Positioning mechanism for electric pile, fuel cell assembly with positioning mechanism and assembling method

Abstract

The invention relates to the field of fuel cells, in particular to a positioning mechanism for a galvanic pile, a fuel cell assembly with the positioning mechanism and an assembling method.The positioning mechanism comprises a plurality of positioning pull rods, each positioning pull rod comprises a positioning base plate, and a positioning protruding column is arranged on the side face of each positioning base plate; the positioning mechanism disclosed by the invention can be mounted on the front end plate of the fuel cell in advance, so that a good lateral limiting effect is achieved, subsequent position limitation on reactor core mounting is facilitated, and the stability of the lateral position of the reactor core is ensured.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, in particular to a positioning mechanism for a fuel cell stack, a fuel cell assembly having the positioning mechanism and an assembly method thereof. Background Art

[0002] A fuel cell is a chemical device that directly converts the chemical energy of a fuel into electrical energy. It is composed of a number of stacked bipolar plates and membrane electrodes.

[0003] The membrane electrode is the core reaction area of ​​the fuel cell. The accurate positioning of the bipolar plate and the membrane electrode enables the reaction gas to effectively reach the catalyst layer, ensuring the efficiency of the electrochemical reaction.

[0004] In addition, inaccurate positioning between the bipolar plate and the membrane electrode may result in poor contact, poor sealing or short circuit between them; therefore, accurate positioning is an important prerequisite for ensuring stable operation of the fuel cell.

[0005] The existing technology usually controls the positioning accuracy by combining an internal positioning rod and an external positioning tool for loading the pile.

[0006] This method has the following disadvantages: 1. The internal positioning rod and the external positioning tool need to be repeatedly installed and disassembled before and after stacking and during subsequent maintenance, which is cumbersome to operate; 2. Due to dimensional errors of parts and other reasons, the internal positioning rod and some external positioning tools are prone to friction or collision with the bipolar plates and membrane electrodes during disassembly, causing damage to the battery stack and posing a safety hazard.

[0007] In addition, a fuel cell stack usually includes multiple single cells connected in series, and the multiple single cells need to be compressed by end plates at both ends. In addition, when the core is subjected to temperature shock, the core will expand and contract due to thermal expansion and contraction. Due to the continuous expansion and contraction, if the core is in a fixed and enclosed space, the external compression of the packaging body will seriously affect the normal use of the core.

[0008] The existing patent 202321761976.1-Stack structure and fuel cell does not clearly disclose the technical content for solving the above technical problems.

[0009] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing battery stack structure. Summary of the invention

[0010] The object of the present invention is to provide a positioning mechanism for a fuel cell stack which can ensure the accurate installation position of the core.

[0011] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0012] A positioning mechanism for a battery stack comprises a plurality of positioning rods, each of the positioning rods comprises a positioning substrate, and a positioning protrusion column is arranged on the side of the positioning substrate.

[0013] The positioning substrate comprises a supporting substrate and an insulating substrate, wherein the insulating substrate and the positioning protrusions are distributed on two opposite side surfaces of the supporting substrate.

[0014] The positioning substrate comprises a middle support body; a front support body is provided at one end of the middle support body; a rear support body is provided at the other end; the horizontal projection areas of the front support body and the rear support body are both larger than the horizontal projection area of ​​the middle support body; the vertical cross section of the positioning substrate is I-shaped.

[0015] The positioning substrate is provided with a positioning component and a fastening component. The positioning component includes a positioning pin arranged at the end of the positioning substrate; and the fastening component includes a fixing hole arranged at the end of the positioning substrate.

