Electric pile and fuel cell
By setting up support and tie rod structures inside the fuel cell core, the core is separated into multiple segments, the problem of core offset and waist collapse under large acceleration is solved, the battery performance and structural strength are improved, and the battery is simplified. Troubleshooting.
Patent Information
- Application Number
- CN202323277635.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-01
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-01
Smart Images
Figure CN222168450U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fuel cells, in particular to a battery stack and a fuel cell. Background Art
[0002] Proton exchange membrane fuel cells are gaining more and more attention from all walks of life due to their many advantages, especially in the automotive industry. As an excellent energy device, they have bright application prospects.
[0003] A fuel cell stack is made up of multiple single cells pressed together. Pressing ensures the contact resistance and sealing requirements between the single cells and is an important process in the formation of fuel cells.
[0004] In the prior art, when a fuel cell is press-assembled and fastened, end plates are installed on both sides of the core and fastened by bolts, tie rods, and binding bands to compress the core.
[0005] When the battery stack is placed horizontally, the friction between the core and the end plates caused by the tightening force ensures that the core does not collapse under the action of gravity. However, when there is a large acceleration perpendicular to the stacking direction of the cells that make up the core (common in testing and bumpy roads), the friction is not enough to provide the core and the end plates with the same acceleration. At this time, the core will shift, causing uneven gas distribution in the cells, affecting battery performance, and even causing severe phenomena such as emergency stop and stack burning. Utility Model Content
[0006] The purpose of the utility model is to provide a fuel cell stack and a fuel cell to solve the problem in the prior art that when there is a large acceleration perpendicular to the direction of the core, the friction between the core and the end plate is insufficient to provide the core with the same acceleration as the end plate, resulting in the core offset and collapse.
[0007] In order to solve the above problems, the utility model relates to a battery stack, comprising:
[0008] Core;
[0009] Support members, at least one, are arranged inside the core to separate the core
[0010] into at least two core segments;
[0011] There are two end plates, which are installed at both ends of the core;
[0012] Tie rods, used to connect the two end plates so that the core segments are in pressure contact with the end plates and / or the support members respectively;
[0013] The support member is connected with the pull rod.
[0014] In some specific embodiments, the support member is in the shape of a plate, and the surface of the support member is perpendicular to the stacking direction of the single cells constituting the core.
[0015] In some specific embodiments, through holes are respectively provided at opposite ends of the support member or notches are respectively provided at opposite ends of the support member, so that the flow guides of the core segments located on both sides of the support member are connected to each other.
[0016] In some specific embodiments, it also includes:
[0017] There are at least two limiting members; at least one is installed at one end of the supporting member, and at least one is installed at the other end of the supporting member; the limiting members at both ends are respectively connected to the pull rods.
[0018] In some specific embodiments, the limiting member is detachably connected to the supporting member;
[0019] And / or, the limiting member is made of insulating material.
[0020] In some specific embodiments, the limiting member has an embedding groove, the end of the supporting member is embedded in the embedding groove, and the supporting member and the inner wall of the embedding groove are clearance-matched; the limiting member and the pull rod are connected through a fixing member or through a limiting structure.
[0021] In some of the specific embodiments, the support member is made of a conductive material;
[0022] Alternatively, the support member is made of insulating material, and a conductive wire is installed on the support member.
[0023] In some specific embodiments, the end plate comprises:
[0024] The gas port end plate is installed at one end of the core;
[0025] Blind end plate, installed at the other end of the core;
[0026] One end of the pull rod is connected to the air port end plate, the other end is connected to the blind end plate, and the middle part is connected to the support member.
[0027] In some specific embodiments, it also includes:
[0028] A first current collecting plate, arranged between the gas inlet end plate and the core;
[0029] The second current collecting plate is arranged between the blind end plate and the core.
[0030] A fuel cell based on the same inventive concept includes the fuel cell stack provided by any of the above specific embodiments.
[0031] The beneficial effects of the utility model are as follows:
[0032] 1. Add a support member in the middle of the core. The support member penetrates the core in a direction perpendicular to the stacking direction of the single cells, and divides the core into several electrically connected sections. Each section of the core is pressed between the gas port end plate and the support member, or between the blind end plate and the support member, or between two support members. The support member is connected to the tie rod to limit the movement of the support member in the direction perpendicular to the stacking direction of the single cells, so that the friction between the core and the end plate and the support member can meet the acceleration requirements of the heavy core, and the core is not prone to collapse.
[0033] 2. By adding core fixing points (support parts) inside the core, the cantilever beam structure of the core is further shortened, which is beneficial to increase the resonant frequency of the core, reduce core resonance, and is beneficial to the strength design of components such as the shell.
[0034] 3. The use of connecting beams is reduced in the height direction, which can reduce space waste.
[0035] 4. When a single battery fails, especially when the battery at the bottom fails, there is no need to disassemble and reassemble all the batteries. Just remove the part that does not contain the faulty battery and then disassemble and reassemble. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0037] Figure 1 It is a schematic diagram of the structure of a fuel cell stack in the prior art.
[0038] Figure 2 It is a schematic diagram of the overall structure of the utility model.
[0039] Figure 3 A schematic diagram of the structure of the support member.
[0040] Figure 4 It is a schematic diagram of the structure of the limiter.
[0041] Figure 5 This is the assembly drawing of the support and limit parts.
[0042] Explanation of the reference numerals in the figure: 1-core, 101-guide channel, 2-support member, 201-first through hole, 202-second through hole, 203-third through hole, 204-connecting ear plate, 3-limiting member, 301-embedded groove, 4-end plate, 401-gas port end plate, 402-blind end plate, 5-pull rod, 601-first current collecting plate, 602-second current collecting plate. DETAILED DESCRIPTION
[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0044] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0045] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axis", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or 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 a limitation on the present invention.
[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0047] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "join", "hinge" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0048] like Figure 1 In the background technology, after the electric propulsion completes the stacking, the bolts on the end plate are tightened, and the friction between the core and the end plate is relied on to ensure that the core does not deviate. However, the core of the current high-power fuel cell is often long and heavy. When the acceleration is large, the friction cannot ensure that the core has the same acceleration as the end plate, so the collapse is inevitable.
[0049] In order to improve the above problems, this embodiment provides a battery stack, such as Figure 2As shown, the core 1, support member 2, end plate 4 and tie rod 5 are included, wherein there is at least one support member 2, which is arranged inside the core 1 to separate the core 1 into at least two core segments. There are two end plates 4, which are respectively arranged at both ends of the core 1. The tie rod 5 is arranged between the two end plates 4, and is used to connect the two end plates 4, and is used to tighten the two end plates 4 to each other in the length direction of the core, so that the core segments are kept in pressure contact with the end plates 4 or the support member 2.
[0050] Among them, the support member 2 is also connected to the pull rod 5, and the pull rod 5 plays a limiting role on the support member 2, so that the support member 2 can support the core segment. When the acceleration is large, the friction between the support member 2 and the core segment can ensure that the core segment has the same acceleration as the end plate 4, preventing the core 1 from collapsing.
[0051] Regarding the position and number of the support members 2, the support members 2 can be arranged at different positions of the core 1 according to the length and mass of the core 1. Figure 2 As shown, a support member 2 is arranged in the middle of the core 1, and the support member 2 divides the core 1 into two left and right core segments. The core segments located on both sides of the support member 2 maintain pressure contact with the support member 2 or the end plate 4 respectively.
[0052] Specifically, in the exemplary embodiment, the support member 2 is plate-shaped to maximize the contact area between the support member 2 and the core 1. The surface of the support member 2 is perpendicular to the stacking direction of the cells constituting the core 1 to limit the movement of the support member 2 in the direction perpendicular to the stacking direction of the cells, so that the friction between the core 1 and the support member 2 can meet the acceleration requirements of the heavy core 1, and the core is not prone to collapse.
[0053] The plate-shaped support member 2 penetrates the core 1 from the inside, and divides the core 1 into a plurality of core segments, and the core segments located on both sides of the support member 2 are respectively in pressure contact with the support member 2. In this embodiment, the outer contour of the support member 2 is consistent with the cross-sectional contour of the core 1 along the direction perpendicular to the stacking direction of the single cells, so as to facilitate the installation of the tie rod 5.
