Packaging assembly and packaging method for galvanic pile

Abstract

The invention discloses a packaging assembly and a packaging method for a galvanic pile, and relates to the technical field of galvanic pile packaging, the packaging assembly comprises two mounting rod bodies, a connecting piece, a first connecting piece and a second connecting piece, the mounting rod bodies are used for being fixed on a base of the galvanic pile, and the two mounting rod bodies both extend in a first direction and are parallel to each other; the connecting piece is suitable for being connected between the two mounting rod bodies, the two mounting rod bodies are located on the two opposite sides of the galvanic pile in the second direction under the condition that the galvanic pile is compressed, the two mounting rod bodies are suitable for being fixed to the base, and the connecting piece is bent along the surface of the galvanic pile and abuts against the galvanic pile to package the galvanic pile; the connector is configured to be elongated before the stack is packaged, and the first direction is perpendicular to the second direction. Therefore, the length change probability of the connecting piece during packaging can be reduced, the influence of the length tolerance of the connecting piece on the distribution uniformity of packaging force can be reduced, the packaging force attenuation of the connecting piece during galvanic pile packaging can be avoided, and a relatively good packaging effect can be realized.

Description

Technical Field

[0001] This invention relates to the field of fuel cell stack packaging technology, and in particular to a packaging component and packaging method for fuel cell stacks. Background Technology

[0002] Among related technologies, fuel cells, as a highly efficient and clean energy conversion device, will inevitably be widely used in the field of mobility in the future, with breakthroughs in key technologies. The fuel cell stack, as the core component of a fuel cell, is composed of multiple electrode plates, membrane electrode assemblies, and other components stacked and pressed together, requiring encapsulation. However, the assembly effect and consistency of the existing fuel cell stack encapsulation components still need improvement, negatively impacting the stack's performance, consistency, and production cycle. This can easily lead to assembly errors and affect the uniformity of the stack's encapsulation force distribution. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a packaging assembly for fuel cell stacks that can reduce the probability of changes in the length of the connectors during packaging, reduce the influence of connector length tolerance on the uniformity of packaging force distribution, and also avoid the attenuation of packaging force during the packaging of the fuel cell stack, thereby achieving better packaging effect.

[0004] The present invention further proposes a packaging method for the above-mentioned packaging components.

[0005] An assembly for a fuel cell stack according to an embodiment of the present invention is characterized in that the assembly comprises: Two mounting rods are used to fix the fuel cell stack to its base. Both mounting rods extend along a first direction and are parallel to each other. A connector adapted to be connected between two mounting rods, wherein, in the case of complete stack compression, the two mounting rods are located on opposite sides of the stack along a second direction and are adapted to be fixed to a base, the connector is bent along the surface of the stack and abuts against the stack to encapsulate the stack, the connector is configured to be elongated before encapsulating the stack, and the first and second directions are perpendicular.

[0006] According to an embodiment of the present invention, a packaging assembly for a fuel cell stack includes two mounting rods for fixing to the base of the fuel cell stack. Both mounting rods extend along a first direction and are parallel to each other. A connector is adapted to connect between the two mounting rods. This ensures that the connector will not shift during fuel cell stack packaging and eliminates the need for punching holes at both ends of the connector, reducing production costs, increasing strength, and minimizing sealing force attenuation. Stretching the connector before fuel cell stack packaging (applying a load exceeding the yield strength of the connector material and stabilizing it for a period of time) causes plastic deformation and work hardening (cold drawing), reducing the probability of length changes during packaging. This reduces the impact of connector length tolerances on the uniformity of sealing force distribution and prevents sealing force attenuation during fuel cell stack packaging, resulting in better packaging performance.

[0007] According to some embodiments of the present invention, the connector includes a plurality of straps arranged sequentially along a first direction, and each strap connects two mounting rods.

[0008] In some embodiments of the present invention, multiple straps are of the same length.

[0009] In some embodiments of the present invention, any two adjacent straps are spaced at the same distance along the first direction.

