Fuel cell stack structure and packaging forming process

Abstract

The invention discloses a fuel cell stack structure and a packaging forming process, and relates to the technical field of fuel cells, and the fuel cell stack structure comprises a shell, an end plate piece and a cell; the shell is integrally formed through extrusion, and a sliding groove used for installing the supporting guide rail is formed in the inner wall of the shell. The end plates are located at the two opening ends of the shell, and the end plates are detachably connected with the end face of the shell, so that the end plates and the shell define a mounting space; and a plurality of battery cells are stacked in the mounting space and abut against the supporting guide rail. According to the invention, the shell is extruded and integrally formed, the draft angle can be eliminated, and the shell can be cut at will according to the required shell length, so that one set of mold can meet the assembly of any number of battery cells at any height, and the process can be simplified and the packaging cost can be reduced while the shell volume of the fuel cell stack is reduced. In addition, the battery cell can be effectively protected through the supporting guide rail, and vibration and impact influences of the outside on the battery cell are reduced.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and more specifically, to a fuel cell stack structure and packaging molding process. Background Art

[0002] In a fuel cell stack, the housing has a concave portion and a plate that closes the opening of the concave portion, and the concave portion and the plate surround the side of the single cell stack. During the manufacturing process of the concave portion of the housing, a draft angle that expands outward from the housing is formed. When the concave portion with the draft angle is used as a component of the housing, the size of the housing becomes larger.

[0003] In the related art, in order to solve the problem of the large volume of the high-power battery stack packaging shell, the shell is divided into two parts, and the two parts of the shell are die-cast separately, and then the two parts of the shell are welded together by stir friction. Although the above method solves the problem of die-casting process and reduces the problem of the large volume of the packaging shell caused by the large draft angle of the integral die-casting of the shell, the draft angle of the two parts of the shell still exists, and the problem of increased volume caused by the draft angle has not been completely solved. At the same time, the welding process of the two parts of the shell is relatively complicated. The welding part must ensure that the shell can withstand the large battery stack assembly force and ensure the sealing of the shell. This puts strict requirements on the process and quality control, and the packaging cost is relatively high.

[0004] In addition, both parts of the shell are die-cast and have relatively fixed dimensions. The shell can only be equipped with battery cells of fixed height, which cannot meet the needs of different power and different numbers of cells, and thus cannot achieve the scalability of the battery stack height.

[0005] Therefore, how to reduce the shell volume of the fuel cell stack while simplifying the process and reducing the packaging cost has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0006] In view of this, an object of the present application is to provide a fuel cell stack structure, so as to simplify the process and reduce the packaging cost while reducing the shell volume of the fuel cell stack.

[0007] Another object of the present application is to provide a packaging molding process for the above-mentioned fuel cell stack structure.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] A fuel cell stack structure, comprising:

[0010] A housing, wherein the housing is integrally formed by extrusion, the housing has two opening ends arranged opposite to each other, and a slide groove for mounting a support rail is arranged on the inner wall of the housing;

[0011] An end plate, the end plate being located at the two open ends of the shell, and the end plate being detachably connected to the end surface of the shell, so that the end plate and the shell are surrounded to form an installation space;

[0012] There are multiple battery cells, each of which is stacked in the installation space, and the support rail is in contact with each of the battery cells.

[0013] Optionally, in the above fuel cell stack structure, the shell includes a first side plate and a second side plate arranged in pairs, and one of the two first side plates is provided with a plurality of hollow areas, and the other is provided with a plurality of first side plate reinforcing ribs protruding toward a side away from the installation space, and the first side plate reinforcing ribs extend from one end of the shell to the other end;

[0014] The second side plate is provided with a plurality of second side plate reinforcing ribs protruding toward a side away from the installation space, and the second side plate reinforcing ribs extend from one end to the other end of the shell.

