High voltage component of fuel cell stack, fuel cell stack and assembly method

Abstract

The present invention discloses a high-voltage component of a fuel cell stack, a fuel cell stack, and an assembly method, which solve the technical problems of weak insulation and difficult assembly of existing high-voltage components. The high-voltage component includes a copper busbar assembly, an insulating member, an output component, and a connecting component. The copper busbar assembly includes a first copper busbar connected to the intake end collector plate and a second copper busbar connected to the blind end collector plate; the insulating member has a first mounting plate and a second mounting plate arranged at an angle, and the first mounting plate and the second mounting plate are closer to the housing of the fuel cell stack than the copper busbar assembly; the output component passes through the first mounting plate, and the output component includes a first terminal and a second terminal; the connecting component passes through the second mounting plate, and the connecting component includes a first connecting member connecting the first terminal and the first copper busbar and a second connecting member connecting the second terminal and the second copper busbar. The positioning of the output component and the copper busbar assembly can be achieved by the insulating member, which reduces the difficulty of assembly and meets the insulation requirements.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell technology, and in particular to a high-voltage component of a fuel cell stack, a fuel cell stack, and an assembly method. Background Art

[0002] Fuel cell stacks typically consist of multiple cells connected in series, resulting in high output voltages and stringent electrical safety requirements. Fuel cell power output is typically achieved through high-voltage copper busbars. In existing designs, one end of the high-voltage busbar is connected to the stack current collector and the other end to the DC converter (DCDC) terminal. Due to the limited internal space within the fuel cell stack, the high-voltage busbars typically require structural avoidance and surface insulation treatment to meet electrical clearance and creepage distance requirements, complicating the busbar structure.

[0003] The fuel cell stack in the prior art has technical problems such as weak insulation of high-voltage components and great difficulty in assembly. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to overcome the shortcomings of the existing technology and provide a high-voltage component of a fuel cell stack, a fuel cell stack and an assembly method to meet the insulation requirements, so that during the stack assembly process, the positioning of the output component and the copper busbar component can be determined by the insulating part while the shell is fastened and assembled, without the need for additional tooling to assist in assembly, thereby reducing the difficulty of assembly.

[0005] The solution to achieve the technical purpose of the present invention is a high-voltage component of a fuel cell stack, comprising:

[0006] A copper bar assembly, comprising a first copper bar connected to the inlet end header plate of the stack and a second copper bar connected to the blind end header plate of the stack;

[0007] an insulating member having a first mounting plate and a second mounting plate disposed at an angle, wherein the first mounting plate and the second mounting plate are closer to the housing of the fuel cell stack than the copper busbar assembly;

[0008] an output assembly passing through the first mounting plate, the output assembly comprising a first terminal and a second terminal;

[0009] A connecting assembly passes through the second mounting plate, wherein the connecting assembly includes a first connecting piece connecting the first terminal and the first copper busbar and a second connecting piece connecting the second terminal and the second copper busbar.

[0010] Furthermore, the high-voltage assembly further includes at least one limiting member, the limiting member having a limiting groove, and the first copper bar and / or the second copper bar is located in the limiting groove.

[0011] Furthermore, the limiting member includes a first clamping plate and a second clamping plate that are spaced apart, the first clamping plate and the second clamping plate are both parallel to the first copper bar and the second copper bar, and the first clamping plate and the second clamping plate form a limiting groove.

[0012] Furthermore, the opening of the limiting groove is provided with a guide angle.

[0013] Furthermore, the first copper bar and the second copper bar are both provided with mounting holes for mounting the connection assembly, and the size of the mounting holes of the first copper bar / the second copper bar is larger than the size of the corresponding first connector / the second connector.

[0014] Furthermore, a guide tube structure for the connecting assembly to pass through is provided on the second mounting plate.

[0015] Based on the same inventive concept, the present invention also provides a fuel cell stack, comprising:

[0016] A housing having a mounting cavity, the housing comprising a first housing and a second housing connected thereto;

[0017] A stack body is arranged in the installation cavity;

[0018] The above-mentioned high-voltage component, the copper bar assembly, insulating part and connecting assembly of the high-voltage component are all arranged in the installation cavity; the first copper bar is connected to the air inlet end collecting plate of the stack body, and the second copper bar is connected to the blind end collecting plate of the stack body; the output assembly and the insulating part are both connected to the second shell.

[0019] Furthermore, the second shell is a cover plate, the side plate of the first shell close to the second shell is a frame structure, and the cover plate covers the frame structure.

[0020] Furthermore, the second shell is provided with a boss, the second shell is provided with a threaded hole passing through the boss, a third connecting member is provided in the threaded hole, and the first mounting plate is connected to the boss through the third connecting member.

[0021] Based on the same inventive concept, the present invention also provides an assembly method for assembling the above-mentioned fuel cell stack, which is characterized by comprising the following steps:

[0022] Connecting the first copper bar and the second copper bar of the copper bar assembly to the air inlet end collecting plate and the blind end collecting plate of the stack respectively;

[0023] The stack is mounted on the first housing to obtain a first sub-assembly; the output component and the insulating member are mounted on the second housing to obtain a second sub-assembly;

[0024] The first subassembly and the second subassembly are assembled, and the output assembly and the copper busbar assembly are connected via a connecting assembly to obtain the fuel cell stack.

[0025] It can be seen from the above technical solution that the high-voltage assembly of the fuel cell stack provided by the present invention includes a copper busbar assembly, an insulating member, an output assembly and a connecting assembly; wherein: the copper busbar assembly includes a first copper busbar connected to the air intake end collecting plate of the stack body and a second copper busbar connected to the blind end collecting plate of the stack body; the insulating member has a first mounting plate and a second mounting plate connected at an angle, and the first mounting plate and the second mounting plate are closer to the shell of the fuel cell stack than the copper busbar assembly, and are used to separate the copper busbar assembly and the shell to achieve insulation. The output assembly includes a first terminal and a second terminal passing through the first mounting plate; the connecting assembly passes through the second mounting plate, and the connecting assembly includes a first connecting piece connecting the first terminal and the first copper busbar and a second connecting piece connecting the second terminal and the second copper busbar, that is, the copper busbar assembly and the output assembly are connected on the inner side of the insulating piece close to the core, and the first mounting plate and the second mounting plate of the insulating piece can simultaneously achieve insulation from the shell in two side directions of the copper busbar assembly, and during installation, the output assembly and the insulating piece are first installed on the shell in advance. Since the output assembly and the connecting assembly pass through the first mounting plate and the second mounting plate respectively, the positioning of the output assembly and the copper busbar assembly can be determined by the insulating piece while the shell is buckled and assembled, thereby realizing the assembly positioning of the high-voltage copper busbar of the battery stack during the assembly of the battery stack, without the need for additional design of tooling to assist in assembly, reducing the difficulty of assembly, and being able to achieve high-power battery stack power output while taking into account electrical safety.

[0026] The present invention also provides a fuel cell stack, comprising a shell, a stack body and the above-mentioned high-voltage assembly; wherein the shell has an installation cavity, and the shell comprises a first shell and a second shell connected; the stack body is arranged in the installation cavity; the copper busbar assembly, the insulating member and the connecting member of the high-voltage assembly are all arranged in the installation cavity; the first copper busbar is connected to the air intake end collecting plate of the stack body, and the second copper busbar is connected to the blind end collecting plate of the stack body; the output assembly and the insulating member are both connected to the second shell, that is, during installation, the stack body is pre-fixed to the first shell, and the output assembly and the insulating member are both installed on the second shell in advance. Since the output assembly and the connecting assembly pass through the first mounting plate and the second mounting plate respectively, the positioning of the output assembly and the copper busbar assembly can be determined by the insulating member while the shell is buckled and assembled, thereby realizing the assembly positioning of the high-voltage copper busbar of the stack during the stack assembly process, without the need to additionally design tooling to assist in assembly, reducing the difficulty of assembly, and being able to achieve high-power stack power output while taking into account electrical safety.

[0027] The present invention also provides an assembly method for assembling the above-mentioned fuel cell stack, comprising the following steps:

[0028] Connect the first copper bar and the second copper bar of the copper bar assembly to the air inlet end header and the blind end header of the stack respectively;

[0029] The stack body is mounted on the first housing to obtain a first sub-assembly; the output component and the insulating member are mounted on the second housing to obtain a second sub-assembly, and the output component is positioned by the first mounting plate of the insulating member;

[0030] The first subassembly and the second subassembly are assembled, and the output assembly and the copper busbar assembly are connected through a connecting assembly to obtain a fuel cell stack. Since the connecting assembly needs to pass through the second mounting plate of the insulating part, the positioning of the output assembly and the copper busbar assembly, as well as the positioning of the connecting assembly and the output assembly are achieved through the insulating part, thereby ensuring the implementation of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An exploded diagram illustrating the installation and connection between the high-voltage assembly and the housing provided in Example 1 of the present invention;

