Electric pile assembly method, electric pile assembly structure and fuel cell module

Abstract

The invention discloses a galvanic pile assembly method, a galvanic pile assembly structure and a fuel cell module, and solves the problem that conventional press-fitting equipment in the prior art cannot realize super-power galvanic pile assembly. The stack assembly method comprises the following steps: sequentially stacking parts of a stack in a positioning space, stopping stacking when the height of a stacked body reaches a first set height, pre-pressing the stacked body in the positioning space, keeping the stacked body in a compressed state for a set time, and cancelling the pressure on the stacked body; the above steps are repeated, and the remaining parts of the galvanic pile continue to be stacked in the positioning space until all the parts of the galvanic pile are stacked in the positioning space; and pressing a stack formed by all the parts in the positioning space to a target height H through a pressing device, fastening the stack through a fastening assembly to transfer the pressing force of the pressing device, and withdrawing the pressing device to complete the assembly of the galvanic pile. According to the stack assembly method, the super-power stack can be assembled by conventional press-fitting equipment.

Description

Technical Field

[0001] The present application belongs to the technical field of battery stack assembly, and specifically relates to a battery stack assembly method, a battery stack assembly structure, and a fuel cell module. Background Art

[0002] With the rapid development of the fuel cell industry, the application scenarios of fuel cell systems are constantly expanding, and a wider range of output power ranges of battery systems are also being put forward. At present, fuel systems are gradually being promoted to large commercial vehicles, which puts higher requirements on the output power of fuel-electric systems.

[0003] High-power fuel-electric systems usually generate electricity by assembling a single or multiple stacks. Systems that use a single stack have the advantage of higher power density due to fewer parts and higher space utilization, but the size of the single stack will also increase simultaneously, which puts higher demands on the design capabilities of the stack. Due to the installation space limitations of the vehicle, it is obvious that a single-stack fuel-electric system with a higher power density is more suitable for use in large commercial vehicles. Ultra-high-power stacks are made up of hundreds of single cells stacked together, and the height of the stack is close to 1m, which puts greater travel requirements on the assembly equipment of the stack.

[0004] In the related art, the assembly process of the battery stack is usually divided into three steps: first, all single cells are stacked to form a stack body, then the pressing head of the pressing equipment compresses the stack body to a certain height, and finally the compressed stack body is locked by the fastening structure to complete the pressing of the battery stack.

[0005] The height of the stack is about 20% higher than the height after pressing, and the compression stroke of the pressing equipment is usually around 1m, which makes it impossible to assemble ultra-high-power battery stacks using conventional pressing equipment. Summary of the invention

[0006] In order to solve the technical problem that conventional press-assembly equipment cannot be used to assemble ultra-high power fuel cell stacks, the present application provides a fuel cell stack assembly method, a fuel cell stack assembly structure and a fuel cell module.

[0007] In a first aspect of the present application, a method for assembling a battery stack is provided, comprising:

[0008] The parts of the battery stack are stacked in sequence in the positioning space to form a stack body. When the height of the stack body reaches a first set height H1, the stack body is stopped from being stacked. The stack body in the positioning space is pre-pressed by a press-fitting device to keep the stack body in a compressed state for a set time, and the pressure on the stack body is removed. The first set height H1 is not greater than the height Hmax of the pressure head when the press-fitting device is at the maximum stroke.

[0009] Repeat the above steps to continue stacking the remaining parts of the battery stack in the positioning space until all the parts of the battery stack are stacked in the positioning space;

[0010] The stack formed by all the parts in the positioning space is pressed to a target height H by a pressing device, the stack is fastened by a fastening assembly to transfer the pressing force of the pressing device, and the pressing device is evacuated to complete the assembly of the battery stack.

[0011] In some embodiments, maintaining the stack in a compressed state specifically includes: maintaining the stack compressed to a second set height H2.

[0012] In some embodiments, the second set height H2 is set to H2=H; the first set height H1 is set to H

[0013] In some embodiments, maintaining the stack in a compressed state specifically includes: compressing the stack at a set holding pressure.

[0014] In some embodiments, the set holding force is 0.4F to 0.6F, wherein F represents the designed fastening force of the battery stack.

[0015] In some embodiments, the pre-pressing pressure is 0.4F to 0.6F, wherein F represents the designed tightening force of the battery stack.

[0016] In some embodiments, the set time is 2 to 4 hours.

[0017] In a second aspect of the present application, a battery stack assembly structure is provided, which is applicable to the battery stack assembly method of the first aspect, and the battery stack assembly structure comprises:

[0018] A positioning mechanism, comprising a plurality of positioning rods arranged at intervals, wherein the plurality of positioning rods surround the outer side of the battery stack to provide a positioning space;

[0019] The fastening assembly is used to keep the stack in a compressed state for a set time and to fasten the stack to transfer the pressing force of the pressing device; the fastening assembly is provided with positioning grooves for installing a plurality of the positioning rods.

[0020] ​In some embodiments, the fastening assembly includes a shell, an insulating support rod and a plurality of cross beams, the shell having a first opening, the insulating support rod being provided with a plurality of insulating support rods, the plurality of insulating support rods being spaced apart and located on the inner wall of the shell, the insulating support rod being provided with the positioning groove, the cross beam being detachably connected to the first opening of the shell, the plurality of cross beams being spaced apart and pressed against the stacking body, the lower portion of the positioning rod being located in the shell, at least two of the positioning rods being located in the positioning grooves of the insulating support rods, and the positioning rods and the cross beams being staggered.

[0021] In some embodiments, the shell includes a frame and a cover plate, the frame is provided with the first opening and the second opening, the cover plate is connected to the frame and covers the second opening; the sides of the frame are provided with operating ports, the two ends of the beam are respectively pressed against the port wall of the operating port and the frame, and the insulating support rod is attached to the inner wall of the frame.

[0022] In some embodiments, the positioning mechanism further includes a fixing bracket connected to the frame and a portion of the positioning rod located outside the housing, so that an end surface of the positioning rod facing the battery stack protrudes outside the positioning slot;

[0023] The assembly structure further comprises a profiling tool, the outer envelope surface or the inner envelope surface of the profiling tool being the same as the outer contour of the core of the fuel cell stack.

[0024] In some embodiments, the locking assembly includes a first pressure plate, a second pressure plate and a plurality of spaced-apart connecting rods, the connecting rods are connected to the first pressure plate and the second pressure plate, the sides of the first pressure plate and the second pressure plate are provided with the positioning grooves; the two end plates located at both ends of the battery stack constitute the first pressure plate and the second pressure plate respectively.

[0025] In some embodiments, the positioning rod is connected to a workbench of a press-fitting device, and the workbench and a plurality of the positioning rods together enclose the positioning space.