[0010] According to some embodiments of the present invention, each strap has through holes formed at both ends for the corresponding mounting rod to pass through in a first direction.

[0011] In some embodiments of the invention, the through hole is formed by winding the end of a strap.

[0012] According to some embodiments of the present invention, the mounting rod has a plurality of mounting portions arranged sequentially along the extension direction of the mounting rod, and the mounting rod is fixedly connected to the fuel cell stack through the mounting portions. In some embodiments of the present invention, the mounting portion is formed with mounting holes for fasteners to pass through.

[0013] In some embodiments of the present invention, the two mounting rods have identical structures.

[0014] According to an embodiment of the present invention, a packaging method for an electric stack, using the packaging components described above, includes the following: Connect the connector between the two mounting rods; A tensile load is applied to the connector to elongate it; A mounting rod is fixed to the base of the fuel cell stack; Bend and tighten the connector along the surface of the fuel cell stack, and fix another mounting rod to the base; Verify the fixing torque of the two mounting rods; Raise the pressure head used to compress the fuel cell stack.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the packaging component according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the assembly of the packaging component and the fuel cell stack according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating the encapsulation method according to an embodiment of the present invention.

[0017] Figure label: Encapsulated component 100; Mounting rod 10; Mounting part 11; Connector 20; Strap 21; Through hole 22; Fuel cell stack 200; base 201. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] The following is for reference. Figures 1-3 The present invention describes a packaging assembly 100 and a packaging method for a fuel cell stack 200 according to an embodiment of the present invention.

[0020] According to an embodiment of the present invention, a packaging assembly 100 for a fuel cell stack 200 includes: Two mounting rods 10 are used to fix the fuel cell stack 200 to the base 201. Both mounting rods 10 extend along the first direction and are parallel to each other. A connector 20 is adapted to be connected between two mounting rods 10. When the fuel cell stack 200 is compressed, the two mounting rods 10 are located on opposite sides of the fuel cell stack 200 along the second direction, and the two mounting rods 10 are adapted to be fixed to the base 201. The connector 20 is bent along the surface of the fuel cell stack 200 and abuts against the fuel cell stack 200 to encapsulate the fuel cell stack 200. The connector 20 is configured to be elongated before encapsulating the fuel cell stack 200, and the first direction and the second direction are perpendicular.

[0021] Among them, such as Figure 2 As shown, the first direction is the X-axis, and the second direction is the Y-axis, which are perpendicular to each other. Two mounting rods 10 are used to fix the fuel cell stack 200 to its base 201. Both mounting rods 10 extend along the first direction and are parallel to each other. A connector 20 is adapted to connect between the two mounting rods 10, ensuring that the connector 20 does not shift during fuel cell stack 200 encapsulation. Furthermore, it eliminates the need for punching holes at both ends of the connector 20, reducing production costs, increasing strength, and minimizing the attenuation of encapsulation force.

[0022] When the fuel cell stack 200 is compressed, along the second direction, two mounting rods 10 are located on opposite sides of the fuel cell stack 200, and the two mounting rods 10 are adapted to be fixed to the base 201. The connector 20 is bent along the surface of the fuel cell stack 200 and abuts against the fuel cell stack 200 to encapsulate the fuel cell stack 200. The connector 20 is configured to be elongated before encapsulating the fuel cell stack 200. Specifically, the connector 20 is a metal part. Elongating the connector 20 before encapsulating the fuel cell stack 200 (referring to applying a load exceeding the yield strength of the connector 20 material to the connector 20 and stabilizing it for a period of time) can cause the connector 20 to undergo plastic deformation and work hardening (cold drawing), thereby increasing the strength of the connector 20. This can reduce the probability of the length of the connector 20 changing during encapsulation, reduce the influence of the length tolerance of the connector 20 on the uniformity of the encapsulation force distribution, and also avoid the attenuation of the encapsulation force of the connector 20 when encapsulating the fuel cell stack 200, thus achieving a better encapsulation effect.

