Fuel cell stack and preparation method and application thereof

Abstract

The invention discloses a fuel cell stack and a preparation method and application thereof.The fuel cell stack comprises a first end plate, a second end plate, an electric pile core and a piston air cylinder device, the electric pile core is clamped between the first end plate and the second end plate, and the piston air cylinder device is arranged on the side, away from the electric pile core, of the second end plate; the pressure of the piston air cylinder device is adjusted through the pressure control device. Therefore, the length of the fuel cell stack is constant, and the compression force on the effective area of the fuel cell stack is uniform and constant, so that the cell performance of the fuel cell stack is remarkably improved. In addition, the piston cylinder device is adopted to replace a conventional compression device, so that the weight of the whole fuel cell stack can be reduced, and transportation and use of the fuel cell stack are facilitated.

Description

Technical Field

[0001] The present invention belongs to the field of fuel cells, and in particular relates to a fuel cell stack and a preparation method and application thereof. Background Art

[0002] In the process of applying the fuel cell stack structure or fuel cell system, multiple MEAs (fuel cell units) are arranged in a series stack between bipolar plates. There is always a tolerance between the bipolar plates and the fuel cell units on both sides of the fuel cell units. The accumulation of these tolerances will cause a large change in the total length of the fuel cell stack, and the compression force on the fuel cell stack will also change greatly, which will pose a great challenge to the assembly and integration of the fuel cell system.

[0003] The solution of the prior art is mainly to use a conventional compression system to compress the fuel cell stack until the fuel cell stack is compressed to a target stack compression force, ensure that the length of the fuel cell stack remains unchanged through an adjustable length mechanism (such as a threaded connection on the end plate), and compensate for the loss of stack compression force during use through a pressure regulating device (such as a spring).

[0004] The disadvantages of the solutions of the prior art include: (1) using an adjustable length mechanism (such as a threaded connection on the end plate) to perform secondary compression on the stacked MEA (battery unit) to ensure that the length of the fuel cell stack remains unchanged. The disadvantages are: first, the force distribution in the stacking area is uneven, and second, the screws may fail or loosen under impact / vibration conditions; (2) gaskets are provided between the screws and the stacking area to ensure that the length of the fuel cell stack remains unchanged. The disadvantages are: first, the gaskets have a certain weight, which will increase the weight of the entire fuel cell stack structure or the fuel cell system. Second, the gaskets may slip under impact / vibration conditions; and third, there is a problem of difficulty in assembly; (3) springs are provided between the end plate and the stacking area to achieve compensation of the compression force of the stacking area over time. The disadvantages are: first, the compression force of the stacking area will not be fully compensated, thereby causing the performance of the fuel cell to decline. Second, the springs may slip under vibration conditions. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the purpose of the present invention is to provide a fuel cell stack and a preparation method and application thereof. As a result, the length of the fuel cell stack is constant, and the compression force on the effective area of ​​the fuel cell stack is uniform and constant, thereby significantly improving the battery performance of the fuel cell stack. In addition, the use of a piston-cylinder device instead of a conventional compression device can reduce the weight of the entire fuel cell stack, which is beneficial to the transportation and use of the fuel cell stack.

[0006] In a first aspect of the present invention, the present invention provides a fuel cell stack. In an embodiment of the present invention, the fuel cell stack comprises:

[0007] A first end plate, a second end plate, an electric core and a piston-cylinder device, wherein the electric core is clamped between the first end plate and the second end plate, and the piston-cylinder device is arranged on a side of the second end plate away from the electric core, and the pressure of the piston-cylinder device is adjusted by a pressure control device.

