Fast-assembly fuel cell stack structure suitable for long-term durability test

Abstract

The utility model discloses a fuel cell stack structure capable of being assembled quickly and suitable for long-term durability test, which comprises a reactor core, a front end plate and a rear end plate, the front end plate and the rear end plate are positioned on the front side and the rear side of the reactor core, a gas distribution plate is arranged on the front end plate, a hydraulic cylinder is arranged on the outer side of the rear end plate, and the hydraulic cylinder is provided with a cylinder body and a piston rod. The piston rod abuts against the rear end plate, and the front end plate, the reactor core, the rear end plate and the cylinder body are connected in series through a screw rod and are locked and fixed through a locking nut matched with the screw rod. According to the fuel cell stack structure disclosed by the utility model, the hydraulic cylinder is arranged on one side of the stack structure, so that when a stack is pressed, the stack can be quickly loaded only by injecting high-pressure water into the hydraulic cylinder. After the galvanic pile is pressed, the piston rod of the hydraulic cylinder applies pressure to the rear end plate, the stress balance depends on the stress balance of liquid in the hydraulic cylinder, and the stress balance of the liquid can realize self-adaption through self deformation, so that the stress self-adaption of the galvanic pile is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel cells, and in particular relates to a fuel cell stack structure which is quick to assemble and suitable for long-term durability testing. Background Art

[0002] At present, the fixtures used for testing short stacks in the fuel cell industry are generally screw-type structures, and assembly can only be completed under the condition of a press. Stack assembly is particularly inconvenient and the stack assembly process is relatively cumbersome. The normal stack pressing time is more than 20 minutes. For screw-type small stacks, the screw-in size of each nut cannot be determined during the locking process, resulting in difficulty in ensuring the force consistency inside the bipolar plate.

[0003] For example, the utility model with the authorization announcement number CN220821647U discloses a plate parallel fuel cell stack, including a core unit, wherein a plurality of parallel fuel cell plates are arranged in the core unit, wherein the parallel fuel cell plates include at least two parallel connected plate units; the two parallel connected plate units are integrally formed, and each of the plate units is independently arranged. The plate parallel fuel cell stack also includes a cover plate, a spring assembly, an insulating plate, a first current collecting plate, a second current collecting plate, a stacking screw and an air intake end plate; the stacking screw is symmetrically arranged on both sides of the core unit, and one end of the stacking screw is fixedly connected to the cover plate, and the other end is fixedly connected to the air intake end plate. Utility Model Content

[0004] The utility model aims at the above-mentioned deficiencies existing in the prior art and provides a fuel cell stack structure which can be assembled quickly and is suitable for long-term durability testing.

[0005] A fuel cell stack structure that can be quickly assembled and is suitable for long-term durability testing, includes a core and a front end plate and a rear end plate located on the front and rear sides of the core, the front end plate is also provided with a gas distribution plate, and the outer side of the rear end plate is also provided with a hydraulic cylinder, the hydraulic cylinder has a cylinder body and a piston rod, the piston rod abuts against the rear end plate, the front end plate, the core, the rear end plate and the cylinder body are connected in series via screws, and are locked and fixed by a locking nut that cooperates with the screw.

[0006] Preferably, the screw rod is provided with the locking nut on the side where the hydraulic cylinder is located.

[0007] More preferably, the hydraulic cylinder is provided with a hydraulic cylinder sealing cover fixed to the cylinder body at an end away from the core, and the locking nut is located outside the hydraulic cylinder sealing cover.

[0008] Further preferably, the end of the piston rod has a support plate for abutting the rear end plate. The size and shape of the end surface of the support plate for abutting the rear end plate are consistent with those of the rear end plate.

[0009] Further preferably, the hydraulic cylinder sealing cover is also provided with a pressure gauge for detecting the internal liquid pressure of the hydraulic cylinder, as well as a liquid inlet valve and an exhaust valve.