[0016] A fuel cell assembly comprises a packaging shell, a stack core, an end plate mechanism and a positioning mechanism for the stack;

[0017] The packaging shell is a box structure with a hollow interior;

[0018] The core is placed inside the packaging shell;

[0019] The positioning mechanisms in the positioning mechanism for the battery stack are distributed around the core and connected to the inner wall of the pressing package shell;

[0020] The end plate mechanism comprises a front end plate and a rear end plate mechanism;

[0021] The front end plate and the rear end plate mechanism are distributed at both ends of the packaging shell;

[0022] The stack positioning mechanism, the front end plate and the rear end plate mechanism are pressed against the core.

[0023] The rear end plate mechanism comprises a rear end plate and a floating end plate; the rear end plate is connected to the floating end plate through an elastic mechanism; and the floating end plate fits the core end surface.

[0024] The elastic mechanism includes a plurality of elastic components; the elastic components include support springs; and the elastic components further include spring pads arranged at the ends of the support springs.

[0025] The floating end plate is provided with a fixing hole for placing the elastic component; the elastic component also includes a tightening bolt; the tightening bolt passes through the rear end plate and presses against the spring pad in the corresponding fixing hole.

[0026] A guiding groove is arranged on the inner wall of the packaging shell.

[0027] A method for assembling the fuel cell assembly, the method comprising the following steps:

[0028] Step 1: First, install the positioning rods in the positioning mechanism of the battery stack on the front end plate respectively; each positioning rod surrounds a placement cavity;

[0029] Step 2: Then place the core in the above-mentioned placement cavity;

[0030] Step 3: After step 2 is completed, the rear end plate mechanism is arranged on the core placed on the inner cavity and fixed to form a stack structure;

[0031] Step 4: After step 3 is completed, plug the battery stack structure into the packaging shell;

[0032] Step 5: After completing step 4, one fuel cell assembly is assembled. If you need to assemble other fuel cell assemblies, repeat steps 1-4 above.

[0033] The advantages of the present invention are:

[0034] The invention discloses a positioning mechanism for a fuel cell stack, a fuel cell assembly having the positioning mechanism and an assembly method.

[0035] The positioning mechanism disclosed in the present invention can be pre-installed on the front end plate of the fuel cell, playing a good lateral limiting role, facilitating the subsequent position limitation of the core installation, and ensuring the stability of the lateral position of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0037] Figure 1 It is a schematic diagram of the structure of the fuel cell in the present invention.

[0038] Figure 2 It is a schematic structural diagram of the positioning pull rod in the present invention.

[0039] Figure 3 It is a structural schematic diagram of the connection between the positioning mechanism for the fuel cell stack and the front end plate in the present invention.

[0040] Figure 4 It is a schematic diagram of the structure of the battery stack in the present invention.

[0041] Figure 5 It is a schematic diagram of the structure of the battery stack and the packaging shell when assembled in the present invention.

[0042] The marks in the above figure are:

[0043] 1-, front end plate; 11- positioning hole; 2- packaging shell; 21- guide groove; 3- positioning rod; 31- supporting base plate; 32- insulating base plate; 33- bolt; 34- positioning pin; 35- chamfer; 4- bolt; 5- core; 6- floating end plate; 7- supporting spring; 8- rear end plate; 81- circular process hole; 9- tightening screw. DETAILED DESCRIPTION

[0044] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0045] A positioning mechanism for a fuel cell stack includes a plurality of positioning rods 3, each of the positioning rods 3 includes a positioning substrate, and a positioning protrusion is provided on the side of the positioning substrate; the positioning mechanism disclosed in the present invention can be pre-installed on the front end plate 1 of the fuel cell, and plays a good lateral limiting role, which is convenient for the subsequent position limitation of the core 5 installation and ensures the stability of the lateral position of the core 5.

[0046] The positioning mechanism for a fuel cell stack disclosed in the present invention is mainly used to limit the lateral position of a core 5 of a fuel cell, and subsequently cooperates with a packaging shell 2 to achieve the limitation of the lateral position of the core 5 .