[0054] Specifically, in the exemplary embodiment, the first through hole 201 and / or the second through hole 202 and / or the third through hole 203 are respectively provided at the opposite ends of the support member 2, and the positions of the first through hole, the second through hole and the third through hole respectively correspond to the corresponding flow guide 101 on the core, and the first through hole 201, the second through hole 202 and the third through hole 203 respectively keep consistent with the cross-sectional shape of the corresponding flow guide 101 on the core, so that the flow guide 101 of each section of the core 1 is respectively connected with the first through hole and / or the second through hole and / or the third through hole. Among them, the flow guide 101 of the core includes a hydrogen flow guide, an air flow guide and a cooling water flow guide. In this embodiment, the first through hole 201 is connected to the hydrogen flow guide, the second through hole 202 is connected to the air flow guide, and the third through hole 203 is connected to the core cooling water flow guide.
[0055] As an optional implementation, notches may be provided at opposite ends of the support member, the positions of the notches corresponding to the positions of the corresponding flow channels 101 on the core, so that the support member avoids the hydrogen, air, and cooling water flow channels of the core, and the flow channels of each core segment are interconnected.
[0056] Specifically, in the demonstration example, a battery stack of the utility model also includes: more than two limit members 3, wherein at least one limit member 3 is installed at one end of the support member 2, and at least one limit member 3 is installed at the other end of the support member 2, and the limit members 3 at both ends are respectively connected to the pull rod 5.
[0057] The limit member 3 is detachably connected to the support member 2, and the support member 2 is limit-connected to the pull rod 5 through the limit member 3. While supporting the support member 2, the limit member 3 can also limit the movement of the support member 2 along the direction vertical to the stacking of single cells. When the core 1 shakes, it ensures that the support member 2 does not shake with the core 1.
[0058] Specifically, in this embodiment, the left and right sides of the support member 2 respectively have connecting ear plates 204, the connecting ear plates 204 protrude from the core 1, the limiting member 3 is installed on the connecting ear plates 204, the limiting member 3 has a groove 301, the connecting ear plates 204 are nested in the groove 301 of the limiting member 3, and the connecting ear plates 204 and the inner wall of the groove 301 are gap-matched.
[0059] The other end of the limit member 3 can be connected to the pull rod through a fixing member. For example, the limit member 3 can be connected to the pull rod by a fixing bolt, and the end of the fixing bolt passes through the pull rod and presses on the end of the limit member 3 to limit the movement of the support member 2 along the vertical single battery stacking direction.
[0060] As an optional implementation, the other end of the limit member 3 can also be connected to the pull rod through a limiting structure. For example, a limiting boss or a limiting groove can be provided on the pull rod, and a limiting groove or a limiting boss can be provided at a corresponding position of the limit member 3. By clamping the limit member 3 on the limiting boss or limiting groove on one or more pull rods, the limit member 3 is connected to the pull rod 5 to limit the movement of the support member 2 along the vertical single battery stacking direction.
[0061] Taking insulation into consideration, in this embodiment, the limiting member 3 is made of insulating material so that the supporting member 2 and the pull rod 5 are insulated from each other.
[0062] Preferably, in the exemplary embodiment, the support member 2 is made of a conductive material, or a metal conductive layer is coated on the surface of the support member 2, so that the support member 2 itself serves as a conductive medium to electrically connect two adjacent sections of the core 1 to each other.
[0063] As an optional implementation, the support member 2 itself may not serve as a conductive medium, and a conductive structure such as a conductive metal wire or a conductive terminal may be provided on the support member 2 to achieve electrical connection between two adjacent sections of the core 1 .
[0064] As an optional implementation, a conductive wire may be installed on the support member 2, and two adjacent sections of the core 1 are electrically connected through the conductive wire.
[0065] Preferably, in the exemplary embodiment, the end plate 4 includes a gas port end plate 401 and a blind end plate 402, wherein the gas port end plate 401 is mounted at one end of the core 1, and the blind end plate 402 is mounted at the other end of the core 1. One end of the tie rod 5 is connected to the gas port end plate 401, the other end of the tie rod 5 is connected to the blind end plate 402, and the middle of the tie rod is connected to the support member 2. By connecting the support member 2 to the tie rod 5, the movement of the support member 2 in the vertical direction of the single cell stacking is restricted.