[0015] Optionally, in the above-mentioned fuel cell stack structure, a plurality of mounting holes for fixing the end plate are provided on the end surface of the shell, and the mounting holes are provided at both ends of the first side plate reinforcement rib and the second side plate reinforcement rib.

[0016] Optionally, in the above fuel cell stack structure, the end plate comprises an anode end plate for connecting to the anode of the battery cell and a cathode end plate for connecting to the cathode of the battery cell;

[0017] The anode end plate comprises a blind end cover plate, a floating end plate and an anode current collecting plate, the anode current collecting plate is electrically connected to the anode of the battery cell, and the connecting terminal of the anode current collecting plate is located in the hollow area, the blind end cover plate is sealed and connected to the shell through an anode sealing glue line, and the floating end plate is located between the anode current collecting plate and the blind end cover plate;

[0018] The cathode end plate comprises an air intake end plate and a cathode current collecting plate, the cathode current collecting plate is electrically connected to the cathode of the battery cell, and the connecting terminal of the cathode current collecting plate is located in the hollow area, and the air intake end plate is sealed and connected to the shell through a cathode sealing glue line.

[0019] Optionally, in the above-mentioned fuel cell stack structure, a reset elastic member is connected between the floating end plate and the blind end cover plate.

[0020] Optionally, in the above fuel cell stack structure, the air inlet, air inlet, cooling medium inlet, hydrogen outlet, air outlet and cooling medium outlet are respectively provided on the air inlet end plate;

[0021] The hydrogen inlet and the air inlet are both located on a side of the inlet end plate close to the hollow area, the hydrogen outlet and the air outlet are both located on a side of the inlet end plate away from the hollow area, and the hydrogen outlet is on the same side as the air inlet, the air outlet is on the same side as the hydrogen inlet, the cooling medium inlet is on the same side as the air inlet and is located between the hydrogen outlet and the air inlet, and the cooling medium outlet is on the same side as the air outlet and is located between the hydrogen inlet and the air outlet.

[0022] Optionally, in the above fuel cell stack structure, the material of the support rail is a non-metallic material; and / or,

[0023] The shell is made of aluminum alloy.

[0024] A packaging molding process, for the fuel cell stack structure as described in any one of the above items, comprises the steps of:

[0025] Prepare a shell, prepare the shell by extrusion molding, and install the support rail in the slide groove;

[0026] Assemble the battery stack, stack the battery cells in the shell, and abut the battery cells against the support rails, and connect the end plate to the open end of the shell.

[0027] Optionally, in the above packaging molding process, in the step of preparing the shell, it further includes:

[0028] Cutting the shell, cutting the shell along the length direction of the shell according to the height of the battery core;

[0029] Mechanical processing to form a mounting hole on the end surface of the shell;

[0030] Surface treatment is used to remove impurities on the surface of the shell.

[0031] Optionally, in the above packaging and molding process, the step of assembling the battery stack specifically includes:

[0032] Install the cathode end plate, which includes an air intake end plate, a cathode sealant line and a cathode current collecting plate;

[0033] Stacking the battery cells, stacking the battery cells to form a first battery cell group, wherein the cathode of the first battery cell group is connected to the cathode current collecting plate to form a second battery cell group;

[0034] Installing an anode current collecting plate and a floating end plate, wherein the anode current collecting plate is connected to the anode of the second battery cell group, and installing the floating end plate to form a third battery cell group;

[0035] Press-packing: press-packing the third battery cell group to form a fourth battery cell group;

[0036] The shell is assembled, the fourth battery cell is assembled into the shell, the anode sealing wire and the blind end cover are installed, and the blind end cover and the air intake end plate are connected and fixed to the shell by fasteners.