[0047] In the present invention, the positioning mechanism for the fuel cell stack mainly includes a plurality of positioning rods 3. The positioning rods 3 have one function of laterally limiting the core 5, and another function of cooperating with the packaging shell 2 to limit the installation position of the fuel cell stack structure, specifically, to limit the position of the fuel cell stack structure in the packaging shell 2.

[0048] In addition, in the present invention, each positioning rod 3 includes a positioning substrate, the inner side surface of the positioning substrate is a plane, which is used for subsequent lateral support positioning, and in the present invention, a positioning protrusion column is provided on the side of the positioning substrate; when used later, the positioning protrusion column can cooperate with the guide groove 21 on the inner wall of the packaging shell 2 for installation guidance of the battery stack structure.

[0049] Furthermore, the positioning substrate in the present invention includes a supporting substrate 31 and an insulating substrate 32. The positioning substrate in the present invention is a supporting and limiting plate. The supporting substrate 31 of the present invention is the middle supporting structure of the positioning substrate, and the insulating substrate 32 not only realizes the supporting and limiting function, but also plays an isolation and protection role.

[0050] Meanwhile, in the present invention, the insulating substrate 32 and the positioning protrusions are distributed on two opposite sides of the supporting substrate 31 ; such a configuration avoids mutual installation interference between the positioning protrusions and the insulating substrate 32 .

[0051] Furthermore, the positioning substrate in the present invention includes a middle support body; a front support body is provided at one end of the middle support body; and a rear support body is provided at the other end; the setting of the middle support body plays a good supporting and raising role, and in the setting of the front support body and the rear support body, the front support body is connected to the front end plate 1, and the rear support body is used to connect to the rear end plate 8. Based on such a setting, the assembly of the battery stack structure is facilitated.

[0052] At the same time, the horizontal projection areas of the front support body and the rear support body of the present invention are larger than the horizontal projection area of ​​the middle support body; the vertical cross-section of the positioning substrate is I-shaped; such a setting allows the front support body and the rear support body to form a horizontal protrusion on the middle support body, which facilitates the subsequent setting of fastening components. At the same time, the front support body is used to ensure the fitting area of ​​the front end plate 1, and the rear support body is used to ensure the fitting area with the rear end plate 8. Based on such a setting, the contact area between the positioning mechanism and the front end plate 1 and the rear end plate 8 is guaranteed; and the stability of the connection between the three is guaranteed.

[0053] In addition, in the present invention, a positioning component and a fastening component are provided on the positioning substrate, and the positioning component includes a positioning pin 34 arranged at the end of the positioning substrate; the fastening component includes a fixing hole arranged at the end of the positioning substrate; in the present invention, the positioning pin 34 is arranged on the side of the positioning substrate close to the front end plate 1, and is specifically installed on the end face of the front support body; and the fastening component is also arranged on the front support body, and the fixing hole is arranged through the front support body, and can be subsequently connected to the front end plate 1 by passing a bolt through the front support body.

[0054] A fuel cell assembly comprises a packaging shell 2, a core 5, an end plate mechanism and a positioning mechanism for the stack; the packaging shell 2 is a box structure with a hollow interior; the core 5 is placed inside the packaging shell 2; the positioning mechanisms in the positioning mechanism for the stack are distributed around the core 5 and connected to the inner wall of the packaging shell 2; the end plate mechanism comprises a front end plate 1 and a rear end plate mechanism; the front end plate 1 and the rear end plate mechanism are distributed at both ends of the packaging shell 2; the positioning mechanism for the stack, the front end plate 1 and the rear end plate mechanism are pressed against the core 5; the present invention can realize the extrusion fixation of the core 5 in 6 directions by using the positioning mechanism for the stack, the front end plate 1 and the rear end plate mechanism in combination, thereby ensuring the overall strength of the packaging structure and fixing the core 5, thereby improving the overall vibration and impact resistance of the stack.