[0008] According to the fuel cell stack of the embodiment of the present invention, the piston-cylinder device is clamped between the first end plate and the second end plate, and the pressure of the piston-cylinder device is kept constant by regulating the pressure control device, thereby compensating for the changes in the compression force of the fuel cell stack caused by thermal expansion, thermal contraction, GDL creep, seal creep and fuel cell supercharging of the electric core, thereby maintaining a uniform and constant compression force on the effective area of ​​the fuel cell stack. In this way, the length of the fuel cell stack is constant, and the compression force on the effective area of ​​the fuel cell stack is ensured to be uniform and constant, thereby significantly improving the battery performance of the fuel cell stack. In addition, the use of a piston-cylinder device instead of a conventional compression device can reduce the weight of the entire fuel cell stack, which is beneficial to the transportation and use of the fuel cell stack.

[0009] In addition, the fuel cell stack according to the above embodiment of the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, the pressure control device includes a vehicle boost system.

[0011] In some embodiments of the present invention, the vehicle pressurization system comprises a vehicle air conditioning system.

[0012] In some embodiments of the invention, the vehicle boost system comprises a vehicle braking system.

[0013] In some embodiments of the present invention, the pressure control device includes a shut-off valve or a pressure regulator to adjust the pressure of the piston-cylinder device.

[0014] In a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned fuel cell stack, comprising:

[0015] (1) stacking and compressing the first end plate, the second end plate, the fuel cell core, and the piston cylinder device to a preset length;

[0016] (2) installing a positioning device between the first end plate and the piston-cylinder device;

[0017] (3) using a pressurizing device to pressurize the piston-cylinder device so that the piston-cylinder device expands and moves toward the fuel cell core;

[0018] (4) When the piston-cylinder device moves to the battery core, a pressure control device is used to adjust the pressure of the piston-cylinder device to compress the battery core to a target stack compression force.

[0019] According to the method for preparing a fuel cell stack according to an embodiment of the present invention, the first end plate, the second end plate, the fuel cell core and the piston cylinder device are stacked and compressed to a preset length (L max ), when the distance from the lower surface of the first end plate to the upper surface of the piston cylinder device reaches a preset length (L max ), a positioning device is installed between the first end plate and the piston cylinder device, and the positioning device can ensure the above-mentioned preset length (L max ) remain unchanged; a pressurizing device is used to pressurize and expand the piston cylinder device so that the piston cylinder device expands and moves toward the core of the fuel cell stack, and then a pressure control device is used to adjust the pressure of the piston cylinder device to compress the fuel cell stack to the target stack compression force, thereby simplifying the manufacturing and assembly process of the fuel cell stack and reducing the economic cost of fuel cell hardware and fuel cell stacking. The above compression process can provide partial compression performance for the compressed fuel cell stack, and the remaining compression performance can be provided by the piston cylinder device. Specifically, by regulating the pressure of the piston cylinder device through the pressure control device, the compression force changes of the fuel cell stack caused by thermal expansion, thermal contraction, GDL creep, seal creep and fuel cell pressurization of the fuel cell stack can be compensated, thereby maintaining a uniform and constant compression force on the effective area of ​​the fuel cell stack.

[0020] In addition, the method according to the above embodiment of the present invention may also have the following additional technical features:

[0021] In some embodiments of the present invention, the positioning device includes at least one of a tension bar, a tension belt and a pull rod.

[0022] In a third aspect of the present invention, the present invention provides a fuel cell vehicle. According to an embodiment of the present invention, the fuel cell vehicle has the fuel cell stack described in the above embodiment or a fuel cell stack prepared by the method described in the above embodiment.

[0023] In addition, the fuel cell vehicle according to the above embodiment of the present invention may also have the following additional technical features:

[0024] In some embodiments of the present invention, it further includes: a third end plate, wherein the third end plate is arranged on a side of the piston-cylinder device away from the battery core.

[0025] In some embodiments of the present invention, the present invention further comprises: a tension device, which is disposed on the third end plate and is used to prevent the pressure of the fuel cell stack from decreasing.

[0026] In some embodiments of the present invention, it also includes: a locking device, one end of which is connected to the first end plate, and the other end of which is connected to the third end plate, so as to achieve a fixed interval between the first end plate and the third end plate.