[0032] Figure 2 for Figure 1 Schematic diagram of the first copper busbar of the high-voltage component;

[0033] Figure 3 for Figure 1 A schematic structural diagram of the second copper busbar of the high-voltage component;

[0034] Figure 4 for Figure 1 A schematic structural diagram of an insulating member of a high voltage assembly;

[0035] Figure 5 for Figure 4 A schematic side view of an insulating member of a high voltage assembly;

[0036] Figure 6 for Figure 1 A schematic structural diagram of a limiter of a high-voltage component;

[0037] Figure 7 A schematic structural diagram of a high-voltage assembly, a current collecting plate, and a housing of a fuel cell stack provided in Example 2 of the present invention;

[0038] Figure 8 for Figure 7 A front view of a fuel cell stack in FIG.

[0039] Figure 9 for Figure 7 Left side view of the fuel cell stack in FIG;

[0040] Figure 10 It is a sectional view taken along line AA in FIG8 ;

[0041] Figure 11 for Figure 8 BB cross-sectional view in;

[0042] Figure 12 for Figure 9 The CC section view in the figure;

[0043] Figure 13 for Figure 9 Schematic diagram of the high-pressure operating cover of the shell.

[0044] Description of reference numerals:

[0045] 100-high-voltage assembly, 110-copper busbar assembly, 111-first copper busbar, 112-second copper busbar, 113-mounting hole, 114-connecting hole, 120-insulating member, 121-first mounting plate, 122-second mounting plate, 123-guide tube structure, 124-avoidance structure, 130-output assembly, 131-first terminal, 132-second terminal, 140-connecting assembly, 141-first connecting member, 142-second connecting member, 150-limiting member, 151-limiting groove, 152-first clamping plate, 153-second clamping plate, 154-shoulder;

[0046] 200-housing, 210-first housing, 211-boss, 220-second housing, 221-high-pressure operation cover; 300-intake end collecting plate, 400-blind end collecting plate; 500-third connecting piece. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to which this application belongs to understand this application more clearly, the technical solution of this application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0048] In order to solve the technical problems of weak insulation and difficult assembly of high-voltage components of fuel cell stacks in the prior art, the present invention provides a high-voltage component of a fuel cell stack, a fuel cell stack, and an assembly method, which meet the insulation requirements and can determine the positioning of the output component and the copper busbar component through the insulating member while the shell is fastened and assembled during the stack assembly process, without the need for additional tooling to assist in assembly, thereby reducing the difficulty of assembly. The technical content of the present invention is described in detail below through three specific embodiments:

[0049] Example 1

[0050] The high-voltage assembly 100 of the fuel cell stack provided by the present invention includes a copper busbar assembly 110, an insulating member 120, an output assembly 130 and a connecting assembly 140; wherein: the copper busbar assembly 110 includes a first copper busbar 111 connected to the air intake end collecting plate 300 of the stack body and a second copper busbar 112 connected to the blind end collecting plate 400 of the stack body; the insulating member 120 has a first mounting plate 121 and a second mounting plate 122 connected at an angle, and the first mounting plate 121 and the second mounting plate 122 are closer to the shell of the fuel cell stack than the copper busbar assembly 110, and are used to separate the copper busbar assembly 110 and the shell to achieve insulation. The output assembly 130 includes a first terminal 131 and a second terminal 132 that pass through the first mounting plate 121; the connecting assembly 140 passes through the second mounting plate 122, and the connecting assembly 140 includes a first connector 141 that connects the first terminal 131 and the first copper bar 111 and a second connector 142 that connects the second terminal 132 and the second copper bar 112, that is, the copper bar assembly 110 and the output assembly 130 are connected on the inner side of the insulating member 120 close to the core, and the first mounting plate 121 and the second mounting plate 122 of the insulating member 120 can be simultaneously connected to the copper bar assembly 110. Insulation is achieved with the shell in two side directions, and the output component 130 and the insulating component 120 are installed on the shell in advance during installation. Since the output component 130 and the connecting component 140 pass through the first mounting plate 121 and the second mounting plate 122 respectively, the output component 130 and the copper busbar component 110 can be positioned by the insulating component 120 while the shell is snapped together and assembled, thereby realizing the assembly positioning of the high-voltage copper busbar of the battery stack during the assembly of the battery stack. No additional tooling auxiliary assembly is required, which reduces the difficulty of assembly and can achieve high-power battery stack power output while taking into account electrical safety.

[0051] In existing designs, a single copper bar in the copper bar assembly 110 of a fuel cell stack is connected to the stack current collector at one end and to the DC converter (DCDC) terminal, i.e., the output assembly 130, at the other end. In a single fuel cell stack, at least one of the first copper bar 111 and the second copper bar 112 is relatively long. To support the longer first copper bar 111 and / or second copper bar 112 and ensure electrical safety, in this embodiment, the high-voltage assembly 100 further includes at least one retaining member 150 having a retaining groove 151, into which the first copper bar 111 and / or the second copper bar 112 are positioned.

[0052] The present invention does not limit the structure of the position-limiting member 150; as long as it has a position-limiting slot 151 and meets the clearance requirements between the core and the shell, the position-limiting member 150 will suffice. In one embodiment, the position-limiting member 150 includes a first clamping plate 152 and a second clamping plate 153 spaced apart. The first clamping plate 152 and the second clamping plate 153 are both parallel to the first copper bar 111 and the second copper bar 112, and the gap between the first clamping plate 152 and the second clamping plate 153 constitutes the position-limiting slot 151.

[0053] To facilitate assembly, in this embodiment, the opening of the limiting groove 151 is provided with a guide angle to guide the first copper bar 111 / the second copper bar 112 to align with the limiting groove 151. The guide angle can be obtained by rounding or chamfering, and is not specifically limited in this embodiment.

[0054] In order to take into account the ease and convenience of assembly, the present embodiment designs the limiter 150 to be pre-connected to the shell, and when the shell is assembled and connected, it just clamps the corresponding first copper bar 111 and / or second copper bar 112. In order to connect the limiter 150 to the shell and prevent the threaded connector from being too close to the fuel cell core, in the present embodiment, the limiter 150 also has a boss 154, and the first clamping plate 152 and the second clamping plate 153 are connected to the two opposite sides of the boss 154, and the limiter 150 is connected to the shell through the boss 154. In order to simplify the structure and ensure the sealing of the connection between the limiter 150 and the shell, preferably, a through hole for the threaded connector to pass through is provided on the boss 154, and the diameter of the through hole is 0.5 to 1 mm larger than the diameter of the selected threaded connector.

[0055] In order to ensure the connection position between the limiting member 150 and the shell, in this embodiment, the mounting plate limiting member 150 and the shell are positioned by adaptive bosses and grooves, and the limiting member 150 is provided with bosses and / or grooves.

[0056] The present invention does not impose any specific restrictions on the cross-sectional shapes of the bosses and grooves, and they can be selected based on design requirements. For ease of design, preferably, in this embodiment, the bosses are truncated, the grooves are circular, and the bosses on the stopper 150 are 0.1mm to 0.5mm larger in diameter than the corresponding grooves on the housing, while the grooves on the stopper 150 are 0.1mm to 0.5mm smaller in diameter than the corresponding bosses on the housing.

[0057] This embodiment does not impose any specific restrictions on the material of the limiting member 150, as long as it can ensure support and limitation while meeting the insulation requirements. For example, as an implementation method, the material of the high-voltage copper busbar limiting plate can be PA6.

[0058] In order to set up the connection assembly 140 and connect the copper busbar assembly 110 with the output assembly 130, in this embodiment, the first copper busbar 111 and the second copper busbar 112 are each provided with a mounting hole 113 for mounting the connection assembly 140. Because the actual assembly dimensions of the fuel cell stack in the stacking direction deviate from the theoretical dimensions, and the position of the copper busbars may also deviate, to reduce the risk of assembly failure, in this embodiment, the dimensions of the mounting holes 113 of the first copper busbar 111 / second copper busbar 112 are both larger than the corresponding dimensions of the first connector 141 / second connector 142. Preferably, the mounting holes 113 are circular holes, the connection assembly 140 is a bolt, and the diameter of the mounting holes 113 is 2mm to 5mm larger than the selected bolt, allowing for certain deviations in all directions.

[0059] Due to the large length and complex structure of the high-voltage copper busbar, as well as processing errors during the manufacturing process, the actual copper busbar structure deviates from the theoretical state. This makes the assembly of the high-voltage copper busbar and the high-voltage feed-through terminal difficult. In addition, due to the dimensional consistency of different single-cell batteries, especially the dimensional differences in the battery series connection direction, the actual dimensions of the entire series connection direction after actual assembly of multiple single-cell batteries will inevitably deviate from the theoretical design dimensions.

[0060] In order to prevent the first connector 141 and the second connector 142 from falling off when connecting the copper busbar assembly 110 and the output assembly 130 , in this embodiment, a guide tube structure 123 for the connecting assembly 140 to pass through is provided on the second mounting plate 122 .

[0061] In order to allow a certain deviation between the actual assembly size and the theoretical size of the fuel cell stack in the stacking direction, reserve adjustable space for the connecting component 140, and reduce the risk of the connecting component 140 being unable to be assembled in the guide tube structure 123, in this embodiment, the guide tube diameter is 0.5 to 1 mm larger than the distance between the bolts.

[0062] Similarly, in order to achieve the connection between the copper busbar assembly 110 and the collecting plate, the first copper busbar 111 and the second copper busbar 112 are respectively provided with connection holes 114 for connecting the intake end collecting plate 300 and the blind end collecting plate 400. In order to ensure positioning, there are more than two mounting holes 113 on the first copper busbar 111 and the second copper busbar 112.

[0063] In order to reserve connection fault tolerance, in this embodiment, the diameter of the connection hole 114 is 1 mm to 2 mm larger than the diameter of the selected connection bolt, allowing a fault tolerance of 2 mm in each direction to meet assembly requirements.

[0064] Since the output assembly 130 needs to pass through the first mounting plate 121 , in order to facilitate installation, in this embodiment, two through holes are provided on the plate to avoid the high-voltage through terminals. The size of the through holes is 0.2 to 1 mm larger than that of the high-voltage through terminals.

[0065] Similarly, to facilitate assembly, this solution pre-connects the insulating member 120 to the housing. In this embodiment, a through-hole is provided on the first mounting plate 121 for mounting and securing the insulating member 120 to the housing. The threaded connector passes through the through-hole on the first mounting plate 121 and connects to the housing. Preferably, the diameter of the through-hole is 0.5 to 1 mm larger than the diameter of the fixing bolt.

[0066] A high-voltage component 100 provided in this embodiment can realize the assembly positioning of the output component 130 and the copper busbar component 110 during the stack assembly process through the insulating part 120, without the need for additional tooling design, meeting the high-voltage design fault tolerance requirements of the stack during the stack integration process, allowing a certain deviation between the actual assembly size and the theoretical size of the fuel cell stack in the stacking direction, reducing the risk of the stack being unable to be assembled, realizing high-power stack power output, and taking into account electrical safety.

[0067] Example 2

[0068] Based on the same inventive concept, this embodiment provides a fuel cell stack, including a shell 200, a stack body and the above-mentioned high-voltage assembly 100; wherein the shell 200 has an installation cavity, and the shell 200 includes a first shell 210 and a second shell 220 connected; the stack body is arranged in the installation cavity; the copper bar assembly 110, the insulating member 120 and the connecting assembly 140 of the high-voltage assembly 100 are all arranged in the installation cavity; the first copper bar 111 is connected to the inlet end collector 300 of the stack body, and the second copper bar 112 is connected to the blind end collector 400 of the stack body; the output assembly 130 and the insulating member 120 are both connected to the second shell 2 20, that is, during installation, the stack body is pre-fixed to the first shell 210, and the output component 130 and the insulating member 120 are pre-installed on the second shell 220. Since the output component 130 and the connecting component 140 pass through the first mounting plate 121 and the second mounting plate 122 respectively, the output component 130 and the copper busbar component 110 can be positioned by the insulating member 120 while the shell 200 is snapped together and assembled, thereby realizing the assembly positioning of the high-voltage copper busbar of the stack during the assembly of the stack. No additional tooling auxiliary assembly is required, which reduces the difficulty of assembly and can achieve high-power stack power output while taking into account electrical safety.

[0069] This application does not limit the specific structure and block structure of the housing 200, as long as it meets the packaging requirements. As an embodiment, to ensure smooth assembly and achieve operability and observability during the assembly process, the second housing 220 is a cover plate. To strengthen the overall structural strength of the housing 200, in this embodiment, the side plate of the first housing 210 close to the second housing 220 is a frame structure, and the cover plate covers the frame structure, so that the frame structure provides all-round support for the second cover plate, ensuring the strength of the housing 200 under external impact.

