Fuel cell stack pressing device

Abstract

The utility model relates to the field of fuel cell stack design, and discloses a fuel cell stack pressing device which comprises a stack loading platform, the plurality of limiting rods are arranged on the upper surface of the pile loading platform, and each limiting rod comprises a contact surface which is in contact with the surface of the electric pile; the pressure sensor monitors the pressure between the contact surface of the limiting rod and the surface of the galvanic pile and the surface of the galvanic pile; the permanent magnets are arranged on the opposite surfaces of the contact surfaces of the limiting rods and the surface of the electric pile, and are arranged along the vertical direction of the limiting rods; an electromagnet; electromagnets are arranged on the opposite faces of the surfaces, provided with the permanent magnets, of the electromagnet fixing rod and the limiting rod, so that the permanent magnets and the electromagnets are oppositely arranged and partially coincide with one another. The control system is connected with the pressure sensors and the electromagnets, and the control system is used for adjusting the current direction and the current magnitude of the corresponding electromagnets in real time according to the pressure monitored by the pressure sensors. The utility model can improve the stacking precision of the electric pile and improve the stacking success rate.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell stack assembly, in particular to a fuel cell stack pressing device. Background Art

[0002] A fuel cell is a device that converts the chemical energy of reactants into electrical energy. It has the characteristics of high power generation efficiency, low environmental pollution, high specific energy, and high reliability. A fuel cell stack is composed of core components of the stack, such as end plates, insulating plates, current collectors, bipolar plates, and membrane electrodes, stacked one by one. The stacking and assembly of the stack is usually completed on a stacking machine. When assembling the stack, in order to ensure the accuracy of the stack, it is necessary to limit the stack during assembly. The current common limiting method is to use internal or external limiting, or use internal and external limiting at the same time. However, when the stack height is too high, the length of the limiting rod needs to be lengthened accordingly. The longer the length of the rod, the more difficult it is to ensure the straightness of the rod. If the straightness of the rod is too low, it will cause material deviation, reduce the stack assembly accuracy, and cause the stack performance to deteriorate. It may even cause the material to curl, resulting in material damage or short circuit of the stack during testing. In view of the above problems, it is very necessary to study and design a new type of fuel cell stack pressing device to overcome the problems existing in existing fuel cells. Utility Model Content

[0003] In order to solve the problem that during the existing fuel cell stack pressing operation, when the stack height is too high, the existing limit rod will cause the material to shift, resulting in lower stacking accuracy, worse stack performance and damage to the curling edge of the material, the utility model provides a fuel cell stack pressing device.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a fuel cell stack pressing device, including a stacking platform;

[0005] A limiting rod, wherein the limiting rod is multiple and the multiple limiting rods are all arranged on the upper surface of the stacking platform, and each limiting rod includes a contact surface with the surface of the battery stack;

[0006] A pressure sensor, the pressure sensor monitoring the pressure between the contact surface of the limit rod and the surface of the battery stack and the surface of the battery stack;

[0007] Permanent magnets, which are arranged on the surface of each of the limit rods opposite to the contact surface with the surface of the battery stack, and are arranged along the vertical direction of the limit rods;

[0008] Electromagnet;

[0009] An electromagnet fixing rod, wherein the electromagnet is arranged on a surface opposite to the surface of the limiting rod on which the permanent magnet is arranged, so that the permanent magnet and the electromagnet are arranged opposite to each other and have a partial overlap of opposite surfaces;

[0010] A control system is connected to the pressure sensor and the electromagnet, and is used to adjust the current direction and current magnitude of the corresponding electromagnet in real time according to the pressure monitored by the pressure sensor.

[0011] According to a fuel cell stack pressing device in some embodiments of the utility model, a slide rail is provided on the upper surface of the stacking platform, and the limit rod is connected to the slide rail.

[0012] According to a fuel cell stack pressing device of some embodiments of the present invention, the pressure sensor is embedded in the side of the limit rod close to the stack, and the surface of the pressure sensor is flush with the surface of the limit rod close to the stack.

[0013] According to a fuel cell stack pressing device in some embodiments of the present invention, the pressure sensors are arranged equidistantly in the vertical direction of the limiting rod.

[0014] According to a fuel cell stack pressing device in some embodiments of the present invention, the permanent magnets are arranged equidistantly in the vertical direction of the limiting rod.

[0015] According to a fuel cell stack pressing device of some embodiments of the present invention, the electromagnets are arranged equidistantly along the vertical direction of the electromagnet fixing rods, and the electromagnet fixing rods are arranged on the upper surface of the stacking platform.

[0016] According to a fuel cell stack pressing device of some embodiments of the utility model, the number of the pressure sensors, permanent magnets and electromagnets is the same, the pressure sensors correspond to the permanent magnets in one-to-one horizontal height, and the permanent magnets correspond to the electromagnets in one-to-one horizontal height.

[0017] According to a fuel cell stack pressing device in some embodiments of the present invention, the limit rod is connected to the control system, and the control system is used to control the position of the limit rod on the stacking platform.