[0026] In a third aspect of the present application, a fuel cell module is provided, which is assembled using the stack assembly structure of the second aspect, and the fuel cell module comprises:

[0027] A shell and a packaging plate, wherein the shell is provided with a first opening, and the packaging plate is connected to the shell and covers the first opening;

[0028] A plurality of cross beams are spaced apart and are detachably connected to the housing and are close to the first opening;

[0029] A battery stack, located in the shell and pressed against the crossbeam;

[0030] A plurality of insulating support rods are distributed at intervals and located between the shell and the battery stack. The insulating support rods are provided with positioning grooves for installing the positioning rods. The shell, the plurality of insulating support rods and the plurality of cross beams jointly apply a fastening force along the stacking direction to the battery stack.

[0031] The battery stack assembly method provided in an embodiment of the present application includes: stacking the parts of the battery stack in sequence in a positioning space to form a stack body, stopping stacking when the height of the stack body reaches a first set height H1, pre-pressing the stack body in the positioning space by a pressing device, keeping the stack body in a compressed state for a set time, and removing the pressure on the stack body; the first set height H1 is not greater than the height Hmax of the pressure head when the pressing device is at the maximum stroke; repeating the above steps, continuing to stack the remaining parts of the battery stack in the positioning space until all the parts of the battery stack are stacked in the positioning space; pressing the stack body formed by all the parts in the positioning space to a target height H by a pressing device, fastening the stack body by a fastening assembly to transfer the pressing force of the pressing device, evacuating the pressing device, and completing the assembly of the battery stack.

[0032] During the assembly process, the present application controls the height of the stack before each pre-pressing to be no higher than the height Hmax of the pressure head when the pressing device is at the maximum stroke, so that the existing pressing device can pre-press the stack, and then keep the stack in a compressed state for a set time after pre-pressing, so that the stack rebounds, but the height after rebound is less than the set height H1. At this time, other parts of the battery stack can continue to be added until they do not exceed the height Hmax of the pressure head when the pressing device is at the maximum stroke, and pre-press multiple times and keep the compressed state for a set time, thereby realizing the assembly of ultra-high power battery stacks using existing short-stroke pressing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A process step diagram of a stack assembly method is shown.

[0034] Figure 2 A schematic diagram of the structure of a single battery in one or more embodiments of the present application is shown.

[0035] Figure 3 A schematic structural diagram of a positioning mechanism in one or more embodiments of the present application is shown.

[0036] Figure 4 A structural schematic diagram of the positioning rod fine-tuning process of the present application is shown.

[0037] Figure 5 The stack is shown using Figure 4 Schematic diagram of the structure of the positioning mechanism before pre-pressing.

[0038] Figure 6 A schematic diagram showing the coordination of the positioning rod, the insulating support rod and the shell during the assembly of the battery stack in one or more embodiments of the present application is shown.

[0039] Figure 7 The stack is shown using Figure 4 Schematic diagram of the structure of the positioning mechanism in a compressed state.

[0040] Figure 8 A schematic structural diagram of a positioning mechanism in one or more embodiments of the present application is shown.

[0041] Fig. 9 The stack is shown using Figure 8 Schematic diagram of the structure of the positioning mechanism before pre-pressing.

[0042] Fig.10 The stack is shown using Figure 8 Structural schematic diagram of the positioning mechanism in a compressed state.

[0043] Fig.11 The stack is shown using Figure 8 Structural schematic diagram of the positioning mechanism in a tightened state.

[0044] Fig.12 A schematic structural diagram of a fuel cell module is shown.

[0045] Fig.13 Shows Fig.12 A cross-sectional view of a fuel cell module.

[0046] Fig.14 Shows Fig.13 Schematic diagram of the structure of the side support rod.

[0047] Fig.15 Shows Fig.13 Schematic diagram of the structure of the corner support rod.

[0048] Fig.16 Shows Fig.12 Another cross-sectional view of a fuel cell module.

[0049] Description of reference numerals:

[0050] 110-positioning rod, 120-fixing bracket, 130-contact tooling.

[0051] 260 - first pressing plate, 270 - second pressing plate, 280 - connecting rod.

[0052] 310-Workbench.

[0053] 400-fuel cell module, 410-shell, 411-frame, 411a-first opening, 411b-operating port, 411c-boss, 412-cover plate, 413-packaging plate, 414-operating plate, 415-longitudinal beam, 420-insulating support rod, 421-side support rod, 422-corner support rod, 423-ridge, 424-positioning groove, 431-disc spring support plate, 431a-limiting groove, 432-blind end plate, 433-single cell, 433a-polar plate, 433b-sealant, 433c-carbon paper, 434-core, 435-inlet end plate, 440-cross beam, 450-stack. DETAILED DESCRIPTION

[0054] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0055] The stack (fuel cell stack) includes multiple alternately stacked membrane electrodes and bipolar plates 433a, with seals arranged between the membrane electrodes and the bipolar plates 433a. Insulating plates, current collecting plates, stack end plates and other components are arranged at both ends of the core formed by the membrane electrodes and the bipolar plates 433a to isolate high voltage, collect output energy, provide fastening force, etc. The stack end plates are fastened and connected by strapping bands, tie rods, screws, etc., or the pressing force is provided by the shell. Under the action of the catalysts of the cathode and anode on both sides of the proton exchange membrane inside the membrane electrode, the cathode and anode reaction media undergo electrochemical reactions to convert chemical energy into electrical energy.

[0056] In a certain fuel cell, the end close to the reaction medium input end is defined as the air inlet end, and the end far from the reaction medium input end is defined as the blind end. Correspondingly, the end plate at the air inlet end of the stack is defined as the air inlet end plate, and the end plate at the blind end is defined as the blind end end plate. In a conventional stack, the end plate at the air inlet end, the insulating plate at the air inlet end, the current collecting plate at the air inlet end, the core, the current collecting plate at the blind end, the insulating plate at the blind end, and the end plate at the blind end are stacked in sequence. The direction in which the components of the stack are stacked is defined as the stacking direction.

[0057] The specific definitions of the concepts such as “air inlet end”, “blind end” and “stacking direction” in the present application are referred to above. For the convenience of description, the abbreviations of the definitions are used in the following embodiments.

[0058] The first aspect of the present application provides a method for assembling a fuel cell stack, which is applicable to assembling general power fuel cells as well as assembling ultra-high power fuel cells using short-stroke pressing equipment in related technologies, thereby not affecting the development process of ultra-high power fuel cells.

[0059] See also Figure 1 The stack assembly method provided in the embodiment of the present application includes the following steps:

[0060] S1. Stack the parts of the battery stack in sequence in the positioning space to form a stack. When the height of the stack reaches a first set height H1, stop stacking. Use a pressing device to pre-press the stack in the positioning space, keep the stack 500 in a compressed state for a set time, and remove the pressure on the stack. The first set height H1 is not greater than the height Hmax of the pressure head when the pressing device is at the maximum stroke.