[0055] In the present invention, the packaging shell 2 is a box structure with a hollow interior; the core 5 is placed inside the packaging shell 2; the positioning rods 3 in the positioning mechanism for the battery stack are evenly distributed on the inner wall of the packaging shell 2; the end plate mechanism includes a front end plate 1 and a rear end plate mechanism; the front end plate 1 and the rear end plate mechanism are distributed at both ends of the packaging shell 2; the positioning mechanism for the battery stack, the front end plate 1 and the rear end plate mechanism are pressed against the core 5; the present invention can realize the extrusion and fixation of the core 5 in 6 directions through the coordinated use of the positioning mechanism for the battery stack, the front end plate 1 and the rear end plate mechanism, while ensuring the overall strength of the packaging structure, the fixation of the core 5 is realized, and the overall vibration and impact resistance of the battery stack is improved.

[0056] The packaging shell 2 of the present invention mainly plays an external protective role, which facilitates the arrangement and placement of the core 5. The core 5 is arranged inside the packaging shell 2, and a positioning mechanism and an end plate mechanism for the fuel cell stack are provided on the packaging shell 2; the positioning mechanism for the fuel cell stack mainly provides internal support for the core 5 placed in the packaging shell 2, and the end plate mechanism mainly provides end support for the core 5, thereby achieving extrusion and fixation of the core 5 in 6 directions. While ensuring the overall strength of the packaging structure, the core 5 is fixed, thereby improving the overall vibration and impact resistance of the fuel cell stack.

[0057] As shown in the figure, the end plate mechanism of the present invention includes a front end plate 1 and a rear end plate mechanism; the front end plate 1 and the rear end plate mechanism are distributed at both ends of the packaging shell 2; the front end plate 1 is used for supporting the lower part of the core 5, and the rear end plate mechanism is used for supporting the upper part of the core 5. In the present invention, the core 5 supporting mechanism is arranged on the inner wall of the packaging shell 2, and the core 5 is squeezed and fixed by pressing the core 5 with the core 5 supporting mechanism, the front end plate 1 and the rear end plate mechanism.

[0058] Furthermore, in the present invention, the rear end plate mechanism includes a rear end plate 8 and a floating end plate 6; the rear end plate 8 is connected to the floating end plate 6 through an elastic mechanism; the floating end plate 6 fits the end face of the core 5; in the present invention, the rear end plate 8 is fixed at the end of the packaging shell 2, and the floating end plate 6 is equivalent to being arranged inside the packaging shell 2, and the floating end plate 6 is pressed against the end of the core 5, thereby achieving blocking and squeezing of the core 5; and the setting of the elastic mechanism enables the floating end plate 6 to have a certain mobility. Such a setting enables the floating end plate 6 to be in contact with the core 5 all the time when the battery cell expands and contracts with heat and cold, and then while achieving the position limitation of the core 5, the compression deformation of the spring 7 can also be used to compensate for the thermal expansion and contraction of the core 5, thereby ensuring that the core 5 still has good sealing performance under low temperature conditions.

[0059] Furthermore, in the present invention, the elastic mechanism includes a plurality of elastic components; the plurality of elastic components are arranged at intervals between the rear end plate 8 and the floating end plate 6; in the present invention, the elastic component includes a support spring 7; the support spring 7 provides elastic force to ensure that the floating end plate 6 and the core 5 are in a constant contact state.

[0060] Furthermore, the elastic component in the present invention also includes a spring pad arranged at the end of the support spring 7; the spring pad plays a good blocking and supporting role, which is convenient for the subsequent cooperation with the tightening bolt 9 to achieve the extrusion and fixation of the floating end plate 6; and prevents the support spring 7 from being separated from the tightening bolt 9.

[0061] Furthermore, the floating end plate 6 described in the present invention is provided with a fixing hole for placing the elastic component; the provision of the fixing hole in the present invention facilitates the placement of the elastic component, and at the same time, the position of the floating end plate 6 can be limited by subsequently inserting the tightening bolts 9 into the corresponding fixing holes, thereby avoiding lateral displacement of the floating end plate 6.