[0037] The fuel cell stack structure provided by the present application is formed by extruding an integrally formed shell and end plates located at the two open ends of the shell to enclose an installation space, and each battery cell can be stacked in the installation space. At the same time, a slide groove for installing a support rail is provided on the inner wall of the shell so that the support rail can abut against each battery cell. As can be seen from the above examples, the fuel cell stack structure provided by the present application can avoid the welding process by extruding the shell into an integral form, and there is no need for drafting, which eliminates the draft angle and reduces the volume of the shell. In addition, the shell is integrally formed, the structure is more stable, can withstand more severe working conditions, and the processing technology is simpler. At the same time, since the shell is prepared by an extrusion molding process, it can be arbitrarily cut according to the required shell length, so that a set of molds can be realized to meet the assembly of any number of battery cell heights, reducing the mold cost, and thus reducing the packaging cost. In addition, the support rail abuts against each battery cell, which can effectively protect the battery cell and reduce the vibration and impact of the outside world on the battery cell.

[0038] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown separately in the drawings can be combined with each other arbitrarily, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of the structure of a fuel cell stack provided in an embodiment of the present application;

[0041] Figure 2 An exploded view of the fuel cell stack structure provided in an embodiment of the present application;

[0042] Figure 3 A cross-sectional view of a fuel cell stack structure provided in an embodiment of the present application;

[0043] Figure 4 A partial cross-sectional view of a fuel cell stack structure provided in an embodiment of the present application;

[0044] Figure 5 An axonometric view of a housing provided in an embodiment of the present application;

[0045] Figure 6 A front view of a housing provided in an embodiment of the present application;

[0046] Figure 7 A top view of a housing provided in an embodiment of the present application;

[0047] Figure 8 Side view of the housing provided in the embodiment of the present application Figure 1 ;

[0048] Fig. 9 Side view of the housing provided in the embodiment of the present application Figure 2 ;

[0049] Fig.10 A cross-sectional view of a housing provided in an embodiment of the present application;

[0050] Fig.11 A flow chart of a packaging molding process provided in an embodiment of the present application;

[0051] Fig.12 A flowchart of preparing a shell provided in an embodiment of the present application;

[0052] Fig.13 A flow chart for assembling a fuel cell stack provided in an embodiment of the present application.

[0053] Wherein, 100 is a housing, 101 is an opening end, 102 is a slide groove, 103 is a support rail, 104 is a first side plate, 1041 is a hollow area, 1042 is a first side plate reinforcement rib, 105 is a second side plate, 1051 is a second side plate reinforcement rib, and 106 is a mounting hole;

[0054] 200 is an end plate, 201 is an anode end plate, 2011 is a blind end cover, 2012 is a floating end plate, 2013 is an anode current collector, 2014 is an anode sealant line, 202 is a cathode end plate, 2021 is an air inlet end plate, 2022 is a cathode current collector, 2023 is a cathode sealant line, 203 is a hydrogen inlet, 204 is an air inlet, 205 is a cooling medium inlet, 206 is a hydrogen outlet, 207 is an air outlet, and 208 is a cooling medium outlet;

[0055] 300 for battery cells. DETAILED DESCRIPTION

[0056] The core of the present application is to provide a fuel cell stack structure, so as to simplify the process and reduce the packaging cost while reducing the shell volume of the fuel cell stack.

[0057] Another core of the present application is to provide a packaging molding process for the above-mentioned fuel cell stack structure.

[0058] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 this field without creative work are within the scope of protection of this application.

[0059] A fuel cell stack generally includes a housing and cells stacked in the housing. The housing has a concave portion and a plate that closes the opening of the concave portion, and the side of the cell stack is surrounded by the concave portion and the plate. During the manufacturing process of the concave portion of the housing, a draft angle extending outward from the housing is formed. When the concave portion with the draft angle is used as a component of the housing, the size of the housing is larger.

[0060] In order to solve the problem of large volume of high-power battery stack packaging shell, in the related technology, the shell is usually divided into two parts, and the two parts of the shell are die-cast separately, and then the two parts of the shell are welded together by stir friction. Although the above method solves the problem of die-casting process and reduces the problem of large volume of the packaging shell caused by the large draft angle of the integral die-casting of the shell, the draft angle of the two parts of the shell still exists, and the problem of increased volume caused by the draft angle has not been completely solved. At the same time, the welding process of the two parts of the shell is relatively complicated. The welding part must ensure that the shell can withstand the large battery stack assembly force and ensure the sealing of the shell. This puts strict requirements on the process and quality control, and the packaging cost is relatively high.