[0061] The parts of the battery stack generally refer to the end plate assembly of the battery stack and multiple single cells, wherein there are two end plate assemblies, one of which is a blind end end plate assembly, including a blind end current collector, a blind end insulating plate, and a blind end end plate. The other is an intake end end plate assembly, including an intake end end plate, an intake end insulating plate, and an intake end current collector. In step S1, stacking the parts of the battery stack in the positioning space can be to first enclose the positioning space, and then place the parts of the battery stack into the positioning space. It is also possible to first place some parts of the battery stack, and then form a positioning space, and then place the parts of the battery stack into the positioning space. In the specific implementation, the parts of the battery stack can be placed in the positioning space manually, and can also be placed in the positioning space by a robot.

[0062] It should also be noted that the height of the stacking body reaching the first set height H1 can be that an end plate assembly and multiple single cells located in the positioning space reach the first set height H1, and the pressure head directly acts on the single cell during pre-pressing. It can also be that one of the end plate assemblies, multiple single cells and another end plate assembly stacked in sequence in the positioning space reach the first set height H1 together, and the pressure head directly acts on the end plate assembly during pre-pressing, which will improve the uniformity of pressure and avoid bending of the single cell.

[0063] The stacking should be stopped before the height of the stack reaches the set height H1, that is, before the height of the stack reaches the height Hmax of the pressure head when the pressing device is at the maximum stroke, so that the pressing device can pre-press the stack. If the height of the stack exceeds the height Hmax of the pressure head when the pressing device is at the maximum stroke, the pressing device cannot pre-press the stack.

[0064] Since the single cell 433 is composed of a membrane electrode and a plate 433a, please refer to Figure 2The membrane electrode is mainly composed of sealant 433b, frame, proton exchange membrane and carbon paper 433c, so the thickness of the membrane electrode is mainly determined by sealant 433b and carbon paper 433c. The height of sealant 433b is generally greater than the thickness of carbon paper 433c. Since sealant 433b is a polymer material with a small cross-sectional size, it will produce a certain permanent deformation after compression, resulting in a decrease in the height of the stack after compression. Carbon paper 433c is a fiber material with a porous structure and is the skeleton of the membrane electrode. It has the functions of supporting the catalyst layer structure, conducting electricity, transferring heat, discharging reaction water, and ensuring that the reaction gas supply reaches the catalyst layer. Due to the structural characteristics of carbon paper 433c itself, it will undergo a certain degree of plastic deformation after compression, and its thickness will decrease.

[0065] During the stacking and pre-pressing process, the sealant 433b will first contact the electrode plate 433a, and then the sealant 433b will be deformed to a certain extent, and the electrode plate 433a will contact the carbon paper 433c on the membrane electrode. As the pre-pressing progresses, the height of the stack 500 decreases. Since the membrane electrode and the carbon paper 433c will have both permanent deformation and certain plastic deformation after compression, the stack will rebound after the pressure is removed after the stack is kept in the compressed state for a certain period of time, but the height after rebound is still less than the first set height H1.

[0066] The pressing device in step S1 may be a press in the prior art, which enables the pressing head to move back and forth in the height direction through hydraulic pressure, thereby pre-pressing the stack 500 .

[0067] S2. Repeat the above steps to continue stacking the remaining parts of the battery stack in the positioning space until all the parts of the battery stack are stacked in the positioning space.

[0068] In step S2, the remaining parts are continuously placed in the positioning space. If the pressure directly acts on the end plate assembly when the stack is kept in a compressed state in the previous step, the end plate assembly needs to be removed from the positioning space first, and then the remaining parts and the end plate assembly are placed, and then a second pre-pressing is performed. If the pressure directly acts on the single battery 433 when the stack is kept in a compressed state in the previous step, the remaining single batteries 433 can be directly placed in the positioning space.

[0069] S3. Press-fit the stack formed by all the parts in the positioning space to a target height H by means of a press-fit device, fasten the stack by means of a fastening assembly to transfer the press-fit force of the press-fit device, and evacuate the press-fit device to complete the assembly of the fuel cell stack.

[0070] When all the single cells 433 and the end plate assemblies are placed in the positioning space, step S3 directly performs a press-fit operation on the stack, that is, using a press-fit device to press all the parts to a target height H, and then tighten them, without pre-pressing, thus saving procedures.

[0071] During the assembly process, the present application controls the height of the stack before each pre-pressing to be no higher than the height Hmax of the pressure head when the pressing device is at the maximum stroke, and then maintains the stack in a compressed state for a set time after pre-pressing, so that the stack rebounds, but the height after rebound is less than the set height H1. At this time, other parts of the battery stack can continue to be added, and pre-pressing and maintaining the compressed state for a set time multiple times can be performed, thereby realizing the assembly of ultra-high power battery stacks using existing short-stroke pressing equipment.

[0072] For the pre-pressing step, in some embodiments, the pre-pressing pressure can be 0.4F to 0.6F, such as 0.42F, 0.43F, 0.44F, 0.45F, 0.46F, 0.47F, 0.48F, 0.49F, 0.5F, 0.51F, 0.52F, 0.53F, 0.54F, 0.55F, 0.56F, 0.57F, 0.58F or 0.59F, etc., wherein F represents the designed fastening force of the stack, that is, the press-fitting equipment pre-presses the stack with a pressure of 0.4F to 0.6F, which can not only achieve the pre-pressing of the stack, but also save energy to ensure efficiency. In other embodiments, the pre-pressing pressure can also be 0.65F or 0.7F, etc., which can also achieve the pre-pressing of the stack.

[0073] The stacked body can be kept in a compressed state by compression of a fixed size or compression of a fixed pressure. The compression of a fixed size and compression of a fixed pressure are described in detail below.

[0074] For fixed-size compression, that is, each time the stack is in a compressed state with the same height dimension, this means that the holding pressure will gradually increase with the increase in the number of battery stack parts. Keeping the stack in a compressed state can specifically include: keeping the stack compressed to a second set height H2, where the second set height H2 can be the same as the target height H of the battery stack, and this can directly use the fastening assembly of the battery stack in the form of a shell package to keep the stack in a compressed state. In other embodiments, the second set height H2 can also be less than the target height H, and the short-stroke pressing equipment can still be used to assemble an ultra-high power battery stack.

[0075] Furthermore, the first set height H1 is set to H

[0076] ​For constant pressure compression, that is, the stack is compressed each time with a set holding pressure, the set holding pressure is the same each time, and the set holding pressure can be the same as the pre-pressing pressure or different from the pre-pressing pressure.