[0010] Preferably, insulating plates are provided between the front end plate and the core, and between the rear end plate and the core, respectively; and conductive plates are also provided between the insulating plates and the core on both sides.

[0011] The utility model fuel cell stack structure has a hydraulic cylinder arranged on one side of the stack structure. When the stack is compressed, only high-pressure water needs to be injected into the hydraulic cylinder to achieve rapid stacking. After the stack is compressed, the piston rod of the hydraulic cylinder applies pressure to the rear end plate, and its force balance depends on the force balance of the liquid inside the hydraulic cylinder. The force balance of the liquid can be self-adapted through its own deformation, thereby achieving self-adaptation of the stack force. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the fuel cell stack structure of the utility model.

[0013] Figure 2 It is a structural schematic diagram of the fuel cell stack structure of the utility model during the stacking process.

[0014] Reference numerals: core 1, front end plate 2, rear end plate 3, gas distribution plate 4,

[0015] Hydraulic cylinder 5, cylinder body 51, piston rod 52, hydraulic cylinder sealing cover 53, support plate 54, pressure gauge 55, liquid inlet valve 56, exhaust valve 57,

[0016] Screw 6, locking nut 7, insulating plate 8, conductive plate 9,

[0017] Water outlet valve 10, water tank 11, air inlet valve 12, pressure relief valve 13, gas cylinder 14. DETAILED DESCRIPTION

[0018] like Figure 1 As shown, a fuel cell stack structure suitable for long-term durability testing with quick assembly includes a core 1 and a front end plate 2 and a rear end plate 3 located at the front and rear sides of the core 1, and a gas distribution plate 4 is also provided on the front end plate 2. Insulating plates 8 are provided between the front end plate 2 and the core 1, and between the rear end plate 3 and the core 1, respectively, and conductive plates 9 are provided between the insulating plates 8 on both sides and the core 1.

[0019] Two insulating plates 8 close to the end plates are arranged between the two metal end plates (front end plate 2 and rear end plate 3) at both ends, and two conductive plates 9 are arranged on both sides close to the insulating plates. The core 1 arranged between the two conductive plates 9 includes a plurality of fuel cell units composed of bipolar plates and membrane electrodes. The gas distribution plate 4 arranged on the front end plate is provided with inlets and outlets for hydrogen, air and cooling water for water cooling.

[0020] A hydraulic cylinder 5 is also provided on the outside of the rear end plate 3. The hydraulic cylinder 5 has a cylinder body 51 and a piston rod 52. The piston rod 52 presses against the rear end plate 3. The front end plate 2, the core 1, the rear end plate 3 and the cylinder body 51 are connected in series through a screw rod 6 and are locked and fixed by a locking nut 7 that cooperates with the screw rod 6.

[0021] The screw rod 6 has a screw head on one side of the front end plate 2, and the corresponding mounting hole on the front end plate 2 for the screw rod 6 to pass through can be designed as a countersunk hole, so that the screw head of the screw rod 6 can be hidden in the countersunk hole and does not protrude from the outer surface of the front end plate 2. The screw rod 6 is provided with a locking nut 7 on the side where the hydraulic cylinder 5 is located, and the locking pressure of the entire stack is ensured by adjusting the locking nut 7.

[0022] The screw 6 is arranged around the outer circumference of the battery stack, and multiple screws can be arranged as needed.

[0023] The hydraulic cylinder 5 is provided with a hydraulic cylinder sealing cover 53 fixed to the cylinder body 51 at one end away from the core 1 , and a sealing ring is provided on the interface between the hydraulic cylinder sealing cover 53 and the cylinder body 51 to ensure the sealing effect. The locking nut 7 is located outside the hydraulic cylinder sealing cover 53 .