[0061] In addition, both parts of the shell are die-cast and have relatively fixed dimensions. The shell can only be equipped with battery cells of fixed height, which cannot meet the needs of different power and different numbers of cells, and thus cannot achieve the scalability of the battery stack height.

[0062] For this reason, Figure 1 As shown, an embodiment of the present application discloses a fuel cell stack structure, including a shell 100, an end plate 200 and a battery cell 300. By extruding the shell 100 into an integral shape, the welding process can be avoided, and there is no need for drafting, the draft angle is eliminated, and the volume of the shell 100 is reduced. In addition, the shell 100 is integrally formed, the structure is more stable, can withstand more severe working conditions, and the processing technology is simpler. At the same time, since the shell 100 is prepared by an extrusion molding process, the length of the shell 100 can be arbitrarily cut according to the requirements, so that a set of molds can meet the assembly of any number of battery cells 300 of any height, reducing the mold cost, and then reducing the packaging cost. In addition, the support rail 103 abuts against each battery cell 300, which can effectively protect the battery cell 300 and reduce the vibration and impact of the outside world on the battery cell 300.

[0063] The following will be combined Figures 1 to 10 The fuel cell stack structure disclosed in the embodiments of the present application is specifically explained and illustrated.

[0064] like Figure 1 and Figure 2 As shown, the shell 100 can be made of aluminum alloy materials such as Al-Mg-Si through an extrusion one-piece molding process. Compared with high-pressure die-casting materials, the cost of surface treatment is lower, and the corrosion resistance is better. The welding process can be avoided, and there is no need for demolding, which eliminates the demolding angle and reduces the volume of the shell 100. In addition, the shell 100 is integrally molded, the structure is more stable, can withstand more severe working conditions, and the processing technology is simpler. At the same time, since the shell 100 is prepared by an extrusion molding process, the length of the shell 100 can be arbitrarily cut according to requirements, so that a set of molds can meet the assembly of any number of battery cells 300 in height, reducing the mold cost and further reducing the packaging cost. At the same time, the shell 100 has two open ends 101 arranged opposite to each other, and an end plate 200 is provided at each open end 101. The end plate 200 and the end face of the shell 100 can be connected by fasteners such as bolts or detachable connection methods such as snaps, so that the end plate 200 and the shell 100 are surrounded to form an installation space. As shown Figure 1 and Figure 2 As shown, multiple battery cells 300 may be used, and each battery cell 300 may be stacked in the installation space. Figure 3As shown, a slide groove 102 for installing a support rail 103 can be integrally formed on the inner wall of the shell 100, so that the support rail 103 in the slide groove 102 can abut against each battery cell 300, which can effectively protect the battery cell 300 and reduce the vibration and impact of the outside world on the battery cell 300.

[0065] In some embodiments, Figure 5 and Figure 6 As shown, the housing 100 may include a first side plate 104 and a second side plate 105 arranged in pairs, and the first side plate 104 and the second side plate 105 may be provided with a slide groove 102, so that the first side plate 104 and the second side plate 105 may be installed with a support rail 103, so that the vibration and impact of the outside world on each side of the battery cell 300 can be reduced, thereby ensuring the stability of the fuel cell stack structure. Optionally, as Figure 3 and Figure 5 As shown, the slide groove 102 can extend from one end of the housing 100 to the other end, and the slide groove 102 can adopt a T-shaped cross section, and the support rail 103 can adopt a W-shaped cross section that matches the slide groove 102, so that the support rail 103 and the slide groove 102 can be engaged with each other to ensure the installation reliability of the support rail 103. Among them, the support rail 103 can be made of non-metallic materials such as rubber or resin to play a role in buffering and vibration reduction.