[0077] In constant pressure compression, the set holding pressure may be 0.4F to 0.6F, where F represents the designed tightening force of the battery stack, that is, 40% to 60% of the designed tightening force of the battery stack is set as the holding pressure, which can not only keep the stack 500 in a compressed state for a set time, but also will not crush the single battery 433, thus saving energy. In other embodiments, the set holding pressure may also be 0.7F or 0.75F, etc., which can also keep the stack 500 in a compressed state.

[0078] For the duration of the stack in the compressed state, in some embodiments, the set time of the stack in the compressed state can be 2 to 4 hours, such as 2.1h, 2.2h, 2.3h, 2.4h, 25.h, 2.6h, 2.7h, 2.8h, 2.9h, 3h, 3.1h, 3.2h, 3.3h, 3.4h, 3.5h, 3.6h, 3.7h, 3.8h or 3.9h, etc. The set time of the bottom set pressure is 2 to 4h, so that the single battery 433 undergoes a certain permanent deformation and also has a certain elastic deformation, while also taking into account the assembly efficiency. In other embodiments, the set time can also be 1.8h, 4.3h or 4.5h, and a certain rebound of the stack can also be achieved after the pressure is removed.

[0079] The second aspect of the present application provides a battery stack assembly structure applicable to the battery stack assembly method of any implementation mode of the first aspect.

[0080] The battery stack assembly structure provided in the present application includes a positioning mechanism and a fastening assembly.

[0081] The positioning mechanism is used to form the positioning space, see Figure 3 The positioning mechanism includes a plurality of positioning rods 110 arranged at intervals. The number of the positioning rods 110 can be, for example, four, six or eight. The plurality of positioning rods 110 are arranged around the outside of the battery stack to provide a positioning space. In a specific implementation, at least four positioning rods 110 are provided. Generally speaking, the battery stack is in the shape of a rectangular parallelepiped. At least one positioning rod 110 is provided on each of the four sides of the battery stack. The positioning rods 110 extend along the stacking direction of the battery stack to improve the stacking accuracy of the battery stack.

[0082] The fastening assembly is used to keep the stacking body 450 in a compressed state for a set time, and to fasten the stacking body 450 to transfer the pressing force of the pressing equipment; the fastening assembly is provided with a positioning groove 424 for installing a plurality of positioning rods 110, that is, in addition to compressing the stacking body 450, the fastening assembly is also provided with a structure cooperating with the positioning mechanism, providing an installation position for the positioning mechanism, thereby ensuring the stability of the positioning rod 110, thereby ensuring the assembly accuracy of the battery stack, and the structure is simple.

[0083] The following further explains the stack assembly structure for two cases: a fixed-size compressed stack 450 and a fixed-pressure compressed stack 450.

[0084] For the case where the stack 450 is compressed using a fixed size, and the stack 450 is kept in a compressed state, refer to Figure 4 , Figure 6 as well as Figure 7 The fastening assembly may include a housing 410 , an insulating support rod 420 , and a plurality of beams 440 .

[0085] See also Figure 2 The shell 410 has a first opening 411a so that the parts of the battery stack can be stacked in the shell 410 through the first opening 411a. The lower part of the positioning rod 110 is located in the shell 410, and the upper part of the positioning rod 110 extends out of the shell 410. At least four positioning rods 110 are distributed on the four sides of the shell 410 to form a positioning space.

[0086] See also Figure 6 There are multiple insulating support rods 420, such as four, six, eight or ten, and the insulating support rods 420 have a certain rigidity, and at least the surface of the outer surface that contacts the battery stack and the shell 410 is an insulating material. For example, the insulating support rods 420 can be made of plastic with good rigidity, or the insulating support rods 420 can be made of metal with an insulating layer attached to the outer surface. The material of the insulating support rods 420 must meet the requirements of high hardness, high strength, high insulation and low moisture absorption. A plurality of insulating support rods 420 are spaced apart and distributed on the inner wall of the shell 410 to separate the battery stack from the metal shell 410. The insulating support rods 420 are provided with positioning grooves 424. During the assembly of the battery stack, at least two insulating support rods 420 can be respectively arranged on two adjacent sides of the shell 410. The remaining insulating support rods 420 can be assembled after the fastening assembly fastens the fastening stack 450. The positioning rods 110 located on the two adjacent sides of the shell 410 can be located in the corresponding positioning grooves 424. That is to say, the positioning rods 110 are limited by the positioning grooves 424 of the insulating support rods 420, thereby improving the stability of the positioning rods 110.

[0087] See also Figure 7The crossbeam 440 is detachably connected to the first opening 411a of the shell 410, so that the crossbeam 440 can be connected to the shell 410 when the stack 450 needs to be in a compressed state, and the crossbeam 440 can be separated from the shell 410 when the battery stack parts need to be stacked. There can be two, three or four crossbeams 440, and multiple crossbeams 440 are arranged at intervals and pressed against the stack 450, so as to keep the stack 450 in a compressed state for a set time, and to achieve the fastening of the stack 450 together with the shell 410. The crossbeam 440 is staggered with the positioning rod 110 to avoid interference between the positioning rod 110 and the crossbeam 440. Since the crossbeams 440 are distributed at intervals, the intervals between them can be used for the pressure head of the press to pass through, and will not affect the pressing operation of the press.

[0088] In some embodiments, the housing 410 may be a split structure. Figure 4 The shell 410 includes a frame 411 and a cover plate 412. The frame 411 is provided with a first opening 411a and a second opening. The first opening 411a and the second opening are arranged relatively along the stacking direction of the battery stack. The frame 411 structure can reduce weight and has good strength. The cover plate 412 is connected to the frame 411 and covers the second opening. The cover plate 412 cooperates with the crossbeam 440 to limit the two sides of the stacking direction of the stack 450 respectively so that the stack 450 is in a compressed state. In a specific implementation, the cover plate 412 can be one of the end plates of the battery stack, such as the end plate at the air intake end, to simplify the battery stack structure. It can also be a separately arranged cover plate 412, which is not limited in this application. In the case where the cover plate 412 is one of the end plates of the battery stack, the end plate needs to be connected to the frame 411 first during assembly, and then the insulating support rod 420 is placed.

[0089] See also Figure 2 The side of the frame 411 is provided with an operation opening 411b, but the provision of the operation opening 411b will reduce the structural strength of the side where the operation opening 411b is provided. To improve the strength of the frame 411, in some embodiments, refer to Figure 6 The frame 411 is provided with one or more longitudinal beams 415, and the one or more longitudinal beams 415 are all located in the operation port 411b. The longitudinal beams 415 and the cross beams 440 are staggered and distributed. The cross beams 440 are inserted into the frame 411 from the space in the operation port 411b not occupied by the longitudinal beams 415.