[0070] In order to avoid the need for additional sealing structures and simplify the overall structure and installation of the fuel cell stack, preferably, the insulating part 120 and the limiting part 150 both adopt a solution of screwing threaded fasteners from the inside of the shell 200, that is, the head of the threaded fastener is in the installation cavity and the rod does not pass through the second shell 220.

[0071] Since the present embodiment adopts the second shell 220 with a cover plate structure, the cover plate has technical problems of thick bottom and thin bottom, and insufficient screwing size of the bolts. In order to ensure the screwing length and connection strength of the bolts between the cover plate and the limiter 150 and the insulating member 120, in the present embodiment, the second shell 220 is provided with a boss 211, and the second shell 220 is provided with a threaded hole passing through the boss 211. A third connecting member is provided in the threaded hole, and the first mounting plate 121 is connected to the boss 211 through the third connecting member. At this time, the gap between the second shell 220 and the copper busbar assembly 110 becomes smaller due to the presence of the boss 211. At this time, the first mounting plate 121 further ensures insulation safety. The stack insulation protection plate is L-shaped, and the vertical part of the L-shape realizes the isolation of the copper busbar from the side of the shell 200, and the horizontal part realizes the isolation between the cover plate and the copper busbar assembly 110.

[0072] Because a window for installing the connection assembly 140 is required on the side of the housing 200, in this embodiment, the housing 200 also includes a high-pressure operation cover plate 221 for sealing the frame housing 200. Preferably, the high-pressure operation cover plate 221 is made of aluminum alloy. Preferably, the high-pressure operation cover plate 221 is provided with a number of through holes for installing and sealing the required bolts, and the diameter of the through holes is 0.5 to 1 mm larger than the diameter of the bolts.

[0073] As in Example 1, in order to ensure the connection position between the limiter 150 and the housing 200, in this embodiment, the mounting plate limiter 150 and the housing 200 are positioned by means of matching bosses 211 and grooves, and a boss 211 and / or a groove is provided on the limiter 150. The present invention does not specifically limit the cross-sectional shape of the boss 211 and the groove, which can be selected according to design requirements. For ease of design, preferably, in this embodiment, the boss 211 is a frustum, the groove is a circular groove, and the boss 211 on the limiter 150 is 0.1mm to 0.5mm larger than the diameter of the corresponding groove on the housing 200, and the groove on the limiter 150 is 0.1mm to 0.5mm smaller than the diameter of the corresponding boss 211 on the housing 200.

[0074] Similarly, since the present embodiment adopts a second shell 220 with a cover structure, the cover has technical problems of being thick at the bottom and thin at the bottom, and insufficient screwing size of the bolts. In order to ensure the threaded screwing length and connection strength of the cover and the limiter 150, in the present embodiment, the boss 211 is arranged on the cover, and the groove is arranged on the limiter 150, that is, the groove and the through hole of the limiter 150 for installing the threaded connector together constitute a stepped hole, and the large hole section of the stepped hole is used to accommodate the boss 211 corresponding to the groove.

[0075] In order to ensure the smooth installation of other structures of the fuel cell stack in the installation cavity, in this embodiment, a avoidance structure 124 for avoiding the purge outlet of the frame shell 200 is provided on the second installation plate 122 of the stack insulation part 120, and the avoidance structure 124 forms an L-shaped notch on the second installation plate 122.

[0076] Example 3

[0077] Based on the same inventive concept, this embodiment provides an assembly method for assembling the above-mentioned fuel cell stack, comprising the following steps:

[0078] Connect the first copper bar 111 and the second copper bar 112 of the copper bar assembly 110 to the air inlet end header 300 and the blind end header 400 of the stack respectively;

[0079] The stack is mounted on the first housing 210 to obtain a first sub-assembly; the output assembly 130 and the insulating member 120 are mounted on the second housing 220 to obtain a second sub-assembly, with the output assembly 130 being positioned by the first mounting plate 121 of the insulating member 120;

[0080] The first subassembly and the second subassembly are assembled, and the output assembly 130 and the copper busbar assembly 110 are connected through the connecting assembly 140 to obtain a fuel cell stack. Since the connecting assembly 140 needs to pass through the second mounting plate 122 of the insulating part 120, the positioning of the output assembly 130 and the copper busbar assembly 110 and the positioning of the connecting assembly 140 and the output assembly 130 are achieved through the insulating part 120, thereby ensuring the implementation of the assembly.