[0027] In some embodiments of the present invention, the second end plate is provided with a sealing portion, the sealing portion conforms to the structure of a portion of the piston-cylinder device to prevent pressure leakage of the piston-cylinder device.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 A schematic diagram of a fuel cell stack according to an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a fuel cell vehicle stack according to an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a stack of a fuel cell vehicle with a vehicle air conditioning system as a booster device according to an embodiment of the present invention;

[0033] Figure 4 The figure is a schematic flow chart of a method for preparing a fuel cell stack according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] 1-first end plate; 2-second end plate; 3-electrical core; 4-piston-cylinder device; 5-locking device; 6-third end plate; 7-tension device; 8-sealing part; 9-air inlet; 10-manifold; 11-condenser; 12-expansion valve; 13-evaporator; 14-compressor; 15-pressure regulator. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of the above embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The present invention provides a fuel cell stack. Figure 1 and2 , comprising: a first end plate 1, a second end plate 2, an electric core 3 and a piston-cylinder device 4, wherein the electric core 3 is clamped between the first end plate 1 and the second end plate 2, and the piston-cylinder device 4 is arranged on a side of the second end plate 2 away from the electric core 3, and the pressure of the piston-cylinder device 4 is adjusted by a pressure control device (not shown in the figure).

[0038] The principle by which the fuel cell stack proposed by the present invention can achieve the above beneficial effects is described in detail below:

[0039] During the operation of the fuel cell stack, the fuel cell stack length and the fuel cell stack compression force may change due to the fuel cell stack thermal expansion, thermal contraction, GDL creep, seal creep and fuel cell supercharging. For example, due to the GDL creep, the fuel cell stack shrinks, the piston cylinder device 4 expands, and the pressure of the piston cylinder device 4 decreases. At this time, the pressure of the piston cylinder device 4 can be increased by the pressure control device to ensure that the fuel cell stack compression force remains constant; for another example, due to the fuel cell supercharging, the fuel cell stack expands, the piston cylinder device 4 shrinks, and the pressure of the piston cylinder device 4 increases. At this time, the pressure of the piston cylinder device 4 can be reduced by the pressure control device to ensure that the fuel cell stack compression force remains constant. By setting the above-mentioned piston cylinder device 4, it can be ensured that the fuel cell stack can maintain a constant stack compression force throughout its service life to prevent possible fuel leakage, air leakage and / or coolant leakage, thereby causing damage to the above-mentioned fuel cell stack materials. In this way, the length of the fuel cell stack is constant, and the compression force on the effective area of ​​the fuel cell stack is ensured to be uniform and constant, thereby significantly improving the battery performance of the fuel cell stack. In addition, the use of the piston-cylinder device 4 instead of the conventional compression device can reduce the weight of the entire fuel cell stack, which is beneficial to the transportation and use of the fuel cell stack.

[0040] It should be noted that a reduction in stack compression force may increase the electrical contact resistance between the GDL and the bipolar plates on both sides of the fuel cell, thereby reducing the performance of the fuel cell. In addition, a reduction in stack compression force may also cause leakage of fuel, air or coolant.

[0041] In an embodiment of the present invention, a plurality of fuel cells are stacked in series to form a fuel cell core 3 .

[0042] According to some specific embodiments of the present invention, the above-mentioned pressure control device includes a vehicle boosting system, and the boosting system of the above-mentioned vehicle includes a vehicle air-conditioning system and a vehicle braking system. When the above-mentioned fuel cell stack is used as a part of the vehicle's electrical equipment, the vehicle's own air-conditioning device and / or braking device can adjust the pressure of the piston cylinder device 4 in real time. As a result, it avoids the economic waste and space waste caused by the use of a single pressure control device, and ensures that real-time regulation can be performed at any time according to the pressure of the piston cylinder device 4.