[0023] According to an embodiment of the present invention, the encapsulation assembly 100 for a fuel cell stack 200 includes two mounting rods 10 for fixing to the base 201 of the fuel cell stack 200. Both mounting rods 10 extend along a first direction and are parallel to each other. A connector 20 is adapted to connect between the two mounting rods 10. This ensures that the connector 20 does not shift during fuel cell stack encapsulation and eliminates the need for punching holes at both ends of the connector 20, reducing production costs, increasing strength, and minimizing encapsulation force attenuation. Stretching the connector 20 before encapsulating the fuel cell stack 200 (meaning applying a load exceeding the yield strength of the connector 20 material and stabilizing it for a period of time) causes plastic deformation and work hardening (cold drawing), reducing the probability of length changes during encapsulation. This reduces the impact of connector length tolerance on the uniformity of encapsulation force distribution and prevents encapsulation force attenuation during fuel cell stack encapsulation, achieving a better encapsulation effect.

[0024] According to some embodiments of the present invention, such as Figure 1 and 2 As shown, the connector 20 includes multiple straps 21, which are arranged sequentially along the first direction, and each strap 21 connects to two mounting rods 10.

[0025] The connector 20 includes a plurality of straps 21. In some embodiments of the present invention, the connector 20 may include two, three, four or other numbers of straps 21, but the present invention is not limited thereto. The connector 20 may also include other numbers of straps 21, as long as the connector 20 includes a plurality of straps 21.

[0026] Multiple straps 21 are arranged sequentially along the first direction, and each strap 21 is connected between two mounting rods 10. This enables a more uniform contact pressure distribution between the connector 20 and the fuel cell stack 200, which is beneficial to improving the uniformity of the encapsulation force of the encapsulation component 100 and further improving the overall performance of the fuel cell stack 200.

[0027] According to some embodiments of the present invention, such as Figure 2 As shown, the multiple straps 21 have the same length, which can reduce the impact of the strap length tolerance on the uniformity of the packaging force distribution. This ensures that the contact pressure between each strap 21 and the fuel cell stack 200 is the same, which can further improve the uniformity of the packaging force of the packaging component 100 and further improve the overall performance of the fuel cell stack 200.

[0028] According to some embodiments of the present invention, such as Figure 2 As shown, any two adjacent straps 21 have the same spacing along the first direction.

[0029] The equidistant spacing between any two adjacent straps 21 along the first direction ensures the uniformity and continuity of pressure distribution on the fuel cell stack 200. This also prevents the base 201 of the fuel cell stack 200 from warping or deforming due to uneven stress, maintaining the flatness of the base 201. The equidistant design creates a symmetrical load path, with all straps 21 working collaboratively to resist the outward tension generated by the expansion of the internal components of the fuel cell stack 200. This symmetry makes the encapsulation assembly 100 structure more stable and less prone to twisting or instability. It also simplifies the design and manufacturing process of the encapsulation assembly 100.

[0030] According to some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, each strap 21 has through holes 22 at both ends for the corresponding mounting rod 10 to pass through in the first direction.

[0031] Each strap 21 has through holes 22 at both ends for the corresponding mounting rod 10 to pass through in a first direction. For example, the through holes 22 are formed by winding the ends of the strap 21, or by directly punching holes at both ends of the strap 21, or by adding mounting ends with through holes 22 at both ends of the strap 21. However, the present invention is not limited to these, and other forms of through holes 22 can also be formed at both ends of the strap 21, which can be reasonably selected and set according to the actual situation. As a specific embodiment of the present invention, the through holes 22 are formed by winding the ends of the strap 21. This setting can easily connect multiple straps 21 between two mounting rods 10 without punching holes in the straps 21, which can improve the structural strength of the straps 21, thereby reducing the attenuation of the sealing force of the straps 21 when encapsulating the fuel cell stack 200, which is beneficial to improving the performance consistency of the fuel cell stack 200. It can also reduce the production difficulty of the straps 21.

