Fuel cell stack end plate, assembly and cell
By incorporating elastic devices and tie rod structures on the endplates of the fuel cell stack, dual compensation for material tolerances and temperature variations is achieved, solving the problem of length changes during stack assembly and improving the stability and performance of the stack.
Patent Information
- Application Number
- CN202423086217.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-13
AI Technical Summary
Existing fuel cell stacks suffer from length variations due to material tolerances and temperature changes during assembly, making stable encapsulation difficult, especially in force-controlled mode where slotted tie rods cannot be effectively used.
The fuel cell stack end plates with elastic devices are used to achieve first-level compensation through the gasket or locking thread structure between the tie rod and the outer end plate. Combined with the disc spring or elastic device between the front and rear end plates, thermal expansion and contraction are achieved, thus achieving dual compensation. This solves specific problems that are difficult to solve in the existing technology and achieves dual compensation. Combined with the design of the figure, dual material and temperature changes are achieved, dual materials and products are achieved, and dual compensation of the fuel cell stack is realized.
It achieves effective compensation for material tolerances and temperature changes during batch assembly, ensuring the stability and consistency of the fuel cell stack, meeting the requirements of force control mode, and improving the performance and stability of the fuel cell stack.
Smart Images
Figure CN223638386U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to fuel cell technical field, specifically about a fuel cell stack end plate, subassembly and battery. BACKGROUND
[0002] Because fuel cell stack core is generally 10~1000 sections, involves 20~2000 parts quantity, length change is composed of two parts: one, polar plate, MEA and insulating plate and so on material cumulative tolerance, length change is generally 1~20mm;Two, the heat expansion and cold shrinkage of electric pile under zero 40 DEG C~100 DEG C temperature work, length change is generally 0.1~10mm, therefore electric pile total length change is generally 1.1~30mm. Electric pile packaging generally adopts the clamping groove type pull rod, and electric pile batch assembly generally adopts force control mode and control length size mode, wherein force control mode can better guarantee performance, but because force control mode is influenced by polar plate, MEA and insulating plate and so on material tolerance, clamping groove type pull rod cannot be used.
[0003] Therefore, aiming at the above technical problem, it is necessary to provide a fuel cell stack end plate, subassembly and battery.
[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms prior art that is publicly known. CONTENT OF UTILITY MODEL
[0005] The utility model aims at providing a fuel cell stack end plate, subassembly and battery, which can.
[0006] In order to achieve the above-mentioned purpose, the technical scheme provided by a specific embodiment of the utility model is as follows:
[0007] The fuel cell stack end plate with double compensation function comprises a front end plate assembly, a rear end plate assembly and a plurality of pull rods, the two ends of the pull rods are connected to the front end plate assembly and the rear end plate assembly respectively, the front end plate assembly comprises a front end plate, the rear end plate assembly comprises an inner end plate and a rear end plate, and characterized in that a plurality of elastic devices are arranged on at least any one of the opposite surfaces of the front end plate assembly and the rear end plate assembly and / or the opposite surfaces of the pull rods, the elastic devices are used for supporting the stack core structure elastically in the assembled state, and the stack core structure is limited in the space defined by the front end plate assembly and the rear end plate assembly.
[0008] In one or more embodiments of the utility model, the elastic device is selected from a spring (compression spring, which can be a leaf spring, a coil spring, a disc spring, etc.) or a rubber elastic piece (such as a rubber gasket, etc.).
[0009] In one or more embodiments of the utility model, one end of the pull rod is connected to the clamping groove of the front end plate in cooperation.
[0010] In one or more embodiments of the present application, the other end of the pull rod is cooperatively connected to the rear end plate through the compensation device, and the compensation device has the ability of size compensation in the extension direction of the pull rod.
[0011] In one or more embodiments of the present application, the compensation device comprises a locking threaded structure or a gasket structure.
[0012] When the locking threaded structure is adopted, the rear end plate and the inner end plate have through holes matched with the locking threaded structure, the clamping part at one end of the locking threaded structure is limited to the rear end plate, and the other end is threadedly connected to the locking hole on the pull rod.