[0090] In some embodiments, the frame 411 is provided with a plurality of bosses 411c spaced apart along the distribution direction of the cross beams 440, and the plurality of bosses 411c are grouped in pairs, and the two bosses 411c in a group form a groove structure, and each cross beam 440 is sandwiched between two adjacent bosses 411c, so that the cross beam 440 can be fixed without bolts, and the cross beam 440 can be prevented from moving during vibration and impact. The height of the boss 411c is not greater than the thickness of the cross beam 440, so that the cross beam 440 can be tightly pressed against the blind end plate 432 assembly of the stack.

[0091] In some embodiments, see Figure 4 The positioning mechanism also includes a fixing bracket 120, which is used to assist in fixing the positioning rod 110, so that the end face of the positioning rod 110 located in the positioning slot 424 facing the stack protrudes outside the positioning slot 424, so that the assembly base of each side of the stack during assembly is the positioning rod 110, and the assembly base of the stack is consistent. In addition, the positioning rod 110 has a high manufacturing accuracy as a tooling part, which further ensures the consistency of the stack during assembly. The structure of the fixing bracket 120 can be designed according to its installation position and the structure of the shell 410, and this application does not limit it. During the assembly process, the first opening 411a is opened as an assembly entrance for the parts of the fuel cell stack. The fixing bracket 120 is installed at the first opening 411a of the shell 410. The portion of the positioning rod 110 extending outside the frame 411 is connected to the fixing bracket 120 so that the positioning rod 110 moves slightly toward the center of the frame 411 (to avoid excessive differences between the assembly reference and the use reference, the thickness difference between the positioning rod 110 and the positioning slot 424, the size of the positioning rod 110 protruding from the positioning slot 424, and the displacement of the positioning rod 110 usually do not exceed 1 mm, for example 0.1 mm). The positioning rod 110 located in the positioning slot 424 partially protrudes from the slot, and the area enclosed by each positioning rod 110 completely matches the outer contour of the core of the fuel cell stack and each component of the blind end. During specific assembly, the fixing bracket 120 can be pre-connected with the positioning rod 110 and the frame 411, and then the position of the positioning rod 110 can be fine-tuned until the positioning rod 110 is adjusted to the target position, and then the fixing bracket 120, the positioning rod 110 and the frame 411 are connected. The fixing bracket 120 can be connected with the positioning rod 110 and the frame 411 by bolts, so as to realize the pre-connection and fixed connection of the fixing bracket 120, the positioning rod 110 and the frame 411.

[0092] In some embodiments, the positioning mechanism may further include a contour tool 130, please continue to refer to Figure 4If the outer envelope of the profiling tool 130 is the same as the outer contour of the core of the stack, or the inner envelope of the profiling tool 130 is the same as the outer contour of the core of the stack, the positioning rod 110 can also be fixed by the profiling tool 130 so that the area surrounded by the positioning rod 110 is completely consistent with the outer contour of each component of the stack. Figure 4 The profiling tool 130 can be used together with the fixed bracket 120. The profiling tool 130 and the fixed bracket 120 can be used together with the positioning rod 110 and the insulating support to achieve that during the battery stack press-fitting process, the core contacts the same part and the same surface as much as possible. The outer envelope surface of the profiling tool 130 is the same as the outer contour of the core of the battery stack, acting as a battery stack simulation, facilitating the fixed bracket 120 to adjust the position of the positioning rod 110. The profiling tool 130 is installed on the first opening 411a side of the frame 411, located in the area surrounded by each positioning rod 110. Each positioning rod 110 can be fixedly connected to the fixed bracket 120 after fitting with the outer envelope surface of the profiling tool 130.

[0093] In other embodiments, the profiling tool 130 can also be used independently, and the inner envelope surface of the profiling tool 130 is the same as the outer contour of the core of the fuel cell stack. A plurality of fixing grooves are arranged inside the profiling tool 130, and the profiling tool 130 is sleeved on the outer side of each positioning rod 110, each positioning rod 110 is embedded in each fixing groove and is flush with the inner envelope surface of the profiling tool 130, and then each positioning rod 110 is fixed to the profiling tool 130.

[0094] During the assembly process, after the fixed bracket 120, the positioning rod 110 and the frame 411 are pre-connected, the position of the positioning rod 110 can be fine-tuned through the profiling tooling 130 until the positioning rod 110 is adjusted to the target position, and then the fixed bracket 120, the positioning rod 110 and the frame 411 are connected, and then the profiling tooling 130 is removed to form a stable positioning space.

[0095] For the case where the constant pressure is used to keep the stack 450 in a compressed state, see Fig.10The locking assembly includes a first pressing plate 260, a second pressing plate 270 and a plurality of spaced connecting rods 280. The connecting rods 280 may be pull rods of the battery stack or screws of the battery stack. Positioning slots 424 are provided on the sides of the first pressing plate 260 and the second pressing plate 270. The connecting rods 280 are connected to the first pressing plate 260 and the second pressing plate 270 and are located in the corresponding positioning slots 424. The connecting rods 280 and the positioning rods 110 are staggered to avoid interference. The two end plates at both ends of the battery stack constitute the first pressing plate 260 and the second pressing plate 270 respectively. During the assembly process, the first pressing plate 260, which is one of the end plates of the battery stack, can be placed in the positioning space first, and the positioning rods 110 can be embedded in the positioning slots 424 of the first pressing plate 260. Then, the other end plate assemblies and multiple single cells 433 at this end of the battery stack can be stacked in sequence in the positioning space. Finally, the second pressing plate 270, which is another end plate of the battery stack, can be placed. At this time, the set height is reached. The pressure head of the pressing equipment is used to apply pressure to the second pressure plate 270, and then the first pressure plate 260 and the second pressure plate 270 are connected by the connecting rod 280. The pressure head rises and the pressure is transferred to the connecting rod 280 and the two end plates of the battery stack, keeping the stack 450 in a compressed state for a set time. The connecting rod 280 is then separated from the first pressure plate 260 and the second pressure plate 270, the pressure on the stack 450 is removed, the second pressure plate 270 is taken out, and the above steps are repeated. Then, multiple single batteries 433 and the second pressure plate 270 are added in turn for pre-pressing and pressure-maintaining.

[0096] In some embodiments, see Figure 7 The positioning rod 110 is connected to the workbench 310 of the pressing equipment. The workbench 310 and multiple positioning rods 110 together form a positioning space. In specific implementation, installation positions with the same number of positioning rods 110 can be set on the workbench 310 of the pressing equipment, and the positioning rods 110 can be installed in the corresponding installation positions. The connection method between the positioning rod 110 and the workbench 310 can be bolt connection or clamping, etc.