[0024] The end of the piston rod 52 has a support plate 54 that abuts against the rear end plate 3. The size and shape of the end face of the support plate 54 used to abut against the rear end plate 3 are consistent with the rear end plate 3. In other words, the support plate 54 applies pressure to the rear end plate 3, so the shape and size of the end face of the support plate 54 are designed to be consistent with the rear end plate 3 to ensure pressure dispersion while maintaining aesthetics. Furthermore, the shape of the cylinder body 51 and the shape and size of the hydraulic cylinder sealing cover 53 are also consistent with the support plate 54 and the rear end plate 3, so that the overall structure of the battery stack remains neat and beautiful.

[0025] The hydraulic cylinder sealing cover 53 is also provided with a pressure gauge 55 for detecting the pressure of the liquid inside the hydraulic cylinder 5, as well as a liquid inlet valve 56 and an exhaust valve 57. In the present application, the liquid used in the hydraulic cylinder 5 can be water. The liquid inlet valve 56 is used to inlet liquid, that is, water, and the exhaust valve 57 is used to exhaust the gas inside the cylinder body 51 when water is inlet.

[0026] like Figure 2As shown, after the stacking and assembly of the battery stack structure is completed, each locking nut 7 is rotated to contact the hydraulic cylinder sealing cover 53, and then a pipe is used to connect the liquid inlet valve 56 to the water outlet valve 10 on the water tank 11 used for liquid inlet. The top surface of the water tank 11 has an air inlet valve 12, and the air inlet valve 12 is connected to a high-pressure gas cylinder 14 through an air pipe. The air inlet valve 12, the water outlet valve 10, the liquid inlet valve 56, and the exhaust valve 57 are opened, and the water in the water tank 11 is pressed into the hydraulic cylinder 5 by the high-pressure gas. When no gas is discharged from the exhaust valve 57, the exhaust valve 57 is closed. When water continues to be pressed into the hydraulic cylinder 5, the liquid pressure in the hydraulic cylinder 5 increases, and the pressure gauge 55 is observed until the pressure reaches the set value, and then the liquid inlet valve 56 and the air inlet valve 12 are closed, and the pressure relief valve 13 on the water tank 11 is opened to relieve the pressure, and then the pipe is removed to complete the assembly of the battery stack.

Claims

1. A fuel cell stack structure suitable for long-term durability testing with quick assembly, comprising a core and a front end plate and a rear end plate located at the front and rear sides of the core, wherein a gas distribution plate is also provided on the front end plate, characterized in that: A hydraulic cylinder is also provided on the outside of the rear end plate. The hydraulic cylinder has a cylinder body and a piston rod. The piston rod abuts against the rear end plate. The front end plate, the core, the rear end plate and the cylinder body are connected in series through screws and are locked and fixed by a locking nut that cooperates with the screw.

2. The fuel cell stack structure for quick assembly suitable for long-term durability testing according to claim 1, characterized in that: The screw rod is provided with the locking nut on the side where the hydraulic cylinder is located.

3. The fuel cell stack structure for quick assembly suitable for long-term durability testing according to claim 2, characterized in that: The hydraulic cylinder is provided with a hydraulic cylinder sealing cover fixed to the cylinder body at one end away from the core, and the locking nut is located outside the hydraulic cylinder sealing cover.

4. The fuel cell stack structure for quick assembly suitable for long-term durability testing according to claim 3, characterized in that: The end of the piston rod has a support plate that abuts against the rear end plate.

5. The fuel cell stack structure for quick assembly suitable for long-term durability testing according to claim 4, characterized in that: The size and shape of the end surface of the support plate used to abut against the rear end plate are consistent with those of the rear end plate.

6. The fuel cell stack structure for quick assembly suitable for long-term durability testing according to claim 3, characterized in that: The hydraulic cylinder sealing cover is also provided with a pressure gauge for detecting the internal liquid pressure of the hydraulic cylinder, as well as a liquid inlet valve and an exhaust valve.

7. The fuel cell stack structure for quick assembly suitable for long-term durability testing according to claim 1, characterized in that: Insulating plates are respectively arranged between the front end plate and the core, and between the rear end plate and the core; and conductive plates are also arranged between the insulating plates and the core on both sides.

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