[0032] According to some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the through hole 22 is formed by winding the end of the strap 21. This design eliminates the need for drilling holes in the strap 21, thereby increasing the structural strength of the strap 21 and reducing the attenuation of the sealing force when the strap 21 is used to encapsulate the fuel cell stack 200. This is beneficial for improving the performance consistency of the fuel cell stack 200. It also reduces the manufacturing difficulty of the strap 21.

[0033] According to some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the mounting rod 10 has a plurality of mounting portions 11, which are arranged sequentially along the extension direction of the mounting rod 10. The mounting rod 10 is fixedly connected to the fuel cell stack 200 through the mounting portions 11. The mounting rod 10 has multiple mounting portions 11. In some embodiments of the present invention, the mounting rod 10 may have two, three, four, or other numbers of mounting portions 11. However, the present invention is not limited to this, and the mounting rod 10 may also have other numbers of mounting portions 11, as long as the mounting rod 10 has multiple mounting portions 11. The number of mounting portions 11 can be reasonably set according to the length of the mounting rod 10. The multiple mounting portions 11 are arranged sequentially along the extension direction of the mounting rod 10, and the mounting rod 10 is fixedly connected to the fuel cell stack 200 through the mounting portions 11. This uniformly disperses the stress distribution on the mounting rod 10, thereby effectively ensuring the encapsulation performance of the encapsulation assembly 100 on the fuel cell stack 200.

[0034] According to some embodiments of the present invention, the mounting portion 11 is formed with a mounting hole for fasteners to pass through.

[0035] The mounting part 11 may have mounting holes for fasteners to pass through, thereby enabling the mounting rods 10 to be fixed to the base 201 of the fuel cell stack 200 by fasteners, so that the straps 21 between the two mounting rods 10 apply pressure to the fuel cell stack 200.

[0036] Fasteners can be bolts, pins, or other types of fasteners, and can be selected and set appropriately according to the actual situation.

[0037] In some embodiments of the present invention, the two mounting rods 10 have the same structure, which can ensure that the tension of the two mounting rods 10 on the strap 21 is consistent, and can ensure that the pre-tightening force applied by the encapsulation assembly 100 to the fuel cell stack 200 is consistent and uniform. The same clamping force ensures that the contact resistance between all bipolar plates and membrane electrodes is highly consistent, thereby making the voltage output of each cell inside the fuel cell stack 200 very uniform, avoiding the "short board effect" caused by uneven pressure, and ensuring the consistency and reliability of the performance of the fuel cell stack 200.

[0038] Furthermore, both mounting rods 10 can be constructed as cylinders. This configuration reduces the friction between the mounting rods 10 and the strap 21, and prevents the sharp edges of the mounting rods 10 from cutting the strap 21, effectively improving the service life, safety, and reliability of the encapsulation assembly 100.

[0039] like Figure 3 As shown, according to an embodiment of the present invention, a packaging method for an electric stack, using the packaging components of the above embodiments, includes the following: S1, Connect the connector between the two mounting rods; Specifically, the connector is connected between two mounting rods. Each strap is wound at both ends to form through holes, and the two mounting rods are sequentially inserted into the corresponding through holes of the multiple straps to connect the two ends of each strap to the two mounting rods to assemble the encapsulation component.

[0040] S2, apply a tensile load to the connector to elongate it; Preloading methods for connectors can be divided into two types: force loading and displacement loading. Force loading requires controlled plastic deformation of the straps. The required tensile force is determined based on the strap's yield strength and cross-sectional dimensions to apply a tensile load to each strap, causing the connector to elongate. Alternatively, displacement loading can accurately identify the plastic deformation stage, effectively preventing excessive hardening of the straps.

[0041] Both the preload force and preload displacement can be calibrated through a tensile test of the strap. By analyzing the stress-strain curve and force-displacement curve of the strap through a tensile test of the metal strap, the yield point of the strap structure can be obtained, and the magnitude of the force and displacement at the beginning of the plastic deformation stage can be accurately identified.