[0097] An embodiment of the third aspect of the present application provides a fuel cell module 400 assembled using the fuel cell stack assembly structure of the second aspect.

[0098] See also Fig.12 as well as Fig.13 The fuel cell module 400 includes a shell 410 , a packaging plate 413 , a beam 440 , a fuel cell stack, and an insulating support rod 420 .

[0099] The shell 410 is provided with a first opening 411a, which serves as an assembly port for assembling the various parts of the battery stack. The packaging plate 413 is connected to the shell 410 and covers the first opening 411a to achieve packaging of the battery stack. The battery stack is located in the shell 410 and is pressed against the crossbeam 440; there are multiple insulating support rods 420, which are distributed at intervals and are located between the shell 410 and the battery stack. The insulating support rods 420 are provided with positioning grooves 424 for installing the positioning rods 110. The shell 410, the multiple insulating support rods 420 and the crossbeam 440 jointly apply a fastening force to the battery stack along the stacking direction. There are multiple crossbeams 440, which are distributed at intervals, and can apply a fastening force to the entire surface of the blind end plate 432 assembly, so as to achieve uniform distribution of the pressing force, which can effectively reduce the problem of plate deformation caused by large pressing force of high-power battery stacks. The crossbeam 440 is detachably connected to the shell 410 and is close to the first opening 411a, so as to connect the crossbeam 440 to the shell 410 while keeping the stack 450 in a compressed state, and separate the crossbeam 440 from the shell 410 when the pressure maintenance ends.

[0100] The insulating support rod 420 is a component independent of the housing 410 and the battery stack. Multiple independent insulating support rods 420 are more convenient to install, and the difficulty of assembling the battery stack is low. The insulating support rod 420 is in direct contact with the battery stack. On the one hand, it plays an insulating effect due to its own material. On the other hand, it enables a single part to transmit and transfer external excitation. When external vibration and impact excitation act on the battery stack, it can be transferred to the housing 410 through the insulating support parts that are fully covered on all sides.

[0101] Multiple insulating support rods 420 are distributed at least on each side of the battery stack, that is, the number of multiple insulating support rods 420 is sufficient to set one or more insulating support rods 420 on each side of the battery stack, and the multiple insulating support rods 420 can fully cover the battery stack from all directions, achieving a full coverage and anti-slip effect on the core. In some embodiments, in addition to the number of multiple insulating support rods 420 being sufficient to set one or more insulating support rods 420 on each side of the battery stack, multiple insulating support rods 420 can also be arranged at at least one corner of the battery stack, for example, one or more insulating support rods 420 are arranged at each corner. The multiple insulating support rods 420 distributed at the corners of the battery stack are in contact with two adjacent sides of the battery stack at the same time.

[0102] Taking the rectangular plates with different sides as an example, the number of insulating support rods 420 can be 4, and the 4 insulating support rods 420 are respectively arranged on the 4 sides of the battery stack; the number of insulating support rods 420 can be 6, of which 4 insulating support rods 420 are respectively arranged on the 4 sides of the battery stack, and the remaining 2 insulating support rods 420 can be respectively arranged at two relative corners of the battery stack; the number of insulating support rods 420 can be 8, of which 4 insulating support rods 420 are respectively arranged at the 4 corners of the battery stack, and the remaining 4 insulating support rods 420 can be respectively arranged on the long side and short side of the battery stack. For the convenience of description, the insulating support rods 420 distributed at the corners of the battery stack are referred to as corner support rods 422, and the insulating support rods 420 distributed on the sides of the battery stack are referred to as side support rods 421.

[0103] There are 10 insulating support rods 420, see Fig.13 , wherein the four corner support rods 422 are respectively arranged at the four corners of the stack, the four side support rods 421 are distributed in pairs on each long side of the stack, and the remaining two side support rods 421 are distributed in pairs on each short side of the stack. In some embodiments, the positions of the four side support rods 421 located on the two long sides of the stack can correspond to each other, or can be staggered along the long sides; the positions of the two side support rods 421 located on the two short sides of the stack can correspond to each other, or can be staggered along the short sides.

[0104] In the fuel cell module 400, see Fig.14 The side support rod 421 is provided with a positioning groove 424, and the groove of the positioning groove 424 faces the fuel cell stack. The contact surface between the positioning groove 424 and the fuel cell stack is the end surface of the groove wall, rather than the entire end surface of the side support rod 421 facing the fuel cell stack, so that the contact surface area between the insulating support rod 420 and the fuel cell stack is reduced and does not exceed the projected area of ​​the end surface of the groove wall. After the insulating support rod 420 is manufactured, only the contact surface needs to be fine-machined, which is convenient for achieving high flatness in a limited area, improving the surface quality of the contact surface with the fuel cell stack, and reducing the overall manufacturing difficulty of the insulating support rod 420.

[0105] The positioning groove 424 can be a groove structure formed by removing a portion of material from the insulating support rod 420, or it can be a groove structure formed by setting at least two spaced ridges 423 on the surface of the insulating support rod 420. The side of the insulating support rod 420 facing the battery stack is provided with two parallel ridges 423, and the two ridges 423 form a channel together with the body of the insulating support rod 420 and the outer side of the battery stack. The channel is conductive along the stacking direction, and can not only be used as an airflow channel, but also can be used to install the positioning rod 110 used when the battery stack is assembled, thereby ensuring that the positioning rod 110 used when the battery stack is assembled can be installed using the positioning groove 424 of the side support rod 421, without the need to set up additional positioning rod 110 fixing tooling, reducing the number of tooling parts and facilitating operation.

[0106] In some embodiments, both ends of the insulating support rod 420 are chamfered, and the sharp edges of the chamfers are rounded, and the edges of the ridges 423 are also rounded, so as to facilitate the movement of the single cell 433 during the press-fitting process and the disassembly process, and prevent the single cell 433 or the shell 410 from being damaged during the assembly of the battery stack, and prevent the surface of the single cell 433 from being scratched. In some embodiments, positioning grooves 424 can be provided on both sides of each insulating support rod 420, so that airflow channels are formed between the insulating support rod 420 and the shell 410, and between the insulating support rod 420 and the battery stack, and the weight of the insulating support rod 420 is reduced, so that the weight of the entire fuel cell module 400 is reduced.

[0107] See also Fig.14 , two ridges 423 are provided on both sides of the side support rod 421, and each ridge 423 is perpendicular to the side of the body where it is located, so that the cross section of the side support rod 421 is roughly H-shaped. The cross section of the corner support rod 422 is roughly L-shaped, and the corner support rod 422 contacts both sides of the corner of the battery stack and automatically limits the position in the long side / short side direction of the plate. In some embodiments, please refer to Fig.15 The inner and outer sides of the corner support rod 422 are provided with more than three ridges 423 spaced apart from each other, and each ridge 423 is perpendicular to the side of the body where it is located. The ridges 423 on the outer side of the corner support rod 422 are in contact with the housing 410 .