[0066] In some embodiments, Figures 5 to 10 As shown, in order to realize the electrical connection between the fuel cell stack and the external equipment, a plurality of hollow areas 1041 are provided on one of the two first side plates 104, so that the stack can be electrically connected to the external equipment through the hollow areas 1041, and a plurality of first side plate reinforcing ribs 1042 protruding toward the side away from the installation space are provided on the other side, and the first side plate reinforcing ribs 1042 can be two, three, four or more, and the first side plate reinforcing ribs 1042 extend from one end of the shell 100 to the other end. In addition, a plurality of second side plate reinforcing ribs 1051 protruding toward the side away from the installation space can also be provided on the second side plate 105, and the second side plate reinforcing ribs 1051 can be two, three or more, and the second side plate reinforcing ribs 1051 extend from one end of the shell 100 to the other end. By providing a plurality of hollow areas 1041 on one of the two first side plates 104, not only can the electrical connection with the external equipment be realized, but also the weight of the shell 100 can be reduced, so as to meet the lightweight requirements of the fuel cell stack. Furthermore, the overall strength and rigidity of the housing 100 can be increased by providing a plurality of first side plate reinforcing ribs 1042 and second side plate reinforcing ribs 1051, thereby improving the stability of the housing 100. It should be noted that a sealing plate is also required to be provided on one side of the hollow area 1041 to ensure the sealing inside the housing 100. The sealing plate is a conventional setting and will not be described in detail herein.

[0067] In some embodiments, Figure 1 and Figure 2 As shown, the end plate 200 includes an anode end plate 201 and a cathode end plate 202. The anode end plate 201 may include a blind end cover 2011, a floating end plate 2012 and an anode current collector 2013. The anode current collector 2013 is electrically connected to the anode of the battery cell 300, and the connection terminal of the anode current collector 2013 is located in the hollow area 1041 so as to be connected to the anode of an external device. The blind end cover 2011 is sealed and connected to the housing 100 through an anode sealant line 2014. At the same time, the floating end plate 2012 may be located between the anode current collector 2013 and the blind end cover 2011, and may float along with the thermal expansion and contraction deformation of the battery cell 300, thereby ensuring the safety of the fuel cell stack structure. The cathode end plate 202 may include an air intake end plate 2021 and a cathode current collecting plate 2022. The cathode current collecting plate 2022 is electrically connected to the cathode of the battery cell 300, and the connection terminal of the cathode current collecting plate 2022 is located in the hollow area 1041 so as to be connected to the cathode of an external device. At the same time, the air intake end plate 2021 is sealed and connected to the housing 100 through a cathode sealant line 2023. Optionally, as Figure 4 As shown, the blind end cover plate 2011 and the air intake end plate 2021 are respectively provided with receiving grooves for receiving the anode sealant line 2014 and the cathode sealant line 2023, so that the air intake end plate 2021 and the blind end cover plate 2011 can be completely fitted with the flange surface of the shell 100, respectively. The receiving groove can play a role of limiting, and at the same time can prevent the sealant line from being crushed due to overpressure, and can also prevent the problem of insufficient compression resulting in poor sealing, such as Figure 4 It should be noted that Figure 4 It is only a schematic diagram of the flange surface of the air intake end plate 2021 being fitted with the shell 100, and the way the blind end cover plate 2011 is fitted with the flange surface of the shell 100 is the same as that of the air intake end plate 2021, which will not be repeated herein.

[0068] In some embodiments, in order to achieve floating of the floating end plate 2012 accompanying the thermal expansion and contraction deformation of the battery cell 300, a resetting elastic member may be connected between the floating end plate 2012 and the blind end cover plate 2011, and one end of the resetting elastic member may be connected to the floating end plate 2012, and the other end of the resetting elastic member may be connected to the blind end cover plate 2011, so that the floating end plate 2012 can float along with the thermal expansion and contraction deformation of the battery cell 300 under the elastic force of the resetting elastic member. The floating end plate 2012 may be made of insulating materials such as plastic.