[0043] Specifically, the pressure control device is taken as an example of a vehicle air conditioning system. Figure 3 When the temperature in the vehicle is high, the compressor 14 in the vehicle air conditioning system can increase the gas pressure in the device, and the high-pressure gas condenses in the condenser 11. The heat generated by the gas condensation will be released to the surrounding environment. Subsequently, the liquid refrigerant reduces the pressure and temperature of the high-pressure gas through the expansion valve 12, and the low-pressure mixture formed by the liquid and the gas evaporates in the evaporator 13, thereby absorbing the heat of the cabin and generating cooling. The vehicle air conditioning system plays the role of cooling air conditioning. When the temperature in the vehicle is low, the vehicle air conditioning system can be reverse cycled. The vehicle air conditioning system is equivalent to a heat pump and can increase the temperature in the vehicle. During the heat pump cycle, the evaporator 13 plays the role of the condenser 11, and the condenser 11 plays the role of the evaporator 13. The above-mentioned piston cylinder device 4 can be connected to the high-pressure pipeline of the air conditioning system through a three-way valve. By detecting the pressure change in the piston cylinder device 4, the vehicle air conditioning system is switched between cooling air conditioning and heat pump, and then the pressure of the piston cylinder device 4 is regulated to maintain a uniform and constant compression force on the effective area of ​​the fuel cell stack.

[0044] According to some further specific embodiments of the present invention, Figure 3 The vehicle air conditioning system includes a pressure regulator 15 and a check valve to adjust the pressure of the piston-cylinder device 4, thereby better regulating the pressure of the piston-cylinder device 4, thereby maintaining a uniform and constant compression force on the effective area of ​​the fuel cell stack; similarly, the vehicle braking system includes a pressure regulator and a check valve to adjust the pressure of the piston-cylinder device 4, thereby better regulating the pressure of the piston-cylinder device 4, thereby maintaining a uniform and constant compression force on the effective area of ​​the fuel cell stack.

[0045] In the embodiment of the present invention, the factors affecting the pressure of the piston-cylinder device 4 include parameters such as the target compression force and compression effective area of ​​the fuel cell stack. Those skilled in the art can select the pressure of the piston-cylinder device 4 according to actual conditions.

[0046] In a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned fuel cell stack, referring to the attached Figure 4 , the above method comprises:

[0047] S100: stacking and compressing the first end plate, the second end plate, the fuel cell core and the piston cylinder device to a preset length

[0048] In this step, refer to the attached Figure 1-3 , in order from front to back, the first end plate 1, the second end plate 2, the battery core 3 and the piston cylinder device 4 are stacked in sequence, and the stacked laminate is compressed by a compression device until the distance from the upper surface of the piston cylinder device 4 to the lower surface of the first end plate 1 is L max The above-mentioned fuel cell stack refers to a fuel cell stack formed by stacking a plurality of fuel cells in series.

[0049] In the embodiment of the present invention, L max The determination method is: if the thickness of a single fuel cell after compression varies within a range of T MEA ±Tol. MEA The thickness of the bipolar plates on both sides of a single battery after compression varies within a range of T BPP ±Tol. BPP , the total thickness variation range of the first end plate 1 and the second end plate 2 is T EP ±Tol. EP , the thickness variation range of other parts is L HW ±tol. HW The total number of cells in the fuel cell stack is n, and the length of the fuel cell stack is L = n (T MEA ±Tol. MEA )+(n-1)(T BPP ±Tol. BPP )+(T EP ±Tol. EP )+(L HW ±tol. HW ) From this, we can get that L max =n(T MEA +Tol. MEA )+(n-1)(T BPP +Tol. BPP )+(T EP +Tol. EP )+(L HW +tol. HW ), L min =n(T MEA -Tol. MEA )+(n-1)(T BPP -Tol. BPP )+(T EP -Tol. EP )+(L HW -tol.HW ).

[0050] In the embodiment of the present invention, the device for compressing the stacked laminate is not specially selected, and those skilled in the art can select it at will according to the actual situation. As a specific example, the above device can be a main hydraulic press assembly fixture.