[0062] In addition, the elastic component in the present invention also includes a tightening bolt 9; the tightening bolt 9 passes through the rear end plate 8 and presses against the spring pad in the corresponding fixing hole; the tightening bolt 9 is threadedly connected to the rear end plate 8, and the end portion is inserted into the fixing hole to squeeze the elastic component in the fixing hole, thereby realizing the squeezing of the floating end plate 6 on the end surface of the core 5.

[0063] specific:

[0064] The battery stack structure disclosed in the present invention is designed with a reinforcement structure on the package to ensure the overall structural strength of the package and ensure that the package deformation is within an allowable range under the action of assembly force.

[0065] In addition, a positioning mechanism for the stack is provided between the encapsulating shell 2 and the core 5, and the core 5 is fixed in four directions: front, rear, left and right.

[0066] In the axial direction, the core 5 is fixed by the front end plate 1 and the rear end plate mechanism, so that the core 5 is fixed in six directions. While ensuring the overall strength of the packaging structure, the core 5 is fixed, thereby improving the overall vibration and impact resistance of the fuel cell stack.

[0067] A support spring 7 is designed on the floating end plate 6. The assembly force acts on the support spring 7 through the spring pad. The compression deformation of the spring 7 is used to compensate for the thermal expansion and contraction of the core 5, ensuring that the core 5 still has good sealing performance under low temperature conditions.

[0068] The front end plate 1 is fixed on the packaging shell 2 , the core 5 is placed inside the packaging shell 2 , and the core 5 is abutted against the inner cavity of the positioning mechanism for the stack on all sides; then an end plate 6 is prevented from floating on the core 5 .

[0069] Then, the support spring 7 and the spring washer are sequentially placed into the fixing holes on the floating end plate 6, and the rear end plate 8 is fixed on the packaging shell 2. After the pressure on the press acts on the floating end plate 6 to a certain assembly force, the long tightening bolt 9 is screwed into the threaded through hole of the rear end plate 8 to act on the spring washer, and then the tightening bolt 9 is shortened with a certain torque, so that the force acting on the core 5 reaches a certain degree, and the core 5 is fixed in six directions: front, rear, left, right, up and down. The support spring 7 allows the core 5 to maintain a certain deformation space in the vertical direction, and can also compensate for the assembly force of the core 5 when it shrinks, so that the core 5 can play a sealing role.

[0070] Furthermore, in the present invention, a guide groove 21 is provided on the inner wall of the package shell 2; the setting of the guide groove 21 in the present invention plays a good guiding and limiting role, which is convenient for subsequent use.

[0071] In the present invention, a positioning protrusion is provided on the side of the positioning substrate; the positioning protrusion can cooperate with the guide groove 21 on the inner wall of the packaging shell 2 in subsequent use to guide the installation of the battery stack structure.

[0072] A method for assembling the fuel cell assembly, the method comprising the following steps:

[0073] Step 1: First, install the positioning rods 3 in the positioning mechanism for the battery stack on the front end plate 1 respectively; each positioning rod 3 surrounds a placement cavity;

[0074] Step 2: Then place the core 5 in the above-mentioned placement cavity;

[0075] Step 3: After step 2 is completed, a rear end plate mechanism is arranged on the core 5 placed on the inner cavity and fixed to form a stack structure;

[0076] Step 4: After step 3 is completed, the battery stack structure is plugged into the packaging shell 2;

[0077] Step 5: After completing step 4, one fuel cell assembly is assembled. If you need to assemble other fuel cell assemblies, repeat steps 1-4 above.

[0078] The present invention can facilitate the assembly of the fuel cell assembly through the disclosure of the above-mentioned assembly method; it can not only ensure the assembly efficiency, but also well ensure the assembly quality.

[0079] specific;

[0080] The invention discloses a fuel cell assembly and related components thereof.

