Fuel stack packaging mechanism

Abstract

The utility model relates to the technical field of fuel cells, and provides a fuel stack packaging mechanism, the fuel stack packaging mechanism comprises a packaging shell, a floating end plate and a connecting part, the packaging shell is provided with an accommodating cavity for accommodating a stack; the floating end plate is arranged in the accommodating cavity and is used for pressing the electric pile; the connecting part comprises a connecting piece and a fastening piece, the connecting piece is connected to the packaging shell and abuts against the side, away from the electric pile, of the floating end plate, and the fastening piece penetrates through the connecting piece and is connected to the floating end plate. According to the fuel stack packaging mechanism provided by the embodiment of the utility model, the floating end plate is pressed tightly along the stack direction of the stack by abutting against one side of the floating end plate deviating from the stack through the connecting piece, and is fixedly connected with the floating end plate through the fastening piece connected to the connecting piece, so that the position of the floating end plate in the non-stack direction of the stack is ensured to be fixed; therefore, stable press fitting of the electric pile by the floating end plate is realized, and the reliability and vibration resistance of the electric pile in actual operation are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell stack packaging mechanism. Background Art

[0002] A fuel cell is a chemical device that converts the chemical energy of a fuel directly into electrical energy, also known as an electrochemical generator. Fuel cells have the characteristics of high efficiency, low pollution, safety, cleanliness, and high reliability, making them the fourth power generation technology after thermal power, hydropower, and nuclear power generation. It can be seen that from the perspective of energy conservation and ecological environment protection, fuel cells have excellent development prospects.

[0003] As the core component of fuel cells, the stack has high requirements for the working environment and is susceptible to dust, water erosion, and external forces (such as collisions and vibrations), which can cause the stack to leak electricity and hydrogen, or even cause fatal damage to the stack. Therefore, fuel cells must meet requirements such as stack vibration resistance.

[0004] In the prior art, the assembly and compression structure of the fuel cell includes a stack, a packaging box, and a floating end plate. The stack is located in the packaging box and is compressed against the stack by the floating end plate to limit the position of the stack. However, the floating end plate cannot effectively compress the stack, and thus the reliability of the stack cannot be guaranteed in actual operation. Utility Model Content

[0005] The utility model provides a fuel cell stack packaging mechanism, which is used to solve the defect in the prior art that the reliability of the fuel cell stack cannot be guaranteed.

[0006] The utility model provides a fuel cell stack packaging mechanism, comprising a packaging shell, a floating end plate and a connecting component; the packaging shell has a housing cavity for accommodating the fuel cell stack; the floating end plate is arranged in the housing cavity, and the floating end plate is used to press the fuel cell stack; the connecting component comprises a connecting piece and a fastener, the connecting piece is connected to the packaging shell and abuts against a side of the floating end plate away from the fuel cell stack, and the fastener is passed through the connecting piece and connected to the floating end plate.

[0007] According to a fuel cell stack packaging mechanism provided by an embodiment of the utility model, the floating end plate is provided with a threaded blind hole connected to the fastener, and / or the packaging shell is provided with a threaded hole connected to the connector.

[0008] According to a fuel cell stack packaging mechanism provided by an embodiment of the utility model, the end of the connecting member away from the floating end plate has a countersunk hole, and the fastener has a limiting portion arranged in the countersunk hole.

[0009] According to a fuel cell stack packaging mechanism provided by an embodiment of the utility model, the cross section of the countersunk hole and / or the cross section of the limiting portion is polygonal.

[0010] According to a fuel cell stack packaging mechanism provided by an embodiment of the utility model, the connecting component further comprises an elastic member sleeved on the fastener, and the elastic member is limited between the connecting member and the floating end plate.

[0011] According to a fuel cell stack packaging mechanism provided by an embodiment of the utility model, the floating end plate has a flexible member on one side close to the fuel cell stack, and / or the edge of the floating end plate has a positioning component for positioning the fuel cell stack.

[0012] According to a fuel cell stack packaging mechanism provided by an embodiment of the utility model, the positioning component includes at least two stoppers arranged on the edge of the floating end plate, and the at least two stoppers respectively abut against two side surfaces of the fuel cell stack.

[0013] According to a fuel cell stack packaging mechanism provided by an embodiment of the utility model, the positioning component includes a positioning groove opened on the floating end plate, and the positioning groove is used to clamp the fuel cell stack.

[0014] According to a fuel cell stack packaging structure provided by an embodiment of the utility model, the end of the packaging shell away from the connecting component has a detachably connected anode end plate; the anode end plate has a positioning portion for positioning the fuel cell stack.

[0015] According to a fuel cell stack packaging structure provided by an embodiment of the utility model, the connecting components are multiple and arranged at intervals.

[0016] The fuel cell stack packaging mechanism provided by the embodiment of the utility model abuts against the side of the floating end plate facing away from the fuel cell stack through a connecting piece to achieve compression of the floating end plate along the stacking direction of the fuel cell stack, and is fixedly connected to the floating end plate through a fastener connected to the connecting piece to ensure that the position of the floating end plate in the non-stacking direction of the fuel cell stack is fixed, thereby achieving stable press-fitting of the floating end plate on the fuel cell stack, and further ensuring the reliability and vibration resistance of the fuel cell stack in actual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the explosion structure of the fuel cell stack packaging mechanism provided in an embodiment of the utility model.

[0019] Figure 2 It is a schematic diagram of the local structure of the connection between the connection component and the floating end plate provided in an embodiment of the utility model.

[0020] Figure 3 It is a structural schematic diagram of a connecting component provided in an embodiment of the utility model.

[0021] Figure 4 It is a cross-sectional view of a connecting component provided in an embodiment of the utility model.

[0022] Figure numerals: 1. packaging shell; 2. battery stack; 3. floating end plate; 4. flexible part; 5. anode end plate; 7. connecting part; 6. fastener; 61. limiting part. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0024] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0026] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0028] Combine the following Figure 1-Figure 4 The fuel cell stack packaging structure of the embodiment of the utility model is described.

[0029] The utility model embodiment provides a fuel cell stack packaging mechanism, such as Figure 1 and Figure 2 As shown, the fuel cell stack packaging structure includes a packaging shell 1, a floating end plate 3, and a connecting component connected between the floating end plate 3 and the packaging shell 1.

[0030] The packaging shell 1 has a accommodating cavity for accommodating the battery stack 2, and the floating end plate 3 is arranged in the accommodating cavity, and the floating end plate 3 is used to press the battery stack 2; the connecting component includes a connecting piece 7 and a fastener 6, the connecting piece 7 is connected to the packaging shell 1, and abuts against the side of the floating end plate 3 away from the battery stack 2, and the fastener 6 is passed through the connecting piece 7 and connected to the floating end plate 3.

[0031] It can be understood that the battery stack 2 and the floating end plate 3 are both located in the accommodating cavity of the packaging shell 1, and the floating end plate 3 is located between the outer wall of the battery stack 2 and the inner wall of the packaging shell 1. It is connected to the packaging shell 1 through the connecting piece 7 and abuts against the side wall of the floating end plate 3 facing away from the battery stack 2 to achieve the compression of the floating end plate 3, ensuring that the floating end plate 3 is fixed in the stacking direction of the battery stack 2, and the fastener 6 is connected to the connecting piece 7. At the same time, the fastener 6 is fixedly connected to the floating end plate 3 to achieve the fixed connection of the floating end plate 3, ensuring that the floating end plate 3 is fixed in the non-stacking direction of the battery stack 2, thereby achieving stable pressing of the floating end plate 3 on the battery stack 2.

[0032] The fuel cell stack packaging mechanism provided by the embodiment of the utility model is connected to the side of the floating end plate 3 away from the fuel cell stack 2 by the connecting member 7 to realize the compression of the floating end plate 3 along the stacking direction of the fuel cell stack 2, and is fixedly connected to the floating end plate 3 by the fastener 6 connected to the connecting member 7 to ensure that the floating end plate 3 is fixed in the non-stacking direction of the fuel cell stack 2, thereby realizing the stable press-fitting of the floating end plate 3 on the fuel cell stack 2, and further ensuring the reliability and vibration resistance of the fuel cell stack 2 in actual operation.

[0033] It should be noted that if only the connector 7 is used to press the wall of the floating end plate 3 away from the stack 2, the stack 2 and the floating end plate 3 are limited only by the friction between the connector 7 and the floating end plate 3, which can only achieve the limitation in the stacking direction of the floating end plate 3 (that is, the direction in which the connector 7 applies the pressing force to the floating end plate 3, recorded as the Z direction), and cannot achieve the limitation in the non-stacking direction (the X and Y directions perpendicular to the Z direction), so that the stack 2 cannot be effectively pressed, and further the reliability and vibration resistance requirements of the stack 2 cannot be guaranteed. However, the utility model can achieve the compression and fixation of the floating end plate 3 through the cooperation of the connector 7 and the fastener 6, thereby achieving the effective compression of the floating end plate 3 on the stack 2, and further ensuring the airtightness and performance requirements of the stack 2.

[0034] In one embodiment of the utility model, the connector 7 can be a top screw, and a threaded hole matching the connector 7 is provided on the packaging shell 1, and the connector 7 is threadedly connected to the threaded hole of the packaging shell 1, and the connector 7 abuts against the end surface of the floating end plate 3 to achieve the compression of the floating end plate 3 on the battery stack 2. It should be noted here that when the top screw abuts against the end surface of the floating end plate 3, the anti-vibration requirement of the floating end plate 3 is achieved through the friction between the top screw and the floating end plate 3.

[0035] The fastener 6 can be a bolt, the connector 7 is provided with a connection hole that matches the fastener 6, and the floating end plate 3 is provided with a threaded blind hole that connects with the fastener 6. For example, the connection hole on the connector 7 that matches with the fastener 6 is a through hole. After the connector 7 is threadedly connected to the threaded hole of the packaging shell 1 and abuts against the end surface of the floating end plate 3, the fastener 6 is set in the connection hole of the connector 7 and connected to the threaded blind hole of the floating end plate 3 at the same time, so as to fix the floating end plate 3 in position after the floating end plate 3 is pressed against the stack 2.

[0036] In one embodiment of the present invention, as 2 to Figure 4 As shown, the end of the connecting member 7 facing away from the floating end plate 3 has a countersunk hole, and the fastener 6 has a limiting portion 61 arranged in the countersunk hole.

[0037] It can be understood that the countersunk hole on the connector 7 can improve the firmness and stability of the connection of the fastener 6, and the limiting portion 61 of the fastener 6 is placed in the countersunk hole of the connector 7, so that the contact between the fastener 6 and the connector 7 is closer to avoid unscrewing and loosening.

[0038] For example, one end of the connector 7 is threadedly connected to the threaded hole on the packaging shell 1, and the other end of the connector 7 is located inside the packaging shell 1 and is pressed against the floating end plate 3 inside the packaging shell 1, so that the connector 7 is completely placed inside the packaging shell 1, which can protect the quality and appearance of the surface of the packaging shell 1 and prevent the connector 7 from causing damage or scratches to the surface of the packaging shell 1 during installation.

[0039] It is understandable that when the connecting member 7 is sunk into the packaging shell 1 , the fastener 6 connected to the connecting member 7 is also sunk into the packaging shell 1 , thereby further protecting the surface quality and appearance of the packaging shell 1 .

[0040] In one embodiment of the present invention, Figure 3 As shown, the cross section of the countersunk hole is polygonal, and one end of the first rotating member is installed in the countersunk hole, and the first rotating member drives the connecting member 7 to rotate, so as to realize the quick connection between the connecting member 7 and the packaging shell 1. For example, the cross section of the countersunk hole is a regular hexagon; of course, the cross section of the countersunk hole can also be a regular octagon or a quadrilateral or other polygon.

[0041] Furthermore, the cross-section of the limiting portion 61 at the end of the fastener 6 is also polygonal, and one end of the second rotating member is sleeved on the limiting portion 61, and the fastener 6 is driven to rotate by the second rotating member to facilitate the rapid connection of the fastener 6 with the connecting member 7 and the floating end plate 3.

[0042] In one embodiment of the present invention, a certain range of core thickness tolerance can be met by optimizing the sizes of the connector 7 and the fastener 6 .

[0043] It is understandable that due to the thickness tolerance of the membrane electrode and the electrode plate, the fuel cell stack 2 has a core thickness tolerance. Connectors 7 and fasteners 6 of different sizes can be used to achieve the packaging of fuel cell stacks 2 with different core thickness tolerances. Connectors 7 and fasteners 6 of different sizes can be replaced.

[0044] It should be noted that the core thickness tolerance is reduced by reducing the thickness tolerance of the membrane electrode and the electrode plate, so that a certain range of core thickness tolerance can be met by optimizing and adjusting the length specifications of the connector 7 and the fastener 6.

[0045] Furthermore, the connecting component also includes an elastic member (not shown in the figure) sleeved on the fastener 6. The elastic member is limited between the connecting member 7 and the floating end plate 3. The elastic member can also meet a certain range of core thickness tolerance by design. For example, the elastic member can adopt a spring structure.

[0046] In one embodiment of the present invention, Figure 2 As shown, a side of the floating end plate 3 close to the fuel cell stack 2 has a flexible member 4 to prevent damage to the fuel cell stack 2 caused by excessive compression of the floating end plate 3 .

[0047] In one embodiment of the present invention, the edge of the floating end plate 3 has a positioning component (not shown in the figure) for positioning the fuel cell stack 2 .

[0048] It can be understood that the edge of the floating end plate 3 has a positioning component, and the positioning component is used to position the battery stack 2 on the floating end plate 3, so that when the connecting component presses and fixes the floating end plate 3, the floating end plate 3 can position and press the battery stack 2, thereby improving the reliability of the position of the battery stack 2.

[0049] Furthermore, the positioning component may be a stopper disposed on the edge of the floating end plate 3 , and there are at least two stoppers, which respectively abut against two side surfaces of the fuel cell stack 2 .

[0050] It is understandable that when there are more than two stoppers, all the stoppers can be divided into two groups, and the two groups respectively abut against two sides of the battery stack 2 to achieve the positioning of the battery stack 2. Of course, multiple stoppers can also abut against three or four sides of the battery stack 2. For example, when there are three stoppers, three stoppers can be set to abut against three sides of the battery stack 2; when there are four stoppers, four stoppers can be set to abut against four sides of the battery stack 2. Then, when there are more stoppers, all four sides of the battery stack 2 have abutting stoppers.

[0051] In another embodiment of the present invention, the positioning component includes a positioning groove opened on the floating end plate 3, and the positioning groove is used for clamping the fuel cell stack 2.

[0052] It is understandable that the floating end plate 3 has a positioning groove at one end close to the stack 2, and the stack 2 is positioned by the positioning groove. Preferably, a flexible member 4 is provided on the groove wall of the positioning groove to prevent the floating end plate 3 from damaging the stack 2 due to excessive compression.

[0053] In one embodiment of the utility model, the floating end plate 3 is designed as a whole floating plate for pressing the fuel cell stack 2, and the connecting parts are arranged at intervals, and the multiple connecting parts are arranged at intervals, so that the fuel cell stack 2 is evenly stressed during the process of the floating end plate 3 pressing against the fuel cell stack 2.

[0054] In one embodiment of the present invention, Figure 1 As shown, the end of the packaging shell 1 facing away from the connecting component has a detachably connected anode terminal plate 5.

[0055] It can be understood that a accommodating cavity with two through ends is provided in the packaging shell 1, the accommodating cavity is adapted to the size of the bipolar plates of the battery stack 2, the accommodating cavity is used to stack the battery stack 2, the floating end plate 3 is located at one end face of the accommodating cavity, and the anode end plate 5 is located at the other end face of the accommodating cavity, then the floating end plate 3 is located in the accommodating cavity and pressed on the end face of the battery stack 2 away from the anode end plate 5, and the anode end plate 5 has a positioning portion for positioning the battery stack 2.

[0056] For example, a connection hole for the fastening connector to pass through is provided on the anode terminal plate 5, so that the anode terminal plate 5 can be detachably connected to the port of the packaging shell 1 by the fastening connector, so that the anode terminal plate 5 can close the port of the packaging shell 1. In this embodiment, the fastening connector is a bolt.

[0057] The embodiment of the utility model also proposes a fuel cell, including a stack 2 and a fuel stack packaging mechanism provided by any of the above embodiments, the fuel stack packaging mechanism is packaged outside the stack 2, the stack 2 includes bipolar plates and membrane electrode assemblies stacked alternately in sequence, and the fuel stack packaging mechanism is connected to a vehicle. For example, the stack 2 can be a hydrogen fuel stack structure; the fuel cell can be applied to new energy vehicles, electric bicycles and other fields.

[0058] It can be understood that the fuel cell stack packaging mechanism packages the fuel cell stack 2, compresses the floating end plate 3 through the connecting components, and fixes the floating end plate 3 to provide compression force and support for the fuel cell stack 2, which can effectively compress the fuel cell stack 2, improve the impact and shock resistance of the fuel cell stack 2, and ensure the airtightness and performance requirements of the fuel cell stack 2.

[0059] It can be understood that the flexible component provides a flexible compression force for the fuel cell stack 2, and the floating end plate 3 can be tightened by the connecting component to limit the freedom of the floating end plate 3. The tightened floating end plate 3 can effectively achieve effective compression of the stack and improve the vibration resistance and reliability of the fuel cell stack 2.

[0060] In one embodiment of the utility model, the stacking process of the fuel cell is as follows: first, the anode end plate 5 is placed on the tooling, and the single cells are stacked in sequence to form a stack 2, and the floating end plate 3 is placed on the stack 2; then, after the stacking machine is lowered to complete the stacking, the packaging shell 1 is dropped, and the anode end plate 5 is fixed to the end of the packaging shell 1 away from the floating end plate 3 by bolts; finally, the connector 7 is connected to the packaging shell 1, and the connector 7 is tightened as required, so that the connector 7 is pressed against the side of the floating end plate 3 away from the stack 2, and the fastener 6 is installed on the connector 7, and the fastener 6 is fixedly connected to the floating end plate 3 to ensure that the floating end plate 3 is fixed in position in the X and Y directions, thereby ensuring the reliability and vibration resistance of the stack 2 in actual operation.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A fuel cell stack packaging mechanism, characterized in that: include: A packaging shell, wherein the packaging shell has a receiving cavity for receiving the battery stack; A floating end plate, disposed in the accommodating cavity, and used for pressing the battery stack; The connecting component comprises a connecting piece and a fastener, wherein the connecting piece is connected to the packaging shell and abuts against a side of the floating end plate away from the fuel cell stack, and the fastener passes through the connecting piece and is connected to the floating end plate.

2. The fuel cell stack packaging structure according to claim 1, characterized in that: The floating end plate is provided with a threaded blind hole connected to the fastener, and / or, The packaging shell is provided with a threaded hole connected with the connecting piece.

3. The fuel cell stack packaging structure according to claim 1, characterized in that: The end of the connecting member facing away from the floating end plate has a countersunk hole, and the fastener has a limiting portion arranged in the countersunk hole.

4. The fuel cell stack packaging structure according to claim 3, characterized in that: The cross section of the countersunk hole and / or the cross section of the limiting portion is polygonal.

5. The fuel cell stack packaging structure according to any one of claims 1 to 4, characterized in that: The connecting component further comprises an elastic member sleeved on the fastener, and the elastic member is limited between the connecting member and the floating end plate.

6. The fuel cell stack packaging structure according to any one of claims 1 to 4, characterized in that: The floating end plate has a flexible member on one side close to the stack, and / or, The edge of the floating end plate has a positioning component for positioning the fuel cell stack.

7. The fuel cell stack packaging structure according to claim 6, characterized in that: The positioning component includes at least two stoppers arranged on the edge of the floating end plate, and the at least two stoppers are respectively against two side surfaces of the fuel cell stack.

8. The fuel cell stack packaging structure according to claim 6, characterized in that: The positioning component includes a positioning groove opened on the floating end plate, and the positioning groove is used for clamping the fuel cell stack.

9. The fuel cell stack packaging structure according to any one of claims 1 to 4, characterized in that: The end of the packaging shell facing away from the connecting component has a detachably connected anode end plate; the anode end plate has a positioning portion for positioning the battery stack.

10. The fuel cell stack packaging structure according to any one of claims 1 to 4, characterized in that: The connecting components are multiple and arranged at intervals.

Images