A fuel cell stack optimization method, device, electronic equipment and medium

Abstract

The present invention discloses an optimization method, device, electronic device and medium for a fuel cell stack, wherein the fuel cell stack includes a plurality of target tie rods and an end plate connected to the plurality of target tie rods, wherein the plurality of target tie rods are not located in the central area of ​​the length direction of the fuel cell stack, and the method includes: determining the initial positions of the plurality of target tie rods based on the structure of the bipolar plate in the fuel cell stack; moving the positions of the plurality of target tie rods, and simulating the end plate after the position of the tie rods is changed; determining the optimal design positions of the plurality of target tie rods based on the deformation of the end plate obtained by the simulation, so that the deformation of the end plate is minimized; optimizing the design of the fuel cell stack based on the optimal design positions of the plurality of target tie rods. The present application controls the deformation of the end plate by changing the position of the tie rods, thereby effectively improving the uniformity of the internal pressure of the stack, which is beneficial to improving the electric propulsion performance.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell production and processing, and in particular to a fuel cell stack optimization method, device, electronic equipment and medium. Background Art

[0002] With the continuous development of industrial society, people are paying more and more attention to environmental pollution and energy depletion. Proton exchange membrane fuel cell (PEMFC) has the advantages of high conversion efficiency, no environmental pollution, low operating temperature, fast start-up, etc. It is a kind of automotive power source with broad application prospects. However, the output voltage of a single cell is relatively small. In practical applications, many single cells are assembled in series, end plates are installed on both sides of the stack, and fasteners such as bolts or steel strips are used to press the various structural components together. The packaging force generated by the fasteners squeezes the components of the stack against each other, forms a suitable contact pressure on the membrane electrode, and forms a good sealing effect together with the seal.

[0003] Since the end plate of the stack is not an ideal absolutely rigid material, under a certain packaging load, the end plate will bend and deform, thus affecting the uniformity of the pressure distribution on the internal contact interface. The uneven pressure acting on the membrane electrode will have an adverse effect on the normal operation of the stack: too little force can easily lead to a sharp increase in local contact resistance, hindering the transmission of current, causing excessive ohmic losses in electrochemical performance, and also reducing the sealing effect of the stack; too much force will cause part of the gas diffusion layer to be over-compressed, reducing the porosity, thereby increasing the gas transmission impedance, both of which will affect the overall working performance of the stack. Therefore, the uniform distribution of pressure inside the stack is crucial to the electrochemical performance of the fuel cell.

[0004] Prior art CN202122536539.7 proposes a fuel cell end plate with a honeycomb structure, which aims to solve the problem that the existing end plate has low strength, low rigidity, and uneven stress distribution, resulting in uneven contact pressure distribution of components inside the stack, which has an adverse effect on the performance and life of the fuel cell stack. However, the processing of the end plate is relatively complicated, which will increase the cost of the stack, and compared with the complete cube result, the honeycomb structure reduces the end plate material, which will lead to a decrease in rigidity and increase in end plate deformation. Summary of the invention

[0005] The embodiments of the present application provide a fuel cell stack optimization method, device, electronic equipment and medium. By changing the position of the pull rod and controlling the deformation of the end plate, the uniformity of the internal pressure of the stack can be effectively improved, which is beneficial to improving the electric propulsion performance.

[0006] In a first aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0007] A method for optimizing a fuel cell stack, the fuel cell stack comprising a plurality of target tie rods and end plates connected to the plurality of target tie rods, wherein the plurality of target tie rods are not located in the central area in the length direction of the fuel cell stack, the method comprising: determining the initial positions of the plurality of target tie rods based on the structure of the bipolar plates in the fuel cell stack; moving the positions of the plurality of target tie rods and simulating the end plates after the positions of the tie rods are changed; determining the optimal design positions of the plurality of target tie rods based on the deformation of the end plates obtained by simulation, so as to minimize the deformation of the end plates; and optimizing the design of the fuel cell stack based on the optimal design positions of the plurality of target tie rods.

[0008] Preferably, determining the optimal design positions of the multiple target tie rods based on the deformation of the end plate obtained by simulation includes: determining the optimal design positions of the multiple target tie rods based on the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation.