[0013] When the gasket structure is adopted, the rear end plate has a fixing hole, the fixing plate at the end of the pull rod is connected to the fixing hole through a fastener, and the gasket structure is arranged between the fixing plate and the rear end plate.
[0014] In one or more embodiments of the present application, a limiting sink groove is arranged on the rear end plate, and the clamping part is limited in the limiting sink groove.
[0015] In one or more embodiments of the present application, an elastic device is arranged between the rear end plate and the inner end plate.
[0016] In one or more embodiments of the present application, the elastic device is a disc spring.
[0017] In one or more embodiments of the present application, the stack assembly comprises a fuel cell stack end plate with double compensation function and a stack core limited in the end plate.
[0018] In one or more embodiments of the present application, the battery comprises the stack assembly.
[0019] Compared with the prior art, the fuel cell stack end plate, the assembly and the battery of the present application have double compensation function, the gasket or the screw structure on the pull rod is adopted between the pull rod and the outer end plate, the length difference of the stack core caused by material tolerance is realized during the batch assembly of the stack, the length requirement of the pull rod in the force control mode is met, and one-time compensation is realized. In addition, the disc spring or the spring is arranged between the front end plate and the rear end plate, the length change requirement of the stack caused by thermal expansion and cold contraction due to temperature change is met, and two-time compensation is realized. The double compensation structure is adopted, the large range compensation requirement is met during the batch production of the stack, and the structure is stable, the volume is small, and the stack consistency is good. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0021] Figure 1 It is a schematic diagram of the electric pile structure in an embodiment of the present application.
[0022] Figure 2 It is a schematic diagram of the compensation state of the pull rod screw of the pile end plate in the combined state in an embodiment of the present application.
[0023] Figure 3 It is a partial enlarged view of Figure 2 .
[0024] Figure 4 It is a schematic diagram of the structure of the pull rod in an embodiment of the present application.
[0025] Figure 5 It is a schematic diagram of the disc spring arrangement of the inner end plate of the pile end plate in an embodiment of the present application.
[0026] Figure 6 It is a schematic diagram of the electric pile structure in another embodiment of the present application.
[0027] Figure 7 It is a partial enlarged view of Figure 6 .
[0028] Figure 8 It is a schematic diagram of the structure of the pull rod in an embodiment of the present application.
[0029] Figure 9 It is a schematic diagram of the structure of the gasket in an embodiment of the present application. DETAILED DESCRIPTION
[0030] In order to make the person skilled in the art better understand the technical solutions in the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.
[0031] The stack structure is mainly composed of a stack core 101, a front end plate assembly, a rear end plate assembly, and a pull rod 102. The stack core 101 is mainly composed of 10-1000 bipolar plates and MEAs. Since the stack core of the fuel cell stack generally has 10-1000 stacks, and involves 20-2000 parts, the length change is composed of two parts: 1. the cumulative tolerance of the materials such as the bipolar plate, the MEA, and the insulating plate, and the length change is generally 1-20 mm; 2. the thermal expansion and cold shrinkage of the stack under the working temperature of minus 40-100 DEG C, and the length change is generally 0.1-10 mm, so the total length change of the stack is generally 1.1-30 mm. The batch assembly of the stack generally adopts a force control mode and a length control mode, and the force control mode can better ensure the compression amount of the carbon paper of the MEA, thereby ensuring the performance of the stack.
[0032] As shown in Figures 1-5 , in the fuel cell stack end plate in the embodiment of the utility model, the front end plate assembly is composed of a front end plate 109, a distribution plate, an insulating plate, and a front copper collector plate; the rear end plate assembly is composed of an insulating plate 103, an inner end plate 104, a disc spring 105, a rear end plate 106, and a rear copper collector plate; and the pull rod 102 has 4-10 rods, and the number is determined according to the stacking specification of the stack core.
[0033] In the embodiment, the double compensation function can be: after the stack is pressed to the set force in the force control mode, