Fuel cell packaging structure

Abstract

The application provides a fuel cell packaging structure, comprising a box body and a core unit; the core unit comprises a first end plate, a first current collecting plate, a single cell module, a second current collecting plate, a floating plate, a disc spring assembly, a stacking screw and a second end plate; the first current collecting plate and the second current collecting plate are symmetrically arranged at two ends of the single cell module, the first end plate is arranged on a side of the first current collecting plate away from the single cell module, and the first end plate is in abutment with the single cell module; the floating plate is arranged on a side of the second current collecting plate away from the single cell module, and the floating plate is in abutment with the single cell module; the second end plate is arranged on a side of the floating plate away from the single cell module; the disc spring assembly is arranged between the floating plate and the second end plate; and the stacking screw is symmetrically arranged on two sides of the single cell module. The application has the advantages of simple structure, high space utilization, strong impact resistance and strong vibration resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell, in particular to a fuel cell packaging structure. BACKGROUND

[0002] Fuel cells have many advantages such as clean and high efficiency, and are paid more and more attention by people. With the continuous exploration of fuel cell vehicle application scenarios by various enterprises, the self-owned fuel cell stack gradually develops towards high power. Whether the whole vehicle enterprise or the parts supplier, everyone gradually focuses on the long driving, high power and high load commercial vehicles. However, it is difficult to meet the actual use demand by simply stacking the number of sheets, compared with the excessive pursuit of high power, the key at this stage is to make the reliability and life of the product well.

[0003] The power of common fuel cell stack is mostly 30kW-60kW; with the development of high-power stack, the high-power products of more than 110kW account for the majority. However, the high-power stack is not only the stacking of the number of sheets, because the box of the high-power stack often has problems such as large size, poor resistance to deformation, complex assembly process and the like, therefore, it is urgent to optimize the pole plate, improve the strength of the stack structure components, enhance the stability of the stack structure, improve the impact resistance and enhance the vibration deformation capacity. SUMMARY

[0004] Based on this, the embodiment of the present application provides a fuel cell packaging structure, which aims to solve the problems of insufficient compactness of the existing high-power fuel cell stack structure, waste of internal space of the box, poor layout rationality, complex assembly and disassembly process, long sealing distance, poor impact resistance and poor vibration deformation capacity.

[0005] To achieve the above-mentioned purpose, the embodiment of the present application provides a fuel cell packaging structure, which comprises a box and a core unit.

[0006] The core unit comprises a first end plate, a first current collecting plate, a single cell module, a second current collecting plate, a floating plate, a disc spring assembly, a stacking screw and a second end plate; the first current collecting plate and the second current collecting plate are symmetrically arranged at both ends of the single cell module, the first end plate is arranged on the side of the first current collecting plate away from the single cell module, and the first end plate abuts against the single cell module; the floating plate is arranged on the side of the second current collecting plate away from the single cell module, and the floating plate abuts against the single cell module; the second end plate is arranged on the side of the floating plate away from the single cell module; the disc spring assembly is arranged between the floating plate and the second end plate; the stacking screw is symmetrically arranged on both sides of the single cell module, and one end of the stacking screw is fixedly connected with the first end plate, and the other end is fixedly connected with the second end plate.

[0007] Through the first end plate, the second end plate and the stacking screw, the single cell module and other components can be fastened together to form a whole, so that the structure is compact and the box space is effectively saved.

[0008] As a preferred embodiment, the core unit further comprises a bracket, which is arranged on the side of the second end plate away from the floating plate and is fixed in the box.

[0009] As a preferred embodiment, the bracket is an L-shaped bracket.

[0010] As a preferred embodiment, the first end plate abuts against the end face of one end of the box. In this way, through the bracket and the first end plate, the core unit can be fixedly connected with the box.

[0011] As a preferred embodiment, the first end plate is provided with a first groove matched with the first current collector plate on the side close to the first current collector plate, and the first current collector plate is fixed in the first groove. In this way, the flatness of the plate after the first end plate and the first current collector plate are fixedly matched can be ensured.

[0012] As a preferred embodiment, the first end plate is provided with a first sealing groove on the side close to the box, and a first sealing ring is arranged in the first sealing groove. Through the first sealing ring, the sealing property of the first end plate and the box can be ensured, and the functions of waterproofing and dustproofing can be achieved.

[0013] As a preferred embodiment, the first end plate is provided with a countersunk hole matched with the stacking screw, a sealing member is arranged in the countersunk hole, and a hard sealing ring is arranged in the sealing member.

[0014] As a preferred embodiment, the floating plate is provided with a second groove matched with the second current collector plate on the side close to the second current collector plate, and the second current collector plate is fixed in the second groove. In this way, the flatness of the plate after the floating plate and the second current collector plate are fixedly matched can be ensured.

[0015] As a preferred embodiment, the floating plate is provided with a positioning hole matched with the stacking screw, and the side of the floating plate away from the single cell module is provided with a first circular slot hole matched with the disc spring assembly.

[0016] As a preferred embodiment, the second end plate is provided with a second circular slot hole matched with the disc spring assembly on the side close to the floating plate, and one end of the disc spring assembly is arranged in the first circular slot hole and the other end is arranged in the second circular slot hole.

[0017] As a preferred embodiment, the second end plate is provided with a hole position matched with the stacking screw.

[0018] In the embodiment of the present application, the first end plate can adopt a high-strength and corrosion-resistant plastic end plate; the floating plate is a high-strength plastic plate, which ensures its strength and increases its insulation; and the second end plate is an aluminum alloy metal plate.

[0019] As a preferred embodiment, the disc spring assembly comprises a disc spring, a disc spring positioning pad and a disc spring flat pad; the disc spring is fixed (by internal positioning) on the disc spring positioning pad; and the disc spring flat pad is attached to the surface of the disc spring through the center positioning column of the disc spring positioning pad.

[0020] As a preferred embodiment, the disc spring assembly is provided in multiple groups, and the multiple groups of disc spring assemblies are uniformly arranged between the floating plate and the second end plate. In the embodiment of the present application, the disc spring provides displacement space for the floating plate through the compression and expansion of the disc spring.

[0021] As a preferred embodiment, the stacking screw is arranged in matching with the single battery module. That is, the length of the stacking screw can be determined according to the stacking height of the single battery module, so as to ensure that the screw does not protrude too much from the single battery module after assembly, and also to ensure the locking of the screw nut. In order to ensure insulation, the screw is wrapped with an insulating heat-shrinkable sleeve.

[0022] As a preferred embodiment, the box body comprises a box body, a first box cover, a second box cover, a third box cover and a side cover; the first box cover is arranged on the top end of the box body; the first box cover is provided with a first opening and a second opening, the second box cover is arranged on the first opening, and the third box cover is arranged on the second opening; one side of the box body is provided with a third opening, the side cover is arranged on the third opening, and the side cover is arranged close to the third box cover; the bracket is arranged in the box body; and the first end plate is abutted on the end face of one end of the box body.

[0023] In the embodiment of the present application, the box body is a metal box body. Sealing rings are arranged at the first opening, the second opening and the third opening to provide sealing for each box cover and ensure the sealing of the connection. By arranging the side cover, an operation space can be provided for the installation and removal of the copper bar inside the stack. Through the interference relationship between the box body and the bracket, the core unit can be well fixed with the box body; the top end of the bracket close to the first box cover can be arranged in a supporting shape to place a silica gel gasket, so that the silica gel gasket is in better contact with the first box cover and provides better supporting force.

[0024] As a preferred implementation manner, the top end of the box body is provided with at least two parallel support beams, and the support beams abut against the side surface of the first box cover close to the core unit. The support beams are mainly used to support the side surface of the box body to ensure the flatness and the continuity of the sealing of the box body, and can also provide more support force for the first box cover, and are arranged in the box body, thereby providing sufficient lateral impact support to prevent the side edge of the box body from being broken due to lateral impact. Generally, the support beams can be fixed on the reserved positions of the side walls of the box body through screws, and can be simply disassembled before and after the stacking and unstacking, thereby providing convenience for the operators and reducing the welding processing difficulty of the box body.

[0025] As a preferred implementation manner, the second sealing groove is arranged on the end surface of the box body close to the first box cover, and the second sealing ring is arranged in the second sealing groove. By arranging the second sealing ring, the sealing of the installation of the box body and the first box cover can be provided, and the sealing property of the contact of the two can be ensured.

[0026] As a preferred implementation manner, the shock-absorbing pads are arranged on the side walls of the box body close to the two ends of the second end plate, and the shock-absorbing pads abut against the second end plate. The shock-absorbing pads are generally fixed on the side walls of the box body through screws, and the fixing of the core unit and the box body can be supported through the shock-absorbing pads, and the stability of the fixing can be ensured.

[0027] As a preferred implementation manner, the first box cover is arranged to be matched with the box body.

[0028] As a preferred implementation manner, the battery stack inspection controller is arranged on the third box cover, and a gap is arranged between the battery stack inspection controller and the single battery module. By arranging the battery stack inspection controller on the third box cover, the installation and disassembly of the battery stack inspection controller are facilitated, and the gap is arranged between the battery stack inspection controller and the single battery module, so that a sufficient safety distance is left, and the battery stack inspection controller will not damage the single battery module. Meanwhile, the battery stack inspection controller is arranged on the upper part of the battery stack, the side space in the battery stack can be saved, and the space utilization rate in the battery stack can be effectively improved.

[0029] As a preferred implementation manner, the third box cover is a plastic box cover. The third box cover is a position where the copper bar connecting post of the battery stack is connected, and the plastic box cover can provide high insulation performance for the copper bar connecting post, so as to ensure the electrical clearance and the creepage distance.

[0030] Compared with the prior art, the structure of the application has the following technical effects:

[0031] (1) The application structure is suitable for fuel cell stacks, and can be directly used in the stack structure. In the application structure, by dividing the packaging structure into a core unit and a box, the excessive repeated disassembly steps can be reduced, and the stack plate activation step and the plate airtightness detection step can be advanced, thereby saving time for batch production inspection and reducing production cost.

[0032] (2) The box of the application structure can consider the matching fastening structure of the stack, can reduce the number of more fastening structure parts, and can also reduce the volume of the box; at the same time, the size machining precision of the box can be easily ensured, assembly is facilitated, and the overall consistency of the stack can be effectively improved.

[0033] (3) By arranging the adjustable damping pad structure on the inner side wall of the box, the freedom degree in the side direction of the core unit can be limited in the limited space, thereby effectively enhancing the overall of the stack and improving the anti-oscillation ability of the stack; compared with the prior art, a larger space is saved, and the stability of the core unit in the box is improved.

[0034] (4) By arranging the floating plate which can freely float in the core unit, the effective transmission of the stacking force in the core unit can be ensured while the insulation of the core unit is ensured, the displacement of the floating plate can be freely adjusted for a long time, and the long-term effectiveness of the stacking force is ensured.

[0035] (5) The application structure can realize the overall sealing between the core unit and the box, reaches the protection level standard IP67 of the vehicle fuel cell stack, and the fuel cell impact and vibration test meets the requirements of the national standard. The application effectively improves the space utilization rate in the stack, and has the advantages of simple and stable and reliable structure, strong impact and vibration resistance, and the like. The design problems of the prior art, such as too many parts, complex installation, disassembly and maintenance, deformation failure of the stack after packaging due to impact and vibration, more sealing surfaces of the packaging structure, and complex overall structure design, can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0037] Figure 1 It is an overall structure schematic view of the fuel cell packaging structure of an embodiment of the application.

[0038] Figure 2 It is an overall structure schematic view of the fuel cell packaging structure of an embodiment of the application. Figure 1An exploded structural schematic view of a core unit of a fuel cell packaging structure of the present application;

[0039] Figure 3 An exploded structural schematic view of a core unit of a fuel cell packaging structure of the present application; Figure 1 An exploded structural schematic view of a core unit of a fuel cell packaging structure of the present application;

[0040] Figure 4 An exploded structural schematic view of a core unit of a fuel cell packaging structure of the present application; Figure 2 An exploded structural schematic view of a core unit of a fuel cell packaging structure of the present application;

[0041] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0043] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0044] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element.

[0046] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0047] Specifically, as shown in Figures 1 to 3 The present application provides a fuel cell packaging structure, comprising a box body 10 and a core unit 20;

[0048] The core unit 20 comprises a first end plate 21, a first current collecting plate 22, a single cell module 23, a second current collecting plate 24, a floating plate 25, a disc spring assembly 26, a stacking screw 27 and a second end plate 28; the first current collecting plate 22 and the second current collecting plate 24 are symmetrically arranged at both ends of the single cell module 23, the first end plate 21 is arranged on the side of the first current collecting plate 22 away from the single cell module 23, and the first end plate 21 abuts against the single cell module 23; the floating plate 25 is arranged on the side of the second current collecting plate 24 away from the single cell module 23, and the floating plate 25 abuts against the single cell module 23; the second end plate 28 is arranged on the side of the floating plate 25 away from the single cell module 23; the disc spring assembly 26 is arranged between the floating plate 25 and the second end plate 28; the stacking screw 27 is symmetrically arranged on both sides of the single cell module 23, and one end of the stacking screw 27 is fixedly connected with the first end plate 21, and the other end is fixedly connected with the second end plate 28.

[0049] Through the first end plate 21, the second end plate 28 and the stacking screw 27, the single cell module 23 and other components can be fastened together to form a whole, so that the structure is compact, and the box body space is effectively saved. In the embodiments of the present application, the stacking screw 27 is generally provided with a plurality of stacking screws 27, and the plurality of stacking screws 27 are symmetrically arranged on both sides of the single cell module 23, so as to fasten the single cell module 23 and other components together to form a whole.

[0050] The first end plate is provided with a flow channel groove matched with the single cell module, including a gas inlet, a gas outlet, a cooling water inlet and a cooling water outlet; the inner side of the flow channel groove is an interface with the same shape as the inlet and outlet of the single cell module, the outer side gas inlet and gas outlet are interfaces with the same size, the outer side cooling water inlet and cooling water outlet are larger than the inner side, and the first end plate is offset to the center of the first end plate, the main purpose is to better seal and improve the performance of the whole stack, increase the distance between the pipes on the adapter, and facilitate the installation and connection of the pipeline.

[0051] After the first end plate as a part of the core unit is matched with the box, the gap between the side wall of the first end plate and the box is small, about 0.1mm-1mm, which can play a role in installation and positioning, and if the side wall is subjected to a small lateral impact, the first end plate side wall will also provide lateral compensation support when the box is slightly deformed.

[0052] The first current collecting plate and the second current collecting plate are made of the same material, receive the same reaction area, and only differ in the position of the current collecting plate tab, which is also convenient for distinguishing.

[0053] As a preferred embodiment, the core unit 20 further comprises a bracket 29, which is arranged on the side of the second end plate 28 away from the floating plate 25, and the bracket 29 is fixed in the box 10.

[0054] As a preferred embodiment, the bracket 29 is an L-shaped bracket (made of 45 steel or SUS304 profile). In the embodiment of the application, two brackets 29 are provided, and the two brackets 29 are symmetrically arranged.

[0055] The L-shaped bracket is mainly fixedly connected with the second end plate to fix the core unit and the box to prevent the core unit from moving inside the box. Correspondingly, the lower part of the L-shaped bracket is fixed and locked with the lower bottom of the box through a screw hole, and the upper part is in contact with the first box cover through a support structure with the same shape. In order to ensure good contact and better sealing of the box body, the upper surface of the L-shaped bracket is as flat as possible or slightly lower than the upper surface of the box body. The upper surface of the L-shaped bracket can be attached to a silicone gasket to make good contact with the box cover.

[0056] As a preferred embodiment, the first end plate 21 abuts against the end face of one end of the box 10. In this way, through the bracket 29 and the first end plate 21, the core unit 20 and the box 10 can be fixedly connected.

[0057] As a preferred embodiment, the first end plate 21 is provided with a first groove 211 matched with the first current collecting plate 22 on the side surface close to the first current collecting plate 22, and the first current collecting plate 22 is fixed in the first groove 211. In this way, the flatness of the plate surface after the first end plate 21 and the first current collecting plate 22 are fixedly matched can be ensured.

[0058] As a preferred embodiment, the first end plate 21 is provided with a first sealing groove 212 on the side close to the box 10, and a first sealing ring (not shown in the figure) is arranged in the first sealing groove 212. Through the first sealing ring, the sealing between the first end plate 21 and the box 10 can be ensured, and the waterproof and dustproof effects can be achieved.

[0059] The sealing groove and the sealing strip of the structure of the present application are matched in size and shape, which can effectively ensure the compression rate, filling rate and sealing effectiveness of the sealing strip.

[0060] As a preferred embodiment, the first end plate 21 is provided with a countersunk hole 213 matched with the stacking screw 27, and a sealing member (not shown in the figure) is arranged in the countersunk hole 213, and a hard sealing ring (not shown in the figure) is arranged in the sealing member.

[0061] As a preferred embodiment, the floating plate 25 is provided with a second groove (not shown in the figure) matched with the second current collecting plate 24 on the side close to the second current collecting plate 24, and the second current collecting plate 22 is fixed in the second groove. In this way, the flatness of the plate after the floating plate (high polymer plastic plate) 25 and the second current collecting plate 24 are fixed can be ensured.

[0062] As a preferred embodiment, the floating plate 25 is provided with a positioning hole (not shown in the figure) matched with the stacking screw 27, and the side of the floating plate 25 away from the single battery module 23 is provided with a first circular groove hole 251 matched with the disc spring assembly 26.

[0063] As a preferred embodiment, the second end plate 28 is provided with a second circular groove hole (not shown in the figure) matched with the disc spring assembly 26 on the side close to the floating plate 25, and one end of the disc spring assembly 26 is arranged in the first circular groove hole 251, and the other end is arranged in the second circular groove hole.

[0064] The first circular groove hole and the second circular groove hole are divided into two layers, one layer is a disc spring flat pad contact surface, and the other layer is a small prototype groove in the center, which is a space reserved for the disc spring positioning pad, facilitating the extension and deformation thereof, and adjusting the displacement amount.

[0065] As a preferred embodiment, the second end plate 28 is provided with a hole position 281 matched with the stacking screw 27.

[0066] In the embodiment of the present application, the first end plate 21 can adopt a high-strength, corrosion-resistant plastic end plate; the floating plate 25 is a high-strength plastic plate, which ensures its strength while increasing its insulation; the second end plate is an aluminum alloy metal plate. A gap is left between the second end plate and the floating plate to provide space for the compression deformation of the disc spring assembly.

[0067] As a preferred embodiment, as shown in Figure 4 The disc spring assembly 26 includes a disc spring 261, a disc spring positioning pad 262, and a disc spring flat pad 263; the disc spring 261 is fixed (by internal positioning) on the disc spring positioning pad 262; the disc spring flat pad 263 is attached to the surface of the disc spring 261 away from the disc spring positioning pad 262 through the center positioning column A of the disc spring positioning pad 262.

[0068] As a preferred embodiment, the disc spring assembly 26 is provided with multiple groups, and the multiple groups of disc spring assemblies 26 are uniformly arranged between the floating plate 25 and the second end plate 28. The disc spring 261 provides displacement space for the floating plate 25 through compression and expansion.

[0069] In the embodiment of the present application, the disc spring 261 is provided with four pieces, which are fixed on the disc spring positioning pad in a zygomatic combination by internal positioning, and the disc spring flat pad is attached to the surface of the disc spring away from the disc spring positioning pad through the center positioning column of the disc spring positioning pad.

[0070] There are 10 groups of disc spring assemblies arranged between the floating plate and the second end plate, the second end plate is fixed, and the floating plate moves back and forth to compensate for the displacement and ensure the stacking force, and the size of the disc spring assembly changes with the expansion and contraction; at the same time, the disc spring assembly can store elastic potential energy to maintain the stability of the normal load of the single battery module.

[0071] As a preferred embodiment, the stacking screw 27 is adapted to the single battery module 23. That is, the length of the stacking screw 27 can be determined according to the stacking height of the single battery module 23 to ensure that the screw does not protrude too much after assembly, and also to ensure the locking of the nut. In order to ensure insulation, the screw is wrapped with an insulating heat shrink sleeve.

[0072] There are 12 stacking screws, which are super-long screws that can increase the contact area and reduce the pressure deformation of the first end plate and the second end plate. The head of the stacking screw adopts a hexagonal flange screw and a hexagonal flange nut. The stacking screw is made of metal, and in order to ensure its insulation effect, an insulating heat shrink tube is needed, and the insulating heat shrink tube needs to be ensured without cracking and blistering.

[0073] As a preferred embodiment, the box 10 comprises a box body 11, a first box cover 12, a second box cover 13, a third box cover 14 and a side cover 15; the first box cover 12 covers the top end of the box body 11; the first box cover 12 is provided with a first opening 121 and a second opening 122, the second box cover 13 covers the first opening 121, and the third box cover 14 covers the second opening 122; one side of the box body 11 is provided with a third opening (not marked in the figure), the side cover 15 is arranged on the third opening, and the side cover 15 is arranged close to the third box cover 14; the support 29 is arranged in the box body 11; the first end plate 21 abuts against the end face of one end of the box body 11.

[0074] In the embodiment of the present application, the box 10 is a metal box. Sealing rings are arranged at the first opening, the second opening and the third opening to provide sealing for each box cover and ensure the sealing of the connection. By arranging the side cover, an operating space can be provided for the installation and removal of the copper bars inside the stack. Through the interference relationship between the box body and the support, the core unit and the box can be well fixed; the top end of the support close to the position of the first box cover can be arranged in a supporting shape to place a silica gel gasket, so that it can better contact the first box cover and provide better support force.

[0075] As a preferred embodiment, the top end of the box body 11 is provided with at least two parallel support beams 111, and the support beams 111 abut against the side of the first box cover 12 close to the core unit 20. The support beams 111 are mainly used to support the side of the box body 11 to be flat, to ensure the flatness and the continuity of the sealing of the box body, and also to provide more support force for the first box cover. The support beams are arranged in the box, which also provides sufficient lateral impact support to prevent the side of the box body from being broken and failed due to lateral impact. Generally, the support beams can be fixed on the reserved points of the side wall of the box by screws, which can be simply disassembled before and after the installation and removal of the stack, to provide convenience for the operators and reduce the difficulty of welding processing of the box.

[0076] As a preferred embodiment, the end face of the box body 11 close to the first box cover 12 is provided with a second sealing groove 112, and a second sealing ring (not marked in the figure) is arranged in the second sealing groove 112. By arranging the second sealing ring, the installation of the box body 11 and the first box cover 12 can be sealed to ensure the sealing of the contact between the two.

[0077] As a preferred implementation, the box body 11 is provided with a shock pad 113 on the side wall near both ends of the second end plate 28, and the shock pad 113 is in abutment with the second end plate 28. The shock pad 113 is generally fixed on the side wall of the box body 11 by screws, and through the shock pad 113, a support point can be provided for the fixing between the stack unit and the box, to ensure the stability of the fixing.

[0078] The shock pad is made of polyurethane material, and a screw is integrated inside through thermal bonding. Before the stack unit is matched with the box, the shock pad is installed in advance on the inner side wall of the box body, a total of four, and after installation and tightening, the screw thread on the shock pad is not exposed, and the screw thread is completely sunk into the inner wall of the box. After the stack unit is matched with the box, the L-shaped support is fixed and locked, at this time the stack unit is relatively fixed with the box, the shock pad is rotated outward, the shock pad cannot be disassembled due to size limitation, the polyurethane pad will produce invisible deformation to the naked eye, and the second end plate is tightly pressed.

[0079] The shock pad limits the lateral displacement of the stack unit, increases the contact point position of the lateral and the box body, reduces the fastening screw burden of the L-shaped support, provides more secure support force, and can well reduce the damage of the electric pile caused by side impact and oscillation.

[0080] As a preferred implementation, the first box cover 12 is matched with the box body 11.

[0081] As a preferred implementation, the third box cover 14 is provided with an electric pile inspection controller (not marked in the figure), and a gap is provided between the electric pile inspection controller and the single battery module 23. By installing the electric pile inspection controller on the third box cover, the installation and disassembly are facilitated; a gap is provided between the electric pile inspection controller and the single battery module, so as to leave a sufficient safety distance, so that the electric pile inspection controller will not damage the single battery module. At the same time, the electric pile inspection controller is installed on the upper part of the electric pile, which can save the side space inside the electric pile, and effectively improve the space utilization rate inside the electric pile. The installation of the inspection controller on the third box cover 5 of the upper cover not only facilitates disassembly, but also does not damage the integrity of the box.

[0082] As a preferred implementation, the third box cover 14 is a plastic box cover. The third box cover 14 is the position of the copper bar connection post connected to the outside of the electric pile, and the plastic box cover can provide high insulation performance for it, to ensure the electrical clearance and creepage distance.