[0081] The present invention uses a positioning rod 3 to achieve installation limitation of the core 5 .

[0082] In addition, the positioning rod 3 also meets the functional requirements of the stack structure (connecting the front end plate 1 and the rear end plate 8 to make the stack structure an integral whole), and can also be used to support the stack core 5 part.

[0083] When assembling the packaging shell 2, the positioning protrusion column feature on the outside of the positioning pull rod 3 also plays a guiding and positioning role; the positioning protrusion column is a semicircular protrusion.

[0084] The positioning rod 3 includes a supporting substrate 31 and an insulating substrate 32 , the side close to the core 5 is made of insulating plastic material, and the other side is made of metal material.

[0085] The two parts can be fixed by bolts 33, or connected by glue bonding, clamping, or bolt connection + glue.

[0086] When assembling the battery stack, a plurality of positioning rods 3 are fixed on the front end plate 1 .

[0087] The area surrounded by the positioning rods 3 is the assembly area of ​​the core 5 , and the size of the area is determined according to the outer dimensions of the core 5 plus the required installation accuracy.

[0088] In the present invention, the core 5 includes bipolar plates, membrane electrodes, insulating plates, front current collecting plates, rear current collecting plates, rear insulating plates and other parts.

[0089] In addition, in the present invention, a circular process hole 81 is provided on the rear end plate 8; in subsequent use, the stacking equipment is used to press the bipolar plate and the membrane electrode area through the circular process hole 81 on the rear end plate 8, so as to facilitate subsequent assembly operations.

[0090] In the present invention, the positioning protrusion on the outside of the positioning pull rod 3 is aligned with the semicircular guide groove 21 on the packaging shell 2, the battery stack structure is dropped into the packaging shell 2, and the front end plate 1 is locked with the packaging shell 2 using bolts to complete the assembly of the packaging shell 2.

[0091] The specific plan includes the following steps:

[0092] 1. First, align the positioning pin 34 on the corresponding positioning rod 3 with the corresponding positioning hole 11 on the front end plate 1, assemble the positioning rod 3 on the front end plate 1, and lock it with the front end plate 1 by passing the fastening bolt 4 through the fixing hole on the positioning rod 3.

[0093] After all the positioning rods 3 around the front end plate 1 are assembled, the middle area restricted by the positioning rods 3 is the assembly area of ​​the core 5, which can realize the precise positioning function of the assembly parts;

[0094] 2. Assemble the core 5 and the floating end plate 6 in sequence in the placement cavity restricted by the positioning rod 3, and then make the stacking equipment pass through the stacking equipment process hole to apply a specified pressure to the core 5 and the floating end plate 6, and then assemble the support spring 7 and the spring pad at the specified position on the floating end plate 6, and then lock the rear end plate 8 to the positioning rod 3 by bolts.

[0095] Finally, the tightening bolt 9 passes through the threaded hole on the rear end plate 8 to hold the spring 7 and the gasket, and a certain torque is applied to the tightening bolt 9 to achieve assembly.

[0096] 3. Set a chamfer 35 feature at the end of the positioning protrusion column, align the chamfer 35 feature with the guide groove 21 feature, drop the battery stack structure assembled in the second step into the packaging shell 2, and then lock the front end plate 1 and the packaging shell 2 with bolts to complete the assembly of the fuel cell assembly.

[0097] If the battery stack needs to be disassembled or repaired, just follow the assembly steps without assembling additional stacking tools.

[0098] The fuel cell assembly and assembly method disclosed in the present invention improve positioning accuracy and avoid repeated installation and disassembly of positioning tools.