[0108] In some embodiments, in order to improve uniformity, a number of beams 440 are arranged at intervals along the long side direction of the electrode plate, and the number and arrangement position of the beams 440 are comprehensively determined based on the long side dimension of the blind end plate 432 assembly, the stack pressing force value and other factors. In some embodiments, the number of beams 440 is 3 to 5. A number of beams 440 can be evenly distributed at equal intervals, or unevenly distributed. In some embodiments, the spacing between two adjacent beams 440 located in the middle is less than or equal to the spacing between two adjacent beams 440 located at the edge, so that the distribution of the beams 440 presents a state of being dense in the middle and sparse at both ends. The middle beams 440 are relatively dense, which can provide a larger pressing force to the central area of ​​the stack, and cooperate with the shell 410 located at the edge of the stack to achieve uniform distribution of the pressing force on the entire end surface.

[0109] In some embodiments, see Fig.16 , the crossbeam 440 is parallel to the short side direction of the plate, the insulating support rod 420 is parallel to the stacking direction, and the crossbeam 440 is perpendicular to the insulating support rod 420. Each crossbeam 440 and each insulating support rod 420 can be staggered; or the ends of some insulating support rods 420 can be pressed against the corresponding crossbeam 440, thereby reducing the size of the housing 410 in the distribution direction of the crossbeam 440. Since each crossbeam 44020 is distributed at intervals, the intervals between them can be used for the pressure head of the press to pass through, which will not affect the press assembly operation of the press.

[0110] In some embodiments, please refer to Fig.16 The outer end surface of the disc spring support plate 431 of the stack is provided with a limiting groove 431a, and the position and number of the limiting groove 431a and the cross beam 440 are the same. The cross beam 440 is arranged in the corresponding limiting groove 431a one by one, and the limiting groove 431a further limits the movement of the cross beam 440 during vibration and impact. The groove depth of the limiting groove 431a is not greater than the thickness of the cross beam 440, ensuring that the cross beam 440 can be tightly pressed against the frame 411. The side of the frame 411 is provided with an operation port 411b, which facilitates the cross beam 440 to extend into the shell 410 through the operation port 411b and embed into the limiting groove 431a. After the pressure head leaves the end plate of the blind end, the thickness increases under the action of the resilience of the stack, so that the two ends of the cross beam 440 are respectively pressed against the mouth wall of the operation port 411b and the frame 411, so that the cross beam 440 is stably pressed against the stack 450 and the frame 411. The insulating support rod 420 is attached to the inner wall of the frame 411 , that is, the insulating support rod 420 is located between the battery stack and the frame 411 , thereby achieving physical isolation between the battery stack and the frame 411 .

[0111] In some embodiments, see Fig.12The shell 410 also includes an operation panel 414, which covers the operation port of the frame 210. The stack includes an air intake end plate 435, a core 434, a blind end current collecting plate, a blind end insulating plate, a blind end end plate, and a disc spring support plate, which are sequentially arranged along the stacking direction. The crossbeam and the air intake end plate 435 hold the other structures of the stack together.

[0112] The following takes the case 410 of the fuel cell module 400 including the frame 411 , the air intake end plate (cover plate 412 ) and the packaging plate 413 as an example to describe the assembly method of the fuel cell stack in detail.

[0113] (1) Connect the air intake end plate 432 of the fuel cell stack to the frame 411 so that the air intake end plate 432 covers the second opening of the frame 411 and place the air intake end plate 432 on the workbench 310 of the press-fitting equipment with the air intake end plate 432 facing downward and the first opening 411a of the frame 411 facing upward.

[0114] (2) Several insulating support rods 420 are placed at intervals along two adjacent sides in the frame 411, and the several insulating support rods 420 include both corner support rods 422 and side support rods 421, and the insulating plate at the air inlet end of the battery stack and the current collecting plate at the air inlet end are placed in the inner cavity. In the process of placing these parts into the inner cavity, they move down along the surface of the insulating support rods 420 that have been placed into the inner cavity until they are stacked on the air inlet end plate 432. Some of the parts of the battery stack placed in the inner cavity will contact the insulating support member placed in the inner cavity, covering a part of the notch of the positioning slot 424 of the side support rod 421.

[0115] (3) Please refer to Figure 3 , all the positioning rods 110 are placed in the inner cavity at intervals along the sides of the housing 410, with the lower part of the positioning rod 110 located in the inner cavity and the upper part extending out of the frame 411. At least two positioning rods 110 extend into the positioning slots 424 corresponding to the side support rods 421, and the remaining positioning rods 110 are placed in the installation positions of the insulating support rods 420 of the remaining two adjacent sides and avoid the remaining two adjacent sides. The positioning rods 110 inserted into the positioning slots 424 are blocked by the end plate assembly that has been added, and will be stably set in the positioning slots 424 and will not slide out of the notches of the positioning slots 424.

[0116] (4) After each positioning rod 110 is placed in place, refer to Figure 3 The fixing bracket 120 is placed at the first opening 411a outside the frame 411, and the fixing bracket 120, the positioning rod 110 and the frame 411 are pre-tightened by bolts, and then the contour tooling 130 is placed in the area surrounded by each positioning rod 110, see Figure 4The size of the profiling tooling 130 is the same as the outer contour size of the core. The positions of the positioning rod 110 and the insulating support rod 420 are fine-tuned to ensure that the positioning rod 110 slightly exceeds the positioning slot 424 of the insulating support rod 420. The positioning rod 110 fits the outer contour surface of the profiling tooling 130, and then the bolts are tightened to fix the positions of each positioning rod 110. The profiling tooling 130 is removed, and multiple positioning rods 110 form a stable positioning space.

[0117] (5) Manually stack multiple single cells 433 and blind end plates 432 of the battery stack in sequence in the positioning space, see Figure 5 When the height of the stack 450 reaches the first set height H1, the stacking is stopped, and the stack 450 in the positioning space is pre-pressed by the press-fitting device, and then the crossbeam 440 is inserted into the frame 411 through the operation port 411b and embedded in the limit groove 431a of the blind end plate 432, and the pressure head rises. Figure 7 The crossbeam 440 is pressed against the stacking body 450 and the frame 411, and the pressure is transferred to the crossbeam 440, the frame 411 and the air intake end plate 432 of the fuel cell stack, keeping the stacking body 450 in a compressed state for a set time, and then all the crossbeams 440 are removed through the operating port 411b on the frame 411 to cancel the pressure on the stacking body 450, and the stacking body 450 rebounds to a certain extent.