[0083] The application structure is suitable for fuel cell stacks, and can be directly used in the stack structure. In the application structure, by dividing the packaging structure into a core unit and a box, excessive repeated disassembly steps can be reduced, and the stack plate activation step and the stack plate air tightness detection step can be advanced, which can effectively improve the assembly efficiency, save time for batch production inspection, reduce production cost, and well ensure the consistency of products.

[0084] The above only describes the preferred embodiments of the application, and does not limit the patent scope of the application. Any equivalent structural transformation made by using the content of the application specification and drawings, or direct / indirect application in other related technical fields under the inventive concept of the application is included in the patent protection scope of the application.

Claims

1. A fuel cell package structure, characterized by comprising: The core unit comprises a first end plate, a first current collector plate, a single cell module, a second current collector plate, a floating plate, a disc spring assembly, a stacking screw and a second end plate. The first current collector plate and the second current collector plate are symmetrically arranged at two ends of the single cell module, the first end plate is arranged on a side of the first current collector plate away from the single cell module, and the first end plate is in abutment with the single cell module; the floating plate is arranged on a side of the second current collector plate away from the single cell module, and the floating plate is in abutment with the single cell module; the second end plate is arranged on a side of the floating plate away from the single cell module; the disc spring assembly is arranged between the floating plate and the second end plate; and the stacking screw is symmetrically arranged at two sides of the single cell module, and one end of the stacking screw is fixedly connected with the first end plate, and the other end is fixedly connected with the second end plate. The core unit further comprises a bracket, the bracket is arranged on a side of the second end plate away from the floating plate, and the bracket is fixed in the box. The bracket is an L-shaped bracket; the first end plate is in abutment with an end face of one end of the box; a first groove matched with the first current collector plate is arranged on a side of the first end plate close to the first current collector plate, and the first current collector plate is fixed in the first groove; A hole matched with the stacking screw is arranged on the second end plate; the disc spring assembly comprises a disc spring, a disc spring positioning pad and a disc spring flat pad; the disc spring is fixed on the disc spring positioning pad; the disc spring flat pad is attached to a surface of the disc spring through a center positioning column of the disc spring positioning pad; a plurality of groups of the disc spring assembly are evenly arranged between the floating plate and the second end plate; and the stacking screw is arranged in matching with the single cell module.

2. The fuel cell package structure according to claim 1, characterized by A first sealing groove is arranged on a side of the first end plate close to the box, and a first sealing ring is arranged in the first sealing groove; A countersunk hole matched with the stacking screw is arranged on the first end plate, a sealing element is arranged in the countersunk hole, and a hard sealing ring is arranged in the sealing element.

3. The fuel cell package structure according to claim 2, wherein A second groove matched with the second current collector plate is arranged on a side of the floating plate close to the second current collector plate, and the second current collector plate is fixed in the second groove; A positioning hole matched with the stacking screw is arranged on the floating plate; a first circular groove matched with the disc spring assembly is arranged on a side of the floating plate away from the single cell module; A second circular groove matched with the disc spring assembly is arranged on a side of the second end plate close to the floating plate; one end of the disc spring assembly is arranged in the first circular groove, and the other end is arranged in the second circular groove.

4. The fuel cell package structure of claim 1, wherein The box body comprises a box body, a first box cover, a second box cover, a third box cover and a side cover; the first box cover covers the top end of the box body; the first box cover is provided with a first opening and a second opening, the second box cover covers the first opening, and the third box cover covers the second opening; one side of the box body is provided with a third opening, the side cover is arranged on the third opening, and the side cover is arranged close to the third box cover; the support is arranged in the box body; the first end plate abuts against the end face of one end of the box body.

5. The fuel cell package structure according to claim 4, wherein The top end of the box body is provided with at least two parallel support beams, and the support beams abut against the side face of the first box cover close to the core unit; The end face of the box body close to the first box cover is provided with a second sealing groove, and the second sealing groove is provided with a second sealing ring.

6. The fuel cell package structure of claim 5, wherein The side wall close to both ends of the second end plate of the box body is provided with a shock pad, and the shock pad abuts against the second end plate.

7. The fuel cell package structure of claim 6, wherein The first box cover is matched with the box body; The third box cover is provided with a battery inspection controller, and a gap is arranged between the battery inspection controller and the single battery module; the third box cover is a plastic box cover.

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