[0069] In some embodiments, in order to achieve the connection and fixation between the air intake end plate 2021 and the blind end cover plate 2011 and the open end 101 of the housing 100, as shown in FIG. Figure 2 and Figure 5As shown, a plurality of mounting holes 106 for fixing the end plate 200 may be provided on the end surface of the housing 100, and mounting holes 106 are provided at both ends of the first side plate reinforcement rib 1042 and the second side plate reinforcement rib 1051. Optionally, the mounting holes 106 may be threaded holes, and light holes corresponding to the mounting holes 106 at both ends of the housing 100 are provided on the air intake end plate 2021 and the blind end cover plate 2011, respectively, so that the air intake end plate 2021 and the blind end cover plate 2011 can be connected and fixed to the open end 101 of the housing 100 respectively by fasteners such as bolts.

[0070] In some embodiments, Figure 1 and Figure 3 As shown, the air inlet end plate 2021 may be provided with a hydrogen inlet 203, an air inlet 204, a cooling medium inlet 205, a hydrogen outlet 206, an air outlet 207 and a cooling medium outlet 208. The hydrogen inlet 203 may be used to introduce fuel gas such as hydrogen as a reactant of the anode, while the air inlet 204 may introduce combustion-supporting gas such as air or pure oxygen and transport it to the cathode, and an electrochemical reaction may occur to generate electric energy under the action of the electrolyte. Moreover, the residual fuel gas and combustion-supporting gas may be discharged from the hydrogen outlet 206 and the air outlet 207, respectively. In addition, the cooling medium inlet 205 may be introduced with a special antifreeze or water or other coolant, which absorbs the heat generated by the battery cell 300 and then increases in temperature, and then flows out from the cooling medium outlet 208, and then dissipates the heat to the surrounding environment through heat dissipation components such as a radiator, and the cooled coolant flows into the battery cell 300 from the cooling medium inlet 205 again, and this cycle is repeated to maintain the temperature stability of the fuel cell stack. Optionally, the hydrogen inlet 203 and the air inlet 204 may both be located on the side of the inlet end plate 2021 close to the hollow area 1041, and the hydrogen outlet 206 and the air outlet 207 are both located on the side of the inlet end plate 2021 away from the hollow area 1041. At the same time, the hydrogen outlet 206 and the air inlet 204 are on the same side, and the air outlet 207 and the hydrogen inlet 203 are on the same side. In addition, the cooling medium inlet 205 and the air inlet 204 are on the same side and are located between the hydrogen outlet 206 and the air inlet 204, and the cooling medium outlet 208 and the air outlet 207 are on the same side and are located between the hydrogen inlet 203 and the air outlet 207, so that the gas in the flow channel can be discharged while the cooling medium flows in to absorb the heat generated by the battery cell 300.

[0071] like Fig.11 As shown, the embodiment of the present application also discloses a packaging molding process, which is aimed at the fuel cell stack structure disclosed in the above embodiment, so the fuel cell stack structure has all the technical effects of the above fuel cell stack structure, which will not be repeated here. Among them, the packaging molding process includes step S100 of preparing the shell and step S200 of assembling the stack.

[0072] The following will be combined Figures 11 to 13 The packaging molding process disclosed in the embodiment of the present application is specifically explained and illustrated.

[0073] Step S100, preparing a shell;

[0074] The housing 100 is prepared by extrusion molding, and the support rail 103 is installed in the integrally formed slide groove 102. Specifically, in step S100, when preparing the housing, Fig.12 As shown, the process also includes step S101 of cutting the shell, step S102 of machining, and step S103 of surface treatment.

[0075] Step S101 , cutting the shell, cutting the shell 100 along the length direction of the shell 100 according to the height of the stacked battery cells 300 , so that the shell 100 can completely surround the side surfaces of the stacked battery cells 300 .