[0118] (6) Remove the blind end plate 432 assembly in the positioning space, repeat the above steps, and continue to manually stack the remaining parts of the battery stack in the positioning space until all the parts of the battery stack are stacked in the positioning space.

[0119] (7) The stacking body 450 formed by all the parts in the positioning space is pressed to the target height H by means of a pressing device, and the beam 440 is placed in the frame 411 through the operating port 411b of the frame 411 and is located in the limiting groove 431a of the blind end plate 432. The pressing head rises and the pressing force is removed. The beam 440 is pressed tightly against the stacking body 450 and the frame 411, and the pressing force is transferred to the beam 440, the frame 411 and the air intake end plate 432 of the fuel cell stack.

[0120] (8) Place the remaining insulating support rods 420 in the inner cavity of the shell 410 at intervals along the other two adjacent sides of the shell 410. Specifically, first install the insulating support rod 420 on the side of the operating port 411b, and then install the insulating support rod 420 on the other adjacent side. Then, remove all the positioning rods 110, install the high-voltage components and low-voltage components of the fuel cell module 400, and then connect the packaging plate 413 to the frame 411 to cover the first opening 411a, thereby completing the assembly of the fuel cell module 400.

[0121] The present application adopts a method of press-fitting the stack 450 in batches, controlling the first set height H1 not to be higher than the height Hmax of the pressure head when the press-fitting equipment is at the maximum stroke, so as to meet the press-fitting requirements each time. By utilizing the compression characteristics of the membrane electrode and the carbon paper 433c in the stack, it is ensured that the press-fitting equipment can complete the assembly of the stack within 10% of its own press-fitting stroke, shortening the development cycle of the high-power stack and ensuring the normal development of the stack.

[0122] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0123] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0124] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0125] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0126] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for assembling a battery stack, characterized in that: include: The parts of the battery stack are stacked in sequence in the positioning space to form a stack body. When the height of the stack body reaches a first set height H1, the stack body is stopped from being stacked. The stack body in the positioning space is pre-pressed by a press-fitting device to keep the stack body in a compressed state for a set time, and the pressure on the stack body is removed. The first set height H1 is not greater than the height Hmax of the pressure head when the press-fitting device is at the maximum stroke. Repeat the above steps to continue stacking the remaining parts of the battery stack in the positioning space until all the parts of the battery stack are stacked in the positioning space; The stack formed by all the parts in the positioning space is pressed to a target height H by a pressing device, the stack is fastened by a fastening assembly to transfer the pressing force of the pressing device, and the pressing device is evacuated to complete the assembly of the battery stack.

2. The method for assembling a battery stack according to claim 1, characterized in that: The maintaining the stacked body in a compressed state specifically includes: maintaining the stacked body compressed to a second set height H2.

3. The method for assembling a battery stack according to claim 2, characterized in that: The second set height H2 is set to H2 = H; the first set height H1 is set to H < H1 < Hmax.

4. The method for assembling a battery stack according to claim 1, characterized in that: The maintaining the stacked body in a compressed state specifically includes: compressing the stacked body with a set holding pressure.

5. The method for assembling a battery stack according to claim 4, characterized in that: The set holding pressure is 0.4F to 0.6F, wherein F represents the designed tightening force of the battery stack.

6. The method for assembling a battery stack according to any one of claims 1 to 5, characterized in that: The pre-pressing pressure is 0.4F to 0.6F, wherein F represents the designed tightening force of the battery stack.

7. The method for assembling a fuel cell stack according to any one of claims 1 to 5, characterized in that: The set time is 2 to 4 hours.

8. A battery stack assembly structure, applicable to the battery stack assembly method according to any one of claims 1 to 7, characterized in that: The stack assembly structure comprises: A positioning mechanism, comprising a plurality of positioning rods arranged at intervals, wherein the plurality of positioning rods surround the outer side of the battery stack to provide a positioning space; The fastening assembly is used to keep the stack in a compressed state for a set time and to fasten the stack to transfer the pressing force of the pressing device; the fastening assembly is provided with positioning grooves for installing a plurality of the positioning rods.

9. The battery stack assembly structure according to claim 8, characterized in that: The fastening assembly includes a shell, an insulating support rod and a plurality of cross beams. The shell has a first opening. The insulating support rods are provided with a plurality of insulating support rods, which are spaced apart and located on the inner wall of the shell. The insulating support rods are provided with the positioning grooves. The cross beams are detachably connected to the first opening of the shell. The plurality of cross beams are spaced apart and pressed against the stacking body. The lower part of the positioning rods is located in the shell. At least two of the positioning rods are located in the positioning grooves of the insulating support rods. The positioning rods and the cross beams are staggered.

10. The battery stack assembly structure according to claim 9, characterized in that: The shell includes a frame and a cover plate, the frame is provided with the first opening and the second opening, the cover plate is connected to the frame and covers the second opening; the sides of the frame are provided with operation ports, the two ends of the beam are respectively pressed against the port wall of the operation port and the frame, and the insulating support rod is attached to the inner wall of the frame.

11. The battery stack assembly structure according to claim 10, characterized in that: The positioning mechanism further includes a fixing bracket, which is connected to the frame and a portion of the positioning rod located outside the shell, so that an end surface of the positioning rod facing the battery stack protrudes outside the positioning slot; The assembly structure further comprises a profiling tool, the outer envelope surface or the inner envelope surface of the profiling tool being the same as the outer contour of the core of the fuel cell stack.

12. The battery stack assembly structure according to claim 9, characterized in that: The fastening assembly includes a first pressure plate, a second pressure plate and a plurality of spaced-apart connecting rods, the connecting rods are connected to the first pressure plate and the second pressure plate, the sides of the first pressure plate and the second pressure plate are provided with the positioning grooves; the two end plates located at both ends of the fuel cell stack constitute the first pressure plate and the second pressure plate respectively.

13. The battery stack assembly structure according to claim 9, characterized in that: The positioning rods are connected to a workbench of a press-fitting device, and the workbench and a plurality of the positioning rods together form the positioning space.

14. A fuel cell module, assembled using the stack assembly structure according to claims 9-11, characterized in that: The fuel cell module comprises: A shell and a packaging plate, wherein the shell is provided with a first opening, and the packaging plate is connected to the shell and covers the first opening; A plurality of cross beams are spaced apart and are detachably connected to the housing and are close to the first opening; A battery stack, located in the shell and pressed against the crossbeam; A plurality of insulating support rods are distributed at intervals and located between the shell and the battery stack. The insulating support rods are provided with positioning grooves for installing the positioning rods. The shell, the plurality of insulating support rods and the plurality of cross beams jointly apply a fastening force along the stacking direction to the battery stack.

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