[0099] The technical solution of the present invention has the following beneficial effects:

[0100] The present invention realizes that no additional stacking tooling is required during the assembly and maintenance of the battery stack, thereby reducing the requirements for stacking equipment;

[0101] The present invention does not require the process of disassembling the stacking tooling after the stacking is completed, which effectively avoids damage to the battery stack during the tooling disassembly process;

[0102] The present invention has strong adaptability and can adapt to battery stacks of different lengths and sizes by adjusting the length of the positioning rods 3 and the distance between the positioning rods 3;

[0103] The present invention prevents the battery stack from colliding with the packaging shell 2 by positioning the positioning protrusion on the positioning rod 3 and the guide groove 21 of the packaging shell 2, thereby effectively protecting the battery stack.

[0104] When the battery stack is disassembled or repaired, the present invention can directly perform the disassembly or repair on the stacking equipment without assembling additional stacking tooling.

[0105] The invention has a simple structure and is easy to operate, and can effectively improve production efficiency.

[0106] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A positioning mechanism for a battery stack, characterized in that: It comprises a plurality of positioning rods, each of which comprises a positioning base plate, and a positioning protrusion column is arranged on the side of the positioning base plate.

2. A positioning mechanism for a battery stack according to claim 1, characterized in that: The positioning substrate comprises a supporting substrate and an insulating substrate, wherein the insulating substrate and the positioning protrusions are distributed on two opposite side surfaces of the supporting substrate.

3. A positioning mechanism for a battery stack according to claim 1, characterized in that: The positioning substrate comprises a middle support body; a front support body is provided at one end of the middle support body; a rear support body is provided at the other end; the horizontal projection areas of the front support body and the rear support body are both larger than the horizontal projection area of ​​the middle support body; the vertical cross section of the positioning substrate is I-shaped.

4. A positioning mechanism for a battery stack according to claim 2, characterized in that: The positioning substrate is provided with a positioning component and a fastening component. The positioning component includes a positioning pin arranged at the end of the positioning substrate; and the fastening component includes a fixing hole arranged at the end of the positioning substrate.

5. A fuel cell assembly, characterized in that: It comprises a packaging shell, a core, an end plate mechanism and a positioning mechanism for a fuel cell stack as claimed in any one of claims 1 to 4; The packaging shell is a box structure with a hollow interior; The core is placed inside the packaging shell; The positioning mechanisms in the positioning mechanism for the battery stack are distributed around the core and connected to the inner wall of the pressing package shell; The end plate mechanism comprises a front end plate and a rear end plate mechanism; The front end plate and the rear end plate mechanism are distributed at both ends of the packaging shell; The stack positioning mechanism, the front end plate and the rear end plate mechanism are pressed against the core.

6. A fuel cell assembly according to claim 5, characterized in that: The rear end plate mechanism comprises a rear end plate and a floating end plate; the rear end plate is connected to the floating end plate through an elastic mechanism; and the floating end plate fits the core end surface.

7. A fuel cell assembly according to claim 6, characterized in that: The elastic mechanism includes a plurality of elastic components; the elastic components include support springs; and the elastic components further include spring pads arranged at the ends of the support springs.

8. A fuel cell assembly according to claim 6, characterized in that: The floating end plate is provided with a fixing hole for placing the elastic component; the elastic component also includes a tightening bolt; the tightening bolt passes through the rear end plate and presses against the spring pad in the corresponding fixing hole.

9. A fuel cell assembly according to claim 5, characterized in that: A guiding groove is arranged on the inner wall of the packaging shell.

10. A method for assembling a fuel cell assembly as claimed in any one of claims 5 to 9, characterized in that: The assembly method comprises the following steps: Step 1: First, install the positioning rods in the positioning mechanism of the battery stack on the front end plate respectively; each positioning rod surrounds a placement cavity; Step 2: Then place the core in the above-mentioned placement cavity; Step 3: After step 2 is completed, the rear end plate mechanism is arranged on the core placed on the inner cavity and fixed to form a stack structure; Step 4: After step 3 is completed, plug the battery stack structure into the packaging shell; Step 5: After completing step 4, one fuel cell assembly is assembled. If you need to assemble other fuel cell assemblies, repeat steps 1-4 above.

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