[0076] Step S102 : machining, preparing mounting holes 106 on two end surfaces of the housing 100 by punching, drilling or other machining methods.

[0077] Step S103 : surface treatment to remove burrs, dust and other impurities on the surface of the housing 100 .

[0078] After the shell 100 is prepared, step S200 may be performed to assemble the battery stack.

[0079] Step S200, assembling a battery stack;

[0080] Each battery cell 300 is stacked in the housing 100, and each battery cell 300 abuts against the support rail 103, and the end plate 200 is connected to the open end 101 of the housing 100. Fig.13 As shown, step S200 of assembling the battery stack may specifically include step S201 of installing the cathode end plate, step S202 of stacking the battery cells, step S203 of installing the anode current collecting plate and the floating end plate, step S204 of press fitting, and step S205 of installing the shell.

[0081] Step S201 , installing the cathode end plate, installing the cathode sealant wire 2023 in the receiving groove of the air intake end plate 2021 , and installing the cathode current collecting plate 2022 at the same time.

[0082] Step S202 , stacking battery cells, stacking the battery cells 300 to form a first battery cell group, and connecting the cathode of the first battery cell group to the cathode current collecting plate 2022 to form a second battery cell group.

[0083] Step S203 , installing an anode current collecting plate and a floating end plate, connecting the anode current collecting plate 2013 to the anode of the second battery cell group, and installing the floating end plate 2012 to form a third battery cell group.

[0084] Step S204 , press-fitting the third battery cell group to form a fourth battery cell group. Press-fitting the third battery cell group can facilitate smooth flow of electrons between the battery cells 300 .

[0085] Step S205, assemble the shell and assemble the fourth battery cell into the shell 100, install the anode sealant wire 2014 in the receiving groove of the blind end cover 2011, and connect and fix the blind end cover 2011 and the air intake end plate 2021 to the shell 100 by fasteners such as bolts, thereby completing the assembly of the fuel cell stack.

[0086] The terms "first" and "second" and the like in the specification and claims of this application and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0087] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fuel cell stack structure, characterized in that: include: A housing (100), the housing (100) being integrally formed by extrusion, the housing (100) having two opening ends (101) arranged opposite to each other, and a slide groove (102) for mounting a support rail (103) being arranged on an inner wall of the housing (100); an end plate (200), the end plate (200) being located at the two open ends (101) of the shell (100), and the end plate (200) being detachably connected to an end surface of the shell (100), so that the end plate (200) and the shell (100) are surrounded to form an installation space; A battery cell (300), wherein the battery cell (300) is multiple, each of the battery cells (300) is stacked in the installation space, and the support rail (103) abuts against each of the battery cells (300).

2. The fuel cell stack structure according to claim 1, characterized in that: The shell (100) comprises a first side plate (104) and a second side plate (105) arranged in a pair, and one of the two first side plates (104) is provided with a plurality of hollow areas (1041), and the other is provided with a plurality of first side plate reinforcing ribs (1042) protruding toward a side away from the installation space, and the first side plate reinforcing ribs (1042) extend from one end of the shell (100) to the other end; The second side plate (105) is provided with a plurality of second side plate reinforcing ribs (1051) protruding towards a side away from the installation space, and the second side plate reinforcing ribs (1051) extend from one end of the shell (100) to the other end.

3. The fuel cell stack structure according to claim 2, characterized in that: A plurality of mounting holes (106) for fixing the end plate (200) are provided on the end surface of the shell (100), and the mounting holes (106) are provided at both ends of the first side plate reinforcing rib (1042) and the second side plate reinforcing rib (1051).