[0009] Preferably, the optimal design positions of the multiple target rods are determined based on the difference between the maximum deformation and the minimum deformation of the end plate obtained based on the simulation, including: if the difference between the maximum deformation and the minimum deformation of the end plate obtained based on the simulation is less than or equal to 0.3 mm, then the current positions of the multiple target rods are determined to be the optimal design positions.

[0010] Preferably, determining the optimal design position of the pull rod based on the deformation of the end plate obtained by simulation includes: determining the optimal design position of the pull rod based on the ratio of the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation to the maximum deformation.

[0011] Preferably, before moving the positions of the plurality of target tie rods, the method further comprises: determining the maximum displacement of the plurality of target tie rods according to the initial positions of the plurality of target tie rods and the length of the end plate of the fuel cell stack.

[0012] Preferably, the ratio of the maximum displacement to the length of the end plate is between 5% and 18%.

[0013] Preferably, the ratio of the maximum displacement to the length of the end plate is 5.68%.

[0014] Preferably, if the maximum displacements of the multiple target rods are equal, the positions of the multiple rods are moved and the end plates after the positions of the rods are changed are simulated, including: for each target rod, the rod is moved from the initial position to the middle area of ​​the end plate by a preset displacement unit amount, and the end plate is simulated after each movement of the rod until the movement distance of the rod reaches the maximum displacement, wherein the maximum displacement is an integer multiple of the preset displacement unit amount.

[0015] Preferably, the ratio of the preset displacement unit to the length of the end plate is between 0.237% and 2.27%.

[0016] Preferably, the ratio of the preset displacement unit to the length of the end plate is 1.14%.

[0017] Preferably, moving the positions of the multiple target rods and simulating the end plate after the positions of the rods are changed includes: moving the two end rods of the multiple target rods toward the middle by a first preset displacement unit amount, moving the remaining rods of the multiple target rods toward the middle by a second preset displacement unit amount, and simulating the end plate after the positions of the rods are changed, wherein the first preset displacement unit amount is smaller than the second preset displacement unit amount.

[0018] In a second aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0019] A fuel cell stack optimization device, comprising:

[0020] An initial position determination module, used to determine the initial positions of a plurality of target tie rods based on the structure of the bipolar plates in the fuel cell stack;

[0021] A simulation module, used for moving the positions of the plurality of target tie rods and simulating the end plate after the positions of the tie rods are changed;

[0022] A tie rod position determination module, used to determine the optimal design positions of the plurality of target tie rods based on the deformation of the end plate obtained by simulation, so as to minimize the deformation of the end plate;

[0023] The design module is used to optimize the design of the fuel cell stack based on the optimal design positions of the multiple target tie rods.

[0024] Preferably, the tie rod position determination module comprises: a tie rod position determination submodule, which is specifically used to determine the optimal design positions of the plurality of target tie rods based on the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation.

[0025] In a third aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0026] An electronic device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any one of the methods described in the first aspect are implemented.

[0027] In a fourth aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0028] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0029] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0030] The optimization method of the fuel cell stack provided in the embodiment of the present invention first determines the initial positions of multiple target tie rods based on the structure of the bipolar plate in the fuel cell stack, then moves the positions of the multiple target tie rods, and simulates the end plate after the tie rod position is changed. Based on the simulation results, the deformation of the end plate when the tie rod is in different positions is determined, and then the optimal design positions of the multiple target tie rods are determined based on the deformation of the end plate obtained by simulation. This method improves the uniformity of the deformation of the end plate. Since the end plate will deform due to force during the packaging process of the battery stack, the deformation will be further transmitted to the inside of the battery stack, thereby causing uneven pressure distribution and affecting the performance of the battery stack. The present application improves the deformation of the end plate by changing the position of the tie rod, thereby effectively improving the uniformity of the pressure distribution inside the battery stack and achieving the purpose of improving the performance of the battery stack. This method is simple and effective, and will neither increase the cost of the battery stack nor affect the original stiffness of the end plate, which is beneficial to popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A flowchart of a fuel cell stack optimization method provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the position movement of the pull rod provided in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of a displacement cloud diagram of an end plate at an original position provided by an embodiment of the present invention;