[0051] According to a specific embodiment of the present invention, the above-mentioned S100 also includes: setting the tension device 7 on the piston cylinder device 4 to prevent the above-mentioned piston cylinder device 4 from shifting, so that when the pressure of the piston cylinder device 4 decreases due to leakage, the tension device 7 can prevent the compression force on the effective area of ​​the fuel cell stack from no longer remaining uniform and constant.

[0052] In the embodiment of the present invention, the tension device 7 is not particularly limited, and those skilled in the art can select it at will according to actual conditions. As a specific example, the tension device 7 includes but is not limited to at least one of a screw rod and a pull rod.

[0053] S200: Install the positioning device between the first end plate and the piston cylinder device

[0054] In this step, refer to the attached Figure 1-2 , one end of the locking device 5 is connected to the first end plate 1, and the other end of the locking device 5 is connected to the piston cylinder device 4, so that the distance from the upper surface of the first end plate 1 to the lower surface of the piston cylinder device 4 is maintained at L max .

[0055] In the embodiment of the present invention, the positioning device is not subject to any special limitation, as long as the distance from the upper surface of the first end plate 1 to the lower surface of the piston cylinder device 4 can be kept constant.

[0056] S300: Use a pressurizing device to pressurize the piston cylinder device so that the piston cylinder device expands and moves toward the battery core.

[0057] In this step, refer to the attached Figure 1-2, a pressurizing device is used to pressurize the piston-cylinder device 4 so that one side of the piston-cylinder device 4 stops against the electric stack core 3. Specifically, a pressurizing device is used to pressurize the piston-cylinder device 4, and the piston-cylinder device 4 expands. One side of the expanded piston-cylinder device 4 forces the second end plate 2 to move toward the first end plate 1, thereby achieving compression of the fuel cell stack, and then the fuel cell stack is controlled to reach a preset stack compression force by adjusting the pressure of the piston-cylinder device 4. The first end plate 1, the second end plate 2, the electric stack core 3 and the piston-cylinder device 4 are stacked and compressed in sequence. This stacking and compression process can provide partial compression performance for the compressed fuel cell stack, and the remaining compression performance can be provided by the piston-cylinder device 4. In this way, the length of the fuel cell stack is kept constant, and the compression force on the effective area of ​​the fuel cell stack is ensured to be uniform and constant, thereby significantly improving the battery performance of the fuel cell stack. The above-mentioned predetermined stack compression pressure = the value of the total stack compression force / the area where the piston-cylinder device 4 contacts the second end plate 2.

[0058] It should be noted that: during the expansion process of the piston cylinder device 4, the maximum travel of the piston cylinder device 4 at both ends should be greater than or equal to (L max —L min ), therefore, when the fuel cell stack ages, the gas diffusion layer creeps, the fuel cell stack expands or contracts due to temperature changes, the membrane electrode assembly expands due to water absorption, etc., causing the length of each component in the fuel cell stack to change, and thus causing the compression force of the fuel cell stack to fluctuate, the piston cylinder device 4 can be adjusted by adjusting the stroke of moving forward and backward, thereby adjusting the compression force on the effective area of ​​the fuel cell stack, so that the compression force on the effective area of ​​the fuel cell stack remains unchanged; in addition, as described in the background technology, there is always a tolerance between the bipolar plates and the fuel cells on both sides of the fuel cell. The accumulation of these tolerances will cause a large change in the total length of the fuel cell stack, and the compression force on the fuel cell stack will also change greatly. By adjusting the stroke of moving forward and backward of the piston cylinder device 4, the problem caused by the tolerance accumulation can also be solved, thereby achieving a constant length of the fuel cell stack and ensuring that the compression force on the effective area of ​​the fuel cell stack is uniform and constant.

[0059] In the embodiment of the present invention, the pressurizing device for pressurizing the piston-cylinder device 4 includes but is not limited to the compressor 14 .

[0060] S400: When the piston cylinder device moves to the battery core, the pressure control device is used to adjust the pressure of the piston cylinder device to compress the battery core to the target stack compression force.