[0018] According to some embodiments of the present invention, a fuel cell stack pressing device further includes a pressure head, which is arranged above the stack and connected to the control system, and the control system is used to control the rise, fall and movement speed of the pressure head.

[0019] According to some embodiments of the present invention, a fuel cell stack pressing device is provided, wherein the stack is a proton exchange membrane fuel cell stack.

[0020] The utility model discloses a fuel cell stack pressing device. The control system monitors the pressure value between the limit rod and the stack material at all times through the pressure sensor, judges the shape of the limit rod, compares the measured pressure value with the specified pressure value, adjusts the current direction and size in the electromagnet at the rear side of the limit rod according to the ratio, corrects the shape of the limit rod, ensures the stacking accuracy of the stack material during the stack pressing process, prevents the deviation of the stack material, and avoids the curling of the stack material. It can not only improve the stacking accuracy of the stack material, but also improve the success rate of stack pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the position limiting tooling and the battery stack of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of a limit rod and an electromagnet fixing rod in an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the control system structure of the utility model embodiment.

[0024] In the figure: 1. loading platform, 2. limit rod, 3. pressure sensor, 4. permanent magnet, 5. electromagnet fixing rod, 6. electromagnet, 7. control system, 8. slide rail, 9. pressure head, 10. upper end plate, 11. core, 12. lower end plate. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0026] In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0027] A fuel cell stack pressing device according to this embodiment, such as Figure 1-Figure 3 As shown, it includes a stacking platform 1; a limit rod 2, which is a plurality of limit rods 2 and are all arranged on the upper surface of the stacking platform 1, and each limit rod 2 includes a contact surface with the surface of the battery stack; a pressure sensor 3, which monitors the contact surface between the limit rod 2 and the surface of the battery stack and the pressure between the surfaces of the battery stack; a permanent magnet 4, which is arranged on the opposite side of the contact surface of each limit rod 2 with the surface of the battery stack, and is arranged along the vertical direction of the limit rod 2; an electromagnet 6; an electromagnet fixing rod 5, which is arranged on the opposite side of the surface of the electromagnet fixing rod 5 and the limit rod 2 where the permanent magnet 4 is arranged, so that the permanent magnet 4 and the electromagnet 6 are arranged opposite to each other and have some relative surfaces overlapped; a control system 7, which is arranged at the control system 7 and The pressure sensor 3 is connected to the electromagnet 6, and the control system 7 is used to adjust the current direction and current size of the corresponding electromagnet 6 in real time according to the pressure monitored by the pressure sensor 3. Specifically, the control system 7 compares the measured pressure value transmitted by the pressure sensor 3 with the standard pressure range, and adjusts the current of the electromagnet 6 corresponding to the point beyond the standard range. The control system 7 controls the direction and size of the current in the coil of the electromagnet 6, and then controls the size and direction of the force between the electromagnet 6 and the permanent magnet 4, until the size of the pressure transmitted back by the pressure sensor 3 at the point beyond the standard range returns to the standard pressure range. By adjusting the electromagnet 6, the force condition of the limit rod 2 is adjusted to improve the stacking accuracy of the battery stack.

[0028] The upper surface of the stacking platform 1 is provided with a slide rail 8, and the limit rod 2 is connected to the slide rail 8. The slide rail 8 can make the limit rod 2 move better on the stacking platform 1, so that the stacking device can be suitable for stacking fuel cell stacks of different sizes. The limit rod 2 can also be connected to the control system 7, and the control system 7 is used to control the position of the limit rod 2 on the stacking platform 1. In addition, the number of slide rails 8 and limit rods 2 can be adjusted according to the size of the fuel cell stack.

[0029] like Figure 2 As shown, the pressure sensor 3 is embedded in the side of the limit rod 2 close to the fuel cell stack, and the surface of the pressure sensor 3 is flush with the surface of the limit rod 2 close to the fuel cell stack, so that it will not interfere with the stacking of the fuel cell stack. When the stacking operation is performed, the side of the fuel cell stack directly contacts the pressure sensor 3, and the pressure sensor 3 will collect pressure values ​​at different positions of the fuel cell stack. When the limit rod 2 bends toward the fuel cell stack, the contact between the fuel cell stack and the pressure sensor 3 is relatively close, and the pressure value detected by the pressure sensor 3 is relatively large. When the limit rod 2 bends in the opposite direction of the fuel cell stack, the pressure value detected by the pressure sensor 3 is relatively small.

[0030] like Figure 2As shown, the pressure sensors 3 are arranged equidistantly along the limit rod 2 in the vertical direction, the distance between the pressure sensor 3 at the bottom and the upper surface of the stacking platform 1 is d1, and the distance between the two pressure sensors 3 is d2. The electromagnets 6 are arranged equidistantly along the electromagnet fixing rod 5 in the vertical direction, the distance between the permanent magnet 4 at the bottom and the upper surface of the stacking platform 1 is d1, and the distance between the two permanent magnets 4 is d2. The electromagnets 6 are arranged equidistantly along the limit rod 2 in the vertical direction, the distance between the electromagnet 6 at the bottom and the upper surface of the stacking platform 1 is d1, and the distance between the two electromagnets 6 is d2. The electromagnet fixing rod 5 is set on the upper surface of the stacking platform 1. The number of pressure sensors 3, permanent magnets 4 and electromagnets 6 is the same, the pressure sensors 3 correspond to the permanent magnets 4 in horizontal height, and the permanent magnets 4 correspond to the electromagnets 6 in horizontal height.

[0031] The device also includes a pressure head 9, which is arranged above the battery stack and connected to the control system 7. The control system 7 is used to control the rise, fall and movement speed of the pressure head 9. The pressure head 9 is used to apply pressure to the entire battery stack, and finally the entire battery stack is pressed to a certain height. In this embodiment, the battery stack can be a proton exchange membrane fuel cell stack, and the fuel cell stack pressing device is a proton exchange membrane fuel cell stack pressing device. During the fuel cell stack pressing process, as the pressure head 9 is pressed down, the battery stack material will be squeezed laterally on the limit rod 2. The pressure sensor 3 located on the limit rod 2 monitors the pressure on the rod from time to time, and transmits the pressure data to the control system 7. The control system 7 will compare the measured pressure value with the specified pressure value, and adjust the current direction and size in the coil of the electromagnet 6 on the rear side of the limit rod 2 according to the ratio, and correct the shape of the limit rod 2. The fuel cell stack to be pressed includes a lower end plate 12, a core 11 and an upper end plate 10. During pressing, the lower end plate 12 is directly placed on the loading platform 1. The core 11 is composed of materials such as bipolar plates and membrane electrodes stacked in a prescribed order. The upper end plate 10 is located above the core 11. The lower end plate 12, the core 11 and the upper end plate 10 must be pressed under the limit of the limit rod 2 during pressing, which can avoid deviation, improve the stacking accuracy, and also improve the success rate of stack pressing.

[0032] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A fuel cell stack pressing device, characterized in that: include Stacking platform (1); A limiting rod (2), wherein the limiting rod (2) is multiple and the multiple limiting rods (2) are all arranged on the upper surface of the stacking platform (1), and each limiting rod (2) comprises a contact surface with the surface of the battery stack; A pressure sensor (3), the pressure sensor (3) monitoring the contact surface between the limit rod (2) and the surface of the battery stack and the pressure between the surface of the battery stack; A permanent magnet (4), the permanent magnet (4) being arranged on a surface of each of the limiting rods (2) opposite to a contact surface with the surface of the battery stack, and being arranged in a vertical direction along the limiting rods (2); Electromagnet (6); An electromagnet fixing rod (5), wherein the electromagnet (6) is arranged on a surface opposite to the surface of the electromagnet fixing rod (5) and the limiting rod (2) on which the permanent magnet (4) is arranged, so that the permanent magnet (4) and the electromagnet (6) are arranged opposite to each other and have a partial overlap of opposite surfaces; A control system (7), wherein the control system (7) is connected to the pressure sensor (3) and the electromagnet (6), and the control system (7) is used to adjust the current direction and current magnitude of the corresponding electromagnet (6) in real time according to the pressure monitored by the pressure sensor (3).

2. A fuel cell stack pressing device according to claim 1, characterized in that: The upper surface of the stacking platform (1) is provided with a slide rail (8), and the limiting rod (2) is connected to the slide rail (8).

3. A fuel cell stack pressing device according to claim 1, characterized in that: The pressure sensor (3) is embedded in the limiting rod (2) on a side close to the fuel cell stack, and the surface of the pressure sensor (3) is flush with the surface of the limiting rod (2) on a side close to the fuel cell stack.

4. A fuel cell stack pressing device according to claim 1, characterized in that: The pressure sensors (3) are arranged at equal distances in the vertical direction of the limiting rod (2).

5. A fuel cell stack pressing device according to claim 4, characterized in that: The permanent magnets (4) are arranged at equal distances in the vertical direction of the limiting rod (2).

6. A fuel cell stack pressing device according to claim 5, characterized in that: The electromagnets (6) are arranged equidistantly in the vertical direction of the electromagnet fixing rod (5), and the electromagnet fixing rod (5) is arranged on the upper surface of the stacking platform (1).

7. A fuel cell stack pressing device according to claim 6, characterized in that: The number of the pressure sensors (3), permanent magnets (4) and electromagnets (6) is the same; the pressure sensors (3) and the permanent magnets (4) correspond one to one in terms of horizontal height; and the permanent magnets (4) and the electromagnets (6) correspond one to one in terms of horizontal height.

8. A fuel cell stack pressing device according to claim 1, characterized in that: The limiting rod (2) is connected to the control system (7), and the control system (7) is used to control the position of the limiting rod (2) on the stacking platform (1).

9. A fuel cell stack pressing device according to claim 1, characterized in that: It also includes a pressure head (9), which is arranged above the battery stack and connected to the control system (7), and the control system (7) is used to control the rise, fall and movement speed of the pressure head (9).

10. A fuel cell stack pressing device according to claim 1, characterized in that: The fuel cell stack is a proton exchange membrane fuel cell stack.

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