[0035] Figure 4A schematic diagram of a displacement cloud diagram of the upper end plate after moving 25 mm provided in an embodiment of the present invention;

[0036] Figure 5 A curve diagram of the deformation difference of the upper end plate at different moving distances provided by an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of a displacement cloud diagram of a lower end plate at an original position provided by an embodiment of the present invention;

[0038] Figure 7 A schematic diagram of a displacement cloud diagram of the lower end plate after moving 25 mm provided in an embodiment of the present invention;

[0039] Figure 8 A curve diagram of the displacement difference of the lower end plate at different moving distances provided by an embodiment of the present invention;

[0040] Fig. 9 A schematic structural diagram of a fuel cell stack optimization device provided by an embodiment of the present invention;

[0041] Fig.10 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The embodiments of the present application provide a fuel cell stack optimization method, device, electronic equipment and medium. By changing the position of the pull rod and controlling the deformation of the end plate, the uniformity of the internal pressure of the stack can be effectively improved, which is beneficial to improving the electric propulsion performance.

[0043] The overall idea of ​​the technical solution of the embodiment of the present application is as follows:

[0044] A method for optimizing a fuel cell stack, the fuel cell stack comprising a plurality of target tie rods and end plates connected to the plurality of target tie rods, wherein the plurality of target tie rods are not located in the central area in the length direction of the fuel cell stack, the method comprising: determining the initial positions of the plurality of target tie rods based on the structure of the bipolar plates in the fuel cell stack; moving the positions of the plurality of target tie rods and simulating the end plates after the positions of the tie rods are changed; determining the optimal design positions of the plurality of target tie rods based on the deformation of the end plates obtained by simulation, so as to minimize the deformation of the end plates; and optimizing the design of the fuel cell stack based on the optimal design positions of the plurality of target tie rods.

[0045] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] In a first aspect, an embodiment of the present invention provides a method for optimizing a fuel cell stack, wherein the fuel cell stack includes a plurality of target tie rods and an end plate connected to the plurality of target tie rods, wherein the plurality of target tie rods are not located in the central area of ​​the fuel cell stack in the length direction. Specifically, Figure 1 As shown, the method includes the following steps S101 to S104.

[0047] Step S101 : determining initial positions of the plurality of target tie rods based on the structure of the bipolar plates in the fuel cell stack.

[0048] It should be noted that the multiple target tie rods are not located in the central area of ​​the fuel cell stack in the length direction, which means that when the number of tie rods in the length direction of one side of the fuel cell stack is an even number, all tie rods in the length direction of one side of the fuel cell stack are target tie rods, and when the number of tie rods in the length direction of one side of the fuel cell stack is an odd number, all tie rods except the middle tie rod in the length direction of one side of the fuel cell stack are target tie rods.

[0049] For example, Figure 2 As shown, there are four tie rods on one side of the fuel cell stack (side A), so the four tie rods here are all target tie rods, and there is one tie rod on side B, so this one tie rod is not the target tie rod.

[0050] In the specific implementation process, firstly, the initial position of the tie rod is designed according to the structure of the bipolar plate in the fuel cell stack. Figure 2 As shown in FIG. 1 , the stack is fastened with ten tie rods in the length direction. When the tie rods are in the initial position, the deformation of the upper end plate and the lower end plate is analyzed to obtain the displacement cloud diagram of the upper end plate and the lower end plate in the initial position, as shown in FIG. Figure 3 As shown, the displacement cloud diagram of the upper end plate is shown.

[0051] It should be noted that the function of the tie rod is to provide fastening force on the one hand, and to determine and limit the position of the membrane electrode and the bipolar plate on the other hand to prevent "collapse". In this application, according to the structure of the bipolar plate of the fuel cell stack, multiple target initial positions of the tie rod are designed, which may specifically include:

[0052] For the 8 tie rods in the long side direction of the bipolar plate, the 4 outer tie rods need to be limited due to the dumbbell shape of the bipolar plate. Therefore, the 4 outer tie rods are located at 1 / 2 of the side length of the dumbbell structure of the bipolar plate. The 4 middle tie rods are arranged with reference to the position of the disc spring, and the center of the tie rod coincides with the center of the disc spring.

[0053] In addition, the two tie rods in the short side direction of the bipolar plate are located at the 1 / 2 position of the short side of the bipolar plate.

[0054] Step S102, moving the positions of the plurality of target tie rods, and simulating the end plate after the positions of the tie rods are changed.

[0055] In a specific embodiment, before moving the positions of the plurality of tie rods, the method may further include: determining the maximum displacement of the plurality of tie rods according to the initial positions of the plurality of tie rods and the length of the end plate of the fuel cell stack. Specifically, when the initial positions of the plurality of tie rods are fixed, the maximum displacement of the tie rods is determined by the length of the end plate.

[0056] Specifically, the ratio of the maximum displacement to the length of the end plate can be between 5% and 18%. Preferably, the ratio of the maximum displacement to the length of the end plate can be 5.68%, so that when the position of the tie rod is changed, the original fastening function and other functions of the tie rod will not be damaged.

[0057] Specifically, when the number of tie rods on one side of the fuel cell stack in the length direction is an odd number, the central area in the length direction of the fuel cell stack contains an intermediate tie rod, which does not need to be moved, and the maximum displacement of the multiple target tie rods is determined by the length of the end plate. Generally speaking, the longer the end plate is, the greater the maximum displacement of the tie rod will be.

[0058] For example, when the length of the end plate is 440 mm, based on the ratio of the maximum displacement to the end plate length of 5.68%, it can be calculated that the maximum displacement is approximately 25 mm.

[0059] Specifically, if the maximum displacements of the multiple target rods are equal, the positions of the multiple rods are moved, and the end plate after the position of the rods is changed is simulated. Specifically, it may include: for each target rod, the rod is moved from the initial position to the middle area of ​​the end plate by a preset displacement unit, and the end plate is simulated after each movement of the rod until the movement distance of the rod reaches the maximum displacement, and the simulation results of the end plate when the rod is in different positions are obtained, wherein the maximum displacement is an integer multiple of the preset displacement unit.

[0060] It should be noted that the displacement unit here represents the unit length of each displacement of the pull rod.

[0061] Specifically, the ratio of the preset displacement unit amount to the length of the end plate may be between 0.237% and 2.27%. Preferably, the ratio of the displacement unit amount to the length of the end plate may be 1.14%, and the preset displacement unit amount here may be 5 mm.

[0062] Of course, as other optional embodiments, the preset displacement unit may also be 2 mm, 3 mm, 4 mm, etc.

[0063] Specifically, if Figure 2As shown by the arrows, the target rod is moved inward from the initial position by 5mm, 10mm, 15mm, 20mm and 25mm respectively, and the deformation of the end plate is analyzed when the target rod is in different positions.

[0064] For example, assuming that the target rods include rod a1, rod a2, rod a3 and rod a4, first move rod a1, rod a2, rod a3 and rod a4 to the middle area of ​​the end plate by 5 mm, and simulate the end plate after the rod positions are changed. Then move rod a1, rod a2, rod a3 and rod a4 to the middle area of ​​the end plate by 5 mm, and simulate the end plate after the rod positions are changed. Repeat the above operations until the total movement distance of rod a1, rod a2, rod a3 and rod a4 reaches 25 mm, thereby obtaining the simulation results of the end plate when the rods are in different positions.

[0065] As another optional embodiment, considering that the moving space of the two side tie rods is small (the dumbbell-shaped side length of the bipolar plate is 74 mm) and the moving space of the middle tie rod is large (243 mm), the displacement unit of the two side tie rods can be greater than the displacement unit of the middle tie rod.

[0066] In a specific embodiment, moving the positions of multiple target rods and simulating the end plate after the positions of the rods are changed may also include: moving the two end rods of the multiple target rods toward the middle by a first preset displacement unit amount, and moving the remaining rods of the multiple target rods toward the middle by a second preset displacement unit amount, and simulating the end plate after the positions of the rods are changed, wherein the first preset displacement unit amount is smaller than the second preset displacement unit amount.

[0067] Specifically, the inner tie rod is moved toward the middle area by a greater distance, and the tie rods at both ends are moved toward the middle area by a smaller distance, so that the optimal design position of the tie rod can be achieved by controlling the movement mode.

[0068] In other embodiments, the two end rods can be moved one by one from the initial position to the middle area of ​​the end plate according to the first preset displacement unit; the remaining rods in the target rods can be moved one by one from the initial position to the middle area of ​​the end plate according to the second preset displacement unit, wherein the first preset displacement unit is smaller than the second preset displacement unit, and the movement of all target rods is stopped until the moving distance of the remaining rods reaches the maximum displacement.

[0069] For example, assuming that the target rods include rod a1, rod a2, rod a3 and rod a4, wherein rod a1 and rod a4 are the two end rods, and rod a2 and rod a3 are the remaining rods in the target rods, firstly, rod a1 and rod a4 are both moved 2 mm to the middle area of ​​the end plate, and rod a2 and rod a3 are both moved 5 mm to the middle area of ​​the end plate, and the end plate after the rod positions are changed is simulated, then rod a1 and rod a4 are continued to be moved 2 mm to the middle area of ​​the end plate, and rod a2 and rod a3 are both moved 5 mm to the middle area of ​​the end plate, and the end plate after the rod positions are changed is simulated, and the above operations are repeated until the total moving distance of rod a2 and rod a3 reaches 25 mm, thereby obtaining the simulation results of the end plate when the rods are in different positions.

[0070] Preferably, the ratio of the displacement unit amount of the two side tie rods to the displacement unit amount of the middle tie rod may range from 0.2 to 0.6.

[0071] Step S103, based on the deformation of the end plate obtained by simulation, determining the optimal design position of the tie rod so as to minimize the deformation of the end plate;

[0072] Step S104, optimizing the design of the fuel cell stack based on the optimal design position of the tie rod.

[0073] In a specific embodiment, determining the optimal design positions of multiple target tie rods based on the deformation of the end plate obtained by simulation may include: determining the optimal design positions of multiple target tie rods based on the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation.

[0074] Specifically, when the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation is smaller, it indicates that the uniformity of the internal pressure of the fuel cell stack is better. Under ideal conditions, when the difference between the maximum deformation and the minimum deformation is zero, the optimal design positions of multiple target tie rods are determined.

[0075] Figure 3 is the displacement cloud diagram of the upper end plate in the initial position, such as Figure 4 As shown in the figure, it is the displacement cloud diagram of the upper end plate after multiple tie rods move 25mm, where: Figure 3 The maximum displacement (maximum deformation) of the middle and upper end plate is -1.8358mm, and the minimum displacement (minimum deformation) is -2.2908mm. Figure 4The maximum displacement of the middle upper end plate is -1.8678mm, and the minimum displacement is -2.1665mm. Therefore, it can be concluded that the deformation difference of the upper end plate in the initial position is 0.455mm, and the deformation difference of the upper end plate is 0.2987mm after the target pull rods move 25mm. Obviously, the deformation difference of the upper end plate is smaller after multiple target pull rods move 25mm, which means that the uniformity of the deformation of the upper end plate is improved.

[0076] like Figure 5 As shown in the figure, it is a curve chart of the deformation difference of the upper end plate under different moving distances, wherein the ordinate is the difference between the maximum deformation and the minimum deformation of the upper end plate obtained by simulation (i.e., the deformation difference), and the abscissa is the moving distance of the tie rod. It can be seen from the figure that as multiple target tie rods gradually approach the middle area, the deformation difference of the upper end plate gradually decreases, which indicates that the uniformity of the end plate deformation has improved. Therefore, appropriately moving the target tie rods closer to the middle area can effectively improve the deformation of the end plate, which is beneficial to the performance of the fuel cell stack.

[0077] Specifically, assuming that the travel distance of the tie rod is x (mm) and the deformation difference is y (mm), the fitting formula for the upper end plate is y=-0.0063x+0.4539. Therefore, after determining the maximum displacement of the tie rod, the deformation difference of the upper end plate can be determined. For example, if the maximum displacement of the tie rod is 25mm, and it is substituted into the above fitting formula, the deformation difference can be obtained to be about 0.3.

[0078] Therefore, based on the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation, determining the optimal design position of the pull rod may include: if the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation is less than or equal to 0.3 mm, then determining that the current positions of multiple target pull rods are the optimal design positions of the pull rods.

[0079] As another optional embodiment, determining the optimal design positions of multiple target tie rods based on the deformation of the end plate obtained by simulation may also include: determining the optimal design position of the tie rod based on the ratio of the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation to the maximum deformation. Specifically, when the ratio is smaller, the pressure distribution consistency inside the stack is better.

[0080] Alternatively, determining the optimal design positions of multiple target tie rods based on the deformation of the end plates obtained through simulation may also include: determining the optimal design positions of the tie rods based on an average value of the deformation of the end plates obtained through simulation.

[0081] Specifically, when the average value of the deformation of the end plate obtained by simulation is smaller, the pressure distribution consistency inside the stack is better. For example, when the average value of the deformation of the end plate is less than 0.1 mm, the current positions of the multiple target tie rods are determined to be the optimal design positions.

[0082] Of course, there are other methods for determining the optimal design positions of multiple target tie rods by simulating the deformation of the end plate, and this application will not cite them one by one.

[0083] It should be noted that whether the tie rod reaches the optimal design position is also related to the structure of the end plate. That is to say, for end plates of different structures, the optimal design position of the tie rod is different.

[0084] Figure 6 is the displacement cloud diagram of the lower end plate in the initial position, Figure 7 This is the displacement cloud diagram of the lower end plate after the target pull rod moves 25mm, where: Figure 6 The maximum displacement (maximum deformation) of the middle and lower end plates is 0.49941 mm, and the minimum displacement (minimum deformation) is 0.12482 mm. Figure 7 The maximum displacement of the middle and lower end plates is 0.3813mm, and the minimum displacement is 0.15074mm. Therefore, it can be concluded that the deformation difference of the lower end plate in the initial position is 0.37459mm, and the deformation difference of the lower end plate is 0.23056mm after the target pull rods move 25mm. Obviously, the deformation difference of the lower end plate is smaller after multiple target pull rods move 25mm, which means that the uniformity of the deformation of the lower end plate is improved.

[0085] Figure 8 It is a curve graph of the displacement difference of the lower end plate under different moving distances, where the ordinate is the difference between the maximum displacement and the minimum displacement of the lower end plate obtained by simulation (i.e., the deformation difference), and the abscissa is the moving distance of the pull rod. It can be seen from the figure that with the increase of the moving distance, the deformation difference gradually decreases, and the uniformity of the end plate deformation is improved, which is beneficial to the performance of the fuel cell stack.

[0086] Assuming the moving distance is x (mm) and the deformation difference is y (mm), the fitting formula of the lower end plate is y=-0.0058x+0.3735 (X≤25). Therefore, after determining the maximum displacement of the tie rod, the deformation difference of the lower end plate can be determined.

[0087] According to the above optimization conclusions, the final fastening solution is determined to be a moving distance x = 25 mm. After determining the optimal design positions of multiple target tie rods, the fuel cell stack is designed.

[0088] Preferably, considering that the tie rod needs to provide vertical support and limiting for the bipolar plates and membrane electrodes inside the battery stack to prevent the core from collapsing, after the target tie rod position moves to 25mm, it is not recommended to move further to the middle, that is, when it moves to 30mm and 35mm, the tie rods on both sides have lost contact with the dumbbell-shaped side length of the bipolar plate, affecting the support and limiting effects. Therefore, it is better to move 25mm.

[0089] From the above analysis, it can be seen that the optimization method provided in this application is applicable to both the upper end plate and the lower end plate.

[0090] In summary, the present application reduces the deformation of the end plate by changing the position of the pull rod, improves the consistency of the pressure distribution inside the fuel cell stack, and achieves the purpose of improving the performance of the fuel cell stack. This method is simple and effective, will not increase the cost of the fuel cell stack, and will not affect the original stiffness of the end plate, and is conducive to popularization and use.

[0091] In the second aspect, based on the same inventive concept, this embodiment provides an optimization device for a fuel cell stack, such as Fig. 9 As shown, including:

[0092] An initial position determination module 401 is used to determine the initial positions of a plurality of target tie rods based on the structure of the bipolar plates in the fuel cell stack;

[0093] A simulation module 402 is used to move the positions of the plurality of target tie rods and simulate the end plate after the positions of the tie rods are changed;

[0094] A tie rod position determination module 403, configured to determine the optimal design positions of the plurality of target tie rods based on the deformation of the end plate obtained through simulation, so as to minimize the deformation of the end plate;

[0095] The design module 404 is used to optimize the design of the fuel cell stack based on the optimal design positions of the multiple target tie rods.

[0096] As an optional embodiment, the tie rod position determination module 403 includes: a tie rod position determination submodule, which is used to determine the optimal design positions of the multiple target tie rods based on the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation.

[0097] As an optional embodiment, the tie rod position determination submodule is specifically used to: if the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation is less than or equal to 0.3 mm, then determine that the current positions of multiple target tie rods are the optimal design positions.

[0098] As an optional embodiment, the tie rod position determination module 403 is further used to determine the optimal design position of the tie rod based on the ratio of the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation to the maximum deformation.

[0099] As an optional embodiment, the device further includes: a maximum displacement determination module, which is used to determine the maximum displacement of the multiple target tie rods according to the initial positions of the multiple target tie rods and the length of the end plate of the fuel cell stack.

[0100] As an optional embodiment, the ratio of the maximum displacement to the length of the end plate is between 5% and 18%.

[0101] As an optional embodiment, the ratio of the maximum displacement to the length of the end plate is 5.68%.

[0102] As an optional embodiment, the simulation module 402 is specifically used to: for each target pull rod, move the target pull rod from the initial position to the middle area of ​​the end plate by a preset displacement unit amount, and simulate the end plate after each pull rod movement until the movement distance of the pull rod reaches the maximum displacement amount, wherein the maximum displacement amount is an integer multiple of the preset displacement unit amount.

[0103] As an optional embodiment, the ratio of the preset displacement unit to the length of the end plate is between 0.237% and 2.27%.

[0104] As an optional embodiment, the ratio of the preset displacement unit to the end plate is 1.14%.

[0105] As an optional embodiment, the simulation module 402 is specifically used to: move the two end rods of the multiple target rods to the middle area of ​​the end plate by a first preset displacement unit amount, move the remaining rods of the multiple target rods to the middle area of ​​the end plate by a second preset displacement unit amount, and simulate the end plate after the rod position is changed, wherein the first preset displacement unit amount is smaller than the second preset displacement unit amount.

[0106] The above modules can be implemented by software codes, in which case, the above modules can be stored in the memory of the control device. The above modules can also be implemented by hardware such as integrated circuit chips.

[0107] An optimization device for a fuel cell stack provided in an embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, reference may be made to the corresponding contents in the aforementioned method embodiment for matters not mentioned in the device embodiment.

[0108] In a third aspect, based on the same inventive concept, this embodiment provides an electronic device 500, such as Fig.10 As shown, it includes: a memory 501, a processor 502 and a computer program 503 stored in the memory and executable on the processor, and when the processor 502 executes the program, the steps of the fuel cell stack optimization method described in the first aspect are implemented.

[0109] Since the electronic device introduced in this embodiment is an electronic device used to implement the optimization method of the fuel cell stack in the embodiment of the present application, based on the optimization method of the fuel cell stack introduced in the embodiment of the present application, the technical personnel of the field can understand the specific implementation of the electronic device of the present embodiment and its various variations, so how the electronic device implements the method in the embodiment of the present application is not described in detail here. As long as the electronic device used by the technical personnel of the field to implement the optimization method of the fuel cell stack in the embodiment of the present application, it belongs to the scope of protection of this application.

