is 3mm / min, V3 is 2mm / min, and V4 is 1mm / min.

6. A fuel cell stack assembly device, characterized in that: The device comprises: A pressure module is used to stack the end plates, current collecting plates, bipolar plates and membrane electrodes of the stack components in a stacking mechanism of a press according to the stack structure, and to apply pressure to the upper end plate of the stack through the press; A pressing speed setting module, used to set the pressing speed of the press according to the applied pressure value, wherein the pressing speed and the applied pressure value are inversely correlated; A core height measurement module, used for measuring the core height by using a core height measurement sensor when the applied pressure value reaches a first target pressure value and the pressing speed of the press is a first speed; A compression rate calculation module is used to calculate the compression rate of the membrane electrode according to the height of the core; a pressure increasing module, configured to increase the applied pressure value to a second target pressure value at a second speed if the compression rate of the membrane electrode is less than the first compression rate, and return to the core height measuring module to execute the step of measuring the core height by using the core height measuring sensor; wherein the second speed is less than the first speed; A resistance value measuring module, used for measuring the resistance value of the stack using a resistance measuring device if the compression rate of the membrane electrode is greater than or equal to the first compression rate and less than the second compression rate; The pressure increasing module is further configured to increase the applied pressure value to a third target pressure value at a third speed if the resistance value is greater than or equal to the first resistance value, and return to the core height measuring module to execute the step of measuring the core height by using the core height measuring sensor; wherein the third speed is less than the first speed; A module for confirming that the battery stack is assembled is used to determine that the battery stack is assembled if the resistance value is less than the first resistance value; The resistance value measuring module is further used to measure the resistance value of the stack using the resistance measuring device if the compression rate of the membrane electrode is greater than or equal to the second compression rate; A module for confirming that the battery stack assembly is completed is used to determine that the battery stack assembly is completed if the resistance value is greater than or equal to the second resistance value and less than the first resistance value; The module for confirming that the stacking is unqualified is used to determine that the stacking is unqualified if the resistance value is less than the second resistance value or greater than or equal to the first resistance value.

7. The device according to claim 6, characterized in that The press speed setting module is specifically used to set the press speed of the press to V1 when the applied pressure value is less than or equal to the first pressure value; to set the press speed of the press to V2 when the applied pressure value is greater than the first pressure value and less than or equal to the second pressure value; to set the press speed of the press to V3 when the applied pressure value is greater than the second pressure value and less than or equal to the third pressure value; and to set the press speed of the press to V4 when the applied pressure value is greater than the third pressure value and less than or equal to the first target pressure value; wherein V4 is the first speed, V1> V2> V3> V4.

8. The device according to claim 6, characterized in that Assuming that the height of the core is L1, and the theoretical height of the core in an unpressurized state is L2; ​​the compression rate calculation module is specifically used to calculate the compression rate a of the membrane electrode according to the formula: a=(L2-L1) / L2.

9. The device according to claim 6, characterized in that The first compression ratio is 15%, and the second compression ratio is 20%.

10. The device according to claim 7, characterized in that The first pressure value is 5000N, the second pressure value is 10000N, and the third pressure value is 20000N; V1 is 4mm / min, V2 is 3mm / min, V3 is 2mm / min, and V4 is 1mm / min.

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