[0066] In other embodiments, a shell (not shown) may be further included, in which the core 1, the support member 2, the gas port end plate 401, the blind end plate 402 and the tie rods are all wrapped. The stopper 3 is staggered with the tie rods so that the stopper 3 passes through between the tie rods and is limited inside the shell.
[0067] Preferably, in the exemplary embodiment, a first current collecting plate 601 and a second current collecting plate 602 are further included, wherein the first current collecting plate 601 is disposed between the gas inlet end plate 401 and the core 1, and the core 1 and the gas inlet end plate 401 are electrically connected via the first current collecting plate 601. The second current collecting plate 602 is disposed between the blind end plate 402 and the core 1, and the core 1 and the blind end plate 402 are electrically connected via the second current collecting plate 602.
[0068] The following describes a fuel cell stack and a fuel cell of the present application in combination with the principles.
[0069] According to μf=ma, since the press force F is often determined when selecting the membrane electrode and the rubber strip, and the friction coefficient μ is an inherent property between materials and cannot be changed, in order to make the core 1 have the same acceleration as the end plate 4, the above equation can only be guaranteed by adjusting m.
[0070] In this embodiment, after the support member 2 is added to the middle of the core 1, the friction force acting on half of the core is the same as the friction force acting on the entire core, but the mass of the corresponding core is half of the original. Therefore, the same friction force can ensure that each core segment has a greater acceleration, so that when there is a large acceleration in the single cell stacking direction perpendicular to the core 1, each core segment is also sufficient to have the same acceleration as the end plate 4 and the support member 2, effectively preventing the core 1 from deflecting and collapsing.
[0071] In other embodiments, the support member 2 may be provided with a resistance increasing structure for increasing the friction between the support member 2 and the core 1. The resistance increasing structure may be concave-convex points or concave-convex patterns provided on the surface of the support member 2 to increase the roughness of the surface of the support member 2, thereby increasing the friction between the support member 2 and the core 1, so that the core 1 of the same length and mass is not prone to collapse when subjected to a large acceleration.
[0072] This embodiment also provides a fuel cell, including the fuel cell stack provided by any of the above specific embodiments.
[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "a specific embodiment" 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. In this specification, the schematic representation of terms does 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.
[0074] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present invention based on the technical solution and the concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A battery stack, characterized in that: include: Core; A support member, at least one, is disposed inside the core to separate the core into at least two core segments; two end plates, arranged at both ends of the core; A tie rod, used to connect the two end plates so that the core segment maintains pressure contact with the end plates and / or the support member respectively; The support member is connected to the pull rod.
2. The battery stack according to claim 1, characterized in that: The support member is in a plate shape, and the surface where the support member is located is perpendicular to the stacking direction of the single cells constituting the core.
3. The battery stack according to claim 1, characterized in that: Through holes are respectively provided at opposite ends of the support member or notches are respectively provided at opposite ends of the support member, so that the flow guides of the core segments located on both sides of the support member are connected respectively.
4. The fuel cell stack according to any one of claims 1 to 3, characterized in that: Also includes: Limiting members, at least two; at least one is mounted on one end of the support member, and at least one is mounted on the other end of the support member; The limiting members at both ends are respectively connected to the pull rods.
5. The battery stack according to claim 4, characterized in that: The limiting member is detachably connected to the supporting member; And / or, the limiting member is made of insulating material.
6. The battery stack according to claim 5, characterized in that: The limiting member has an embedding groove, the end of the supporting member is embedded in the embedding groove, and the supporting member is clearance-matched with the inner wall of the embedding groove; the limiting member is connected to the pull rod via a fixing member or a limiting structure.
7. The fuel cell stack according to any one of claims 1 to 3, characterized in that: The support member is made of conductive material; Alternatively, the support member is made of insulating material, and a conductive wire is installed on the support member.
8. The fuel cell stack according to any one of claims 1 to 3, characterized in that: The end plate comprises: A gas port end plate, mounted at one end of the core; a blind end plate, mounted at the other end of the core; One end of the pull rod is connected to the air port end plate, the other end is connected to the blind end plate, and the middle part is connected to the support member.
9. The battery stack according to claim 8, characterized in that: Also includes: A first current collecting plate, disposed between the gas port end plate and the core; The second current collecting plate is arranged between the blind end plate and the core.
10. A fuel cell, characterized in that: A fuel cell stack comprising any one of claims 1 to 9.