[0061] In this step, the pressure control device is connected to the piston cylinder device 4 to form a fuel cell stack. By regulating the pressure of the piston cylinder device 4 by the pressure control device, the changes in the compression force of the fuel cell stack caused by thermal expansion, thermal contraction, GDL creep, seal creep and fuel cell pressurization of the fuel cell stack can be compensated, thereby maintaining a uniform and constant compression force on the effective area of ​​the fuel cell stack.

[0062] In the third aspect of the present invention, the present invention provides a fuel cell vehicle. According to an embodiment of the present invention, the fuel cell vehicle has the fuel cell stack described in the above embodiment or the fuel cell stack prepared by the method described in the above embodiment. As a result, the fuel cell vehicle equipped with the fuel cell stack has excellent endurance, thereby further meeting the use needs of consumers.

[0063] According to some specific embodiments of the present invention, it further includes: a third end plate 6 , and the third end plate 6 is arranged on a side of the piston-cylinder device 4 away from the battery core 3 .

[0064] According to some further specific embodiments of the present invention, Figure 1 and 2 The fuel cell vehicle further includes: a tension device 7, which is arranged on the third end plate 6. When the internal pressure of the piston cylinder device 4 is reduced due to leakage, the fuel cell stack will expand, and the compression force on the effective area of ​​the fuel cell stack will correspondingly decrease or even disappear. Therefore, by arranging the tension device 7 on the third end plate 6, when the internal pressure of the piston cylinder device 4 is reduced due to leakage, the tension device 7 can prevent the fuel cell stack from expanding, thereby ensuring that the compression force on the effective area of ​​the fuel cell stack remains constant.

[0065] In the embodiment of the present invention, the tension device 7 is not particularly limited, and those skilled in the art can select it at will according to actual conditions. As a specific example, the tension device 7 includes but is not limited to at least one of a screw rod and a pull rod.

[0066] According to some other specific embodiments of the present invention, it also includes: a locking device 5, one end of the locking device 5 is connected to the first end plate 1, and the other end of the locking device 5 is connected to the third end plate 6, so as to achieve a fixed interval between the first end plate 1 and the third end plate 6.

[0067] According to some further specific embodiments of the present invention, the second end plate 2 is provided with a sealing portion 8 , which is conformable to a portion of the structure of the piston-cylinder device 4 to prevent pressure leakage of the piston-cylinder device 4 .

[0068] In the embodiment of the present invention, the structure of the sealing portion 8 is not particularly limited. As a specific example, the sealing portion 8 includes but is not limited to at least one of a sealing ring and an O-ring.

[0069] According to some further specific embodiments of the present invention, Figure 1 and 2 The third end plate 6 is provided with an air inlet 9, whereby the piston cylinder device 4 is connected to the pressure control device through the air inlet 9, so that the pressure control device can better adjust the pressure of the piston cylinder device 4 in real time.

[0070] According to some further specific embodiments of the present invention, Figure 1 and 2 The module further includes: a manifold 10, which is disposed on a side of the first end plate 1 away from the third end plate 6, so that fuel, air and coolant can be provided to the fuel cell stack through the manifold 10, which is conducive to the normal operation of the fuel cell.

[0071] In the embodiment of the present invention, the number of the manifolds 10 is not particularly limited, and those skilled in the art may select the number of the manifolds 10 according to actual conditions.