[0081] In summary, the present invention provides a high-voltage component of a fuel cell stack, a fuel cell stack, and an assembly method. The first mounting plate and the second mounting plate of the insulating member can simultaneously achieve insulation from the shell in both lateral directions of the copper busbar assembly, and during installation, the output component and the insulating member are both installed on the shell in advance. Since the output component and the connecting component pass through the first mounting plate and the second mounting plate respectively, the positioning of the output component and the copper busbar assembly can be determined by the insulating member while the shell is snapped together during the stack assembly process. No additional tooling auxiliary assembly is required, which reduces the difficulty of assembly. The fault tolerance requirements of the high-voltage design of the stack during the stack integration process are met through a variety of fault-tolerant designs, allowing the actual assembly size of the fuel cell stack in the stacking direction to have a certain deviation from the theoretical size, reducing the risk of the stack being unable to be assembled, and being able to achieve high-power stack power output while taking into account electrical safety.

[0082] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0083] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A fuel cell stack, characterized in that: include, A housing having a mounting cavity, the housing comprising a first housing, a second housing and a high-voltage operating cover plate connected thereto; A stack body is arranged in the installation cavity; A high-voltage assembly, including a copper busbar assembly, an insulating member, and a connecting assembly, all of which are disposed in the mounting cavity; the copper busbar assembly includes a first copper busbar connected to the inlet-end current collector of the stack and a second copper busbar connected to the blind-end current collector of the stack; the insulating member includes a first mounting plate and a second mounting plate arranged at an angle, the first mounting plate and the second mounting plate being closer to the housing of the fuel cell stack than the copper busbar assembly; an output assembly passes through the first mounting plate, the output assembly including a first terminal and a second terminal; the connecting assembly passes through the second mounting plate, the connecting assembly including a first connecting member connecting the first terminal and the first copper busbar, and a second connecting member connecting the second terminal and the second copper busbar; In which, the stack is fixed to the first shell; the output assembly and the insulating member are both connected to the second shell; the output assembly and the copper busbar assembly are positioned by the insulating member when the shells are snapped together and assembled; a window for installing the connecting assembly is provided on the side of the shell, and the high-voltage operation cover covers the window to seal the shell, and the high-voltage operation cover is provided with a through hole for installing and sealing the required connecting assembly.

2. The fuel cell stack according to claim 1, wherein: The high-voltage assembly further includes at least one limiting member having a limiting groove, and the first copper bar and / or the second copper bar are located in the limiting groove.

3. The fuel cell stack according to claim 2, wherein: The limiting member includes a first clamping plate and a second clamping plate that are spaced apart. The first clamping plate and the second clamping plate are both parallel to the first copper bar and the second copper bar. The first clamping plate and the second clamping plate form a limiting groove.

4. The fuel cell stack according to claim 2, wherein: The opening of the limiting groove is provided with a guide angle.

5. The fuel cell stack according to any one of claims 1 to 4, characterized in that: The first copper bar and the second copper bar are both provided with mounting holes for mounting the connection assembly, and the size of the mounting holes of the first copper bar / the second copper bar is larger than the size of the corresponding first connector / the second connector.

6. The fuel cell stack according to any one of claims 1 to 4, characterized in that: The second mounting plate is provided with a guide tube structure for the connecting assembly to pass through.

7. The fuel cell stack according to any one of claims 1 to 4, characterized in that: The second shell is a cover plate, the side plate of the first shell close to the second shell is a frame structure, and the cover plate covers the frame structure.

8. The fuel cell stack according to claim 7, wherein: The second shell is provided with a boss, and the second shell is provided with a threaded hole passing through the boss. A third connecting member is provided in the threaded hole, and the first mounting plate is connected to the boss through the third connecting member.

9. An assembly method for assembling a fuel cell stack according to any one of claims 1 to 8, characterized in that: The following steps are involved: Connecting the first copper bar and the second copper bar of the copper bar assembly to the air inlet end collecting plate and the blind end collecting plate of the stack respectively; Installing the stack body to the first shell to obtain a first sub-assembly; Installing the output component and the insulating member in the second housing to obtain a second sub-assembly; The first subassembly and the second subassembly are assembled, and the output assembly and the copper busbar assembly are connected via a connecting assembly to obtain the fuel cell stack.

Images