4. The fuel cell stack structure according to claim 2, characterized in that: The end plate (200) comprises an anode end plate (201) for connecting to the anode of the battery cell (300) and a cathode end plate (202) for connecting to the cathode of the battery cell (300); The anode end plate (201) comprises a blind end cover plate (2011), a floating end plate (2012) and an anode current collecting plate (2013); the anode current collecting plate (2013) is electrically connected to the anode of the battery cell (300), and the connection terminal of the anode current collecting plate (2013) is located in the hollow area (1041); the blind end cover plate (2011) is sealed to the shell (100) via an anode sealing rubber line (2014); and the floating end plate (2012) is located between the anode current collecting plate (2013) and the blind end cover plate (2011); The cathode end plate (202) comprises an air intake end plate (2021) and a cathode current collecting plate (2022); the cathode current collecting plate (2022) is electrically connected to the cathode of the battery cell (300); and the connection terminal of the cathode current collecting plate (2022) is located in the hollow area (1041); the air intake end plate (2021) is sealed and connected to the shell (100) via a cathode sealing glue line (2023).

5. The fuel cell stack structure according to claim 4, characterized in that: A resetting elastic member is connected between the floating end plate (2012) and the blind end cover plate (2011).

6. The fuel cell stack structure according to claim 4, characterized in that: The air inlet end plate (2021) is respectively provided with a hydrogen inlet (203), an air inlet (204), a cooling medium inlet (205), a hydrogen outlet (206), an air outlet (207) and a cooling medium outlet (208); The hydrogen inlet (203) and the air inlet (204) are both located on a side of the inlet end plate (2021) close to the hollow area (1041); the hydrogen outlet (206) and the air outlet (207) are both located on a side of the inlet end plate (2021) away from the hollow area (1041); the hydrogen outlet (206) and the air outlet (207) are on the same side as the air inlet (204); the air outlet (207) and the hydrogen inlet (203) are on the same side; the cooling medium inlet (205) and the air inlet (204) are on the same side and located between the hydrogen outlet (206) and the air inlet (204); and the cooling medium outlet (208) and the air outlet (207) are on the same side as the air outlet (207) and located between the hydrogen inlet (203) and the air outlet (207).

7. The fuel cell stack structure according to any one of claims 1 to 6, characterized in that: The material of the support rail (103) is a non-metallic material; and / or, The shell (100) is made of aluminum alloy.

8. A packaging molding process, characterized in that: The fuel cell stack structure according to any one of claims 1 to 7 comprises the following steps: Prepare a shell, prepare the shell (100) by extrusion molding, and install the support rail (103) in the slide groove (102); The battery stack is assembled, each of the battery cells (300) is stacked in the shell (100), each of the battery cells (300) is abutted against the support rail (103), and the end plate (200) is connected to the open end (101) of the shell (100).

9. The packaging molding process according to claim 8, characterized in that: The step of preparing the housing (100) further includes: Cutting the shell, cutting the shell (100) along the length direction of the shell (100) according to the height of the battery cell (300); Mechanical processing to form a mounting hole (106) on the end surface of the housing (100); Surface treatment is performed to remove impurities on the surface of the shell (100).

10. The packaging molding process according to claim 8, characterized in that: The steps of assembling the battery stack specifically include: Installing a cathode end plate, wherein the cathode end plate (202) comprises an air intake end plate (2021), a cathode sealing rubber line (2023) and a cathode current collecting plate (2022); Stacking the battery cells, stacking the battery cells (300) to form a first battery cell group, wherein the cathode of the first battery cell group is connected to the cathode current collecting plate (2022) to form a second battery cell group; Installing an anode current collecting plate and a floating end plate, wherein the anode current collecting plate (2013) is connected to the anode of the second battery cell group, and installing the floating end plate (2012) to form a third battery cell group; Press-packing: press-packing the third battery cell group to form a fourth battery cell group; The housing is assembled, the fourth battery cell is assembled into the housing (100), the anode sealing wire (2014) and the blind end cover plate (2011) are installed, and the blind end cover plate (2011) and the air intake end plate (2021) are connected and fixed to the housing (100) via fasteners.

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