[0110] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0111] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for optimizing a fuel cell stack, characterized in that: The fuel cell stack includes a plurality of target tie rods and end plates connected to the plurality of target tie rods, wherein the plurality of target tie rods are not located in a central area in a length direction of the fuel cell stack, and the method includes: Determining initial positions of the plurality of target tie rods based on the structure of the bipolar plates in the fuel cell stack; Moving the positions of the plurality of target tie rods, and simulating the end plate after the positions of the tie rods are changed; Based on the deformation of the end plate obtained by simulation, determining the optimal design positions of the multiple target tie rods so as to minimize the deformation of the end plate; Optimizing the design of the fuel cell stack based on the optimal design positions of the multiple target tie rods; The moving of the positions of the multiple target rods and simulating the end plate after the positions of the rods are changed include: moving the two end rods of the multiple target rods toward the middle by a first preset displacement unit amount, moving the remaining rods of the multiple target rods toward the middle by a second preset displacement unit amount, and simulating the end plate after the positions of the rods are changed, wherein the first preset displacement unit amount is smaller than the second preset displacement unit amount.

2. The method according to claim 1, characterized in that The step of determining the optimal design positions of the plurality of target tie rods based on the deformation of the end plate obtained by simulation includes: Based on the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation, the optimal design positions of the plurality of target tie rods are determined.

3. The method according to claim 2, characterized in that The determining the optimal design positions of the plurality of target tie rods based on the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation includes: If the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation is less than or equal to 0.3 mm, it is determined that the current positions of the multiple target tie rods are the optimal design positions.

4. The method according to claim 1, characterized in that The step of determining the optimal design positions of the plurality of target tie rods based on the deformation of the end plate obtained by simulation includes: The optimal design position of the tie rod is determined based on the ratio of the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation to the maximum deformation.

5. The method according to claim 1, characterized in that Before moving the positions of the plurality of target pull rods, the method further comprises: The maximum displacements of the plurality of target tie rods are determined according to the initial positions of the plurality of target tie rods and the length of the end plate of the fuel cell stack.

6. The method according to claim 5, characterized in that A ratio between the maximum displacement and the length of the end plate is between 5% and 18%.

7. The method according to claim 5, characterized in that The ratio between the maximum displacement and the length of the end plate is 5.68%.

8. The method according to claim 5, characterized in that If the maximum displacements of the plurality of target tie rods are equal, moving the positions of the plurality of target tie rods and simulating the end plate after the positions of the tie rods are changed includes: For each target tie rod, the tie rod is moved successively from the initial position to the middle area of ​​the end plate by a preset displacement unit, and the end plate is simulated after each tie rod movement until the movement distance of the tie rod reaches the maximum displacement, wherein the maximum displacement is an integer multiple of the preset displacement unit.

9. The method according to claim 8, characterized in that The ratio of the preset displacement unit to the length of the end plate is between 0.237% and 2.27%.

10. The method according to claim 8, characterized in that The ratio between the preset displacement unit and the length of the end plate is 1.14%.

11. A fuel cell stack optimization device, characterized in that: include: An initial position determination module, used to determine the initial positions of a plurality of target tie rods based on the structure of the bipolar plates in the fuel cell stack; A simulation module, used for moving the positions of the plurality of target tie rods and simulating the end plate after the positions of the tie rods are changed; A tie rod position determination module, used to determine the optimal design positions of the plurality of target tie rods based on the deformation of the end plate obtained by simulation, so as to minimize the deformation of the end plate; A design module, used for optimizing the design of a fuel cell stack based on the optimal design positions of the multiple target tie rods; The simulation module is specifically used to move the two end rods of the multiple target rods toward the middle by a first preset displacement unit amount, move the remaining rods of the multiple target rods toward the middle by a second preset displacement unit amount, and simulate the end plate after the position of the rods is changed, wherein the first preset displacement unit amount is smaller than the second preset displacement unit amount.

12. The device according to claim 11, characterized in that The pull rod position determination module comprises: The tie rod position determination submodule is specifically used to determine the optimal design positions of the multiple target tie rods based on the difference between the maximum deformation and the minimum deformation of the end plate obtained by simulation.

13. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method according to any one of claims 1 to 10 are implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 10 are implemented.

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