[0072] Compared with the prior art, the fuel cell stack and the method for preparing the fuel cell stack of the present invention have at least the following advantages:

[0073] (1) It not only achieves a constant length of the fuel cell stack, but also ensures that the compression force on the effective area of ​​the fuel cell stack is uniform and constant, significantly improving the battery performance of the fuel cell stack;

[0074] (2) The present invention connects the pressure control device and the piston cylinder device, which not only achieves a constant length of the fuel cell stack, but also ensures that the compression force on the effective area of ​​the fuel cell stack is uniform and constant, overcoming the defects of the adjustable length mechanism, gasket and spring mentioned in the background art;

[0075] (3) The use of a piston-cylinder device instead of a conventional compression device can reduce the weight of the entire fuel cell stack, which is beneficial to the transportation and use of the fuel cell stack;

[0076] (4) In the prior art, a conventional compression system is first used to compress the fuel cell stack until the fuel cell stack is compressed to a target stack compression force, and an adjustable length mechanism (such as a threaded connection on an end plate) is used to ensure that the length of the fuel cell stack remains unchanged, and a pressure regulating device (such as a spring) is used to compensate for the loss of stack compression force during use. The present invention first compresses the first end plate, the second end plate, the stack core, and the piston cylinder device to a preset length L. max, a locking device is used to fix the above length to remain unchanged, and a pressure control device and a piston cylinder device are used to adjust the length of the fuel cell stack and the stack compression force, thereby simplifying the manufacturing and assembly process of the fuel cell stack, thereby reducing the economic cost of fuel cell hardware and fuel cell stacking;

[0077] (5) The vehicle's built-in air conditioning device and / or braking device can be used as a pressure control device to adjust the pressure of the piston cylinder device. When the above-mentioned fuel cell stack is used as a part of the vehicle's electrical equipment, the vehicle's built-in air conditioning device and / or braking device can adjust the pressure of the piston cylinder device in real time. This avoids the economic waste and space waste caused by the use of a single pressure control device, and ensures that real-time regulation can be performed at any time according to the pressure of the piston cylinder device.

[0078] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fuel cell stack, characterized in that: include: A first end plate, a second end plate, an electric core and a piston-cylinder device, wherein the electric core is clamped between the first end plate and the second end plate, and the piston-cylinder device is arranged on a side of the second end plate away from the electric core, and the pressure of the piston-cylinder device is adjusted by a pressure control device.

2. The fuel cell stack module according to claim 1, characterized in that: The pressure control device includes a vehicle boost system.

3. The fuel cell stack according to claim 2, characterized in that: The vehicle pressurization system includes a vehicle air conditioning system.

4. The fuel cell stack according to claim 2, characterized in that: The vehicle boost system includes a vehicle braking system.

5. The fuel cell stack according to any one of claims 1 to 4, characterized in that: The pressure control device comprises a shut-off valve or a pressure regulator so as to adjust the pressure of the piston-cylinder device.

6. A method for preparing a fuel cell stack according to any one of claims 1 to 5, characterized in that: include: (1) stacking and compressing the first end plate, the second end plate, the fuel cell core, and the piston cylinder device to a preset length; (2) installing a positioning device between the first end plate and the piston-cylinder device; (3) using a pressurizing device to pressurize the piston-cylinder device so that the piston-cylinder device expands and moves toward the fuel cell core; (4) When the piston-cylinder device moves to the battery core, a pressure control device is used to adjust the pressure of the piston-cylinder device to compress the battery core to a target stack compression force.

7. The method according to claim 6, characterized in that The positioning device includes at least one of a tension bar, a tension belt and a pull rod.

8. A fuel cell vehicle, characterized in that: include: A fuel cell stack as described in any one of claims 1 to 5 or a fuel cell stack prepared by the method as described in any one of claims 6 to 7.

9. The fuel cell vehicle according to claim 8, characterized in that: Also includes: A third end plate is arranged on a side of the piston-cylinder device away from the battery core.

10. The fuel cell vehicle according to claim 9, characterized in that: Also included: a tension device, the tension device is arranged on the third end plate, and is used to prevent the pressure of the fuel cell stack from decreasing; and / or a locking device, one end of which is connected to the first end plate, and the other end of which is connected to the third end plate, so as to achieve a fixed interval between the first end plate and the third end plate; And / or, it also includes: a sealing portion is provided on the second end plate, and the sealing portion is conformable to the structure of a part of the piston-cylinder device to prevent pressure leakage of the piston-cylinder device.

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