[0042] Preloading the straps can improve their strength and reduce deformation after the pressure head is lifted, thereby reducing the attenuation of the sealing force and indirectly improving the consistency of the fuel cell stack performance. Furthermore, plastic deformation can eliminate length tolerances between different straps, which helps improve the uniformity of the sealing force distribution, thus enhancing fuel cell stack performance.

[0043] S3, fix a mounting rod to the base of the fuel cell stack; In the process of encapsulating the fuel cell stack, a mounting rod is fixed to the base of the fuel cell stack. The mounting rod can be fixed by bolts, but the present invention is not limited to this. The mounting rod can also be fixed to the base of the fuel cell stack in other ways.

[0044] S4, bend and tighten the connector along the surface of the fuel cell stack, and fix another mounting rod to the base; One mounting rod is fixed to the fuel cell stack. By lifting the other mounting rod, the connector is bent and tightened along the surface of the fuel cell stack. The other mounting rod is pre-tightened first in the middle and then at both ends. The torque is then repeatedly checked to ensure that all fasteners are tightened in the same way. During the fixing of the other mounting rod, the size compensation function of the strap can be realized, which can improve the convenience of fuel cell stack packaging and make it easier to ensure the consistency of the assembly process.

[0045] S5, check the fixing torque of the two mounting rods; Among them, verifying the fixing torque of the two mounting rods can ensure that the fasteners at each mounting part are tightened in the same way, and can ensure the packaging consistency of the packaged components on the fuel cell stack.

[0046] S6, raise the pressure head used to compress the fuel cell stack.

[0047] Once the two mounting rods are fixed and the fixing torque is verified, the encapsulation assembly is assembled with the fuel cell stack. The pressure head used to compress the fuel cell stack is then raised, and the fuel cell stack is encapsulated.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A packaging assembly for a fuel cell stack, characterized in that, The encapsulation component includes: Two mounting rods are provided for fixing to the base of the fuel cell stack. Both mounting rods extend along a first direction and are parallel to each other. A connector adapted to connect between two mounting rods, wherein, when the fuel cell stack is compressed, the two mounting rods are located on opposite sides of the fuel cell stack along a second direction and are adapted to be fixed to the base, the connector is bent along the surface of the fuel cell stack and abuts against the fuel cell stack to encapsulate the fuel cell stack, the connector is configured to be elongated before encapsulating the fuel cell stack, and the first direction and the second direction are perpendicular.

2. The packaging assembly for a fuel cell stack according to claim 1, characterized in that, The connector includes multiple straps, which are arranged sequentially along the first direction, and each strap connects two mounting rods.

3. The packaging assembly for a fuel cell stack according to claim 2, characterized in that, The multiple straps are of the same length.

4. The packaging assembly for a fuel cell stack according to claim 2, characterized in that, The spacing between any two adjacent straps along the first direction is the same.

5. The packaging assembly for a fuel cell stack according to claim 2, characterized in that, Each of the straps has through holes at both ends for the corresponding mounting rod to pass through along the first direction.

6. The packaging assembly for a fuel cell stack according to claim 5, characterized in that, The through hole is formed by winding the end of the strap.

7. The packaging assembly for a fuel cell stack according to claim 1, characterized in that, The mounting rod has multiple mounting portions arranged sequentially along the extension direction of the mounting rod, and the mounting rod is fixedly connected to the fuel cell stack through the mounting portions.

8. The packaging assembly for a fuel cell stack according to claim 7, characterized in that, The mounting portion has mounting holes for fasteners to pass through.

9. The packaging assembly for a fuel cell stack according to claim 1, characterized in that, The two mounting rods have the same structure.

10. A packaging method for an electric fuel cell stack, characterized in that, The encapsulation method, applied to the encapsulation component according to any one of claims 1-9, comprises: The connector is connected between the two mounting rods; A tensile load is applied to the connector to elongate it; One of the mounting rods is fixed to the base of the fuel cell stack; The connector is bent and tightened along the surface of the fuel cell stack, and another mounting rod is fixed to the base; Verify the fixing torque of the two mounting rods; Raise the pressure head used to compress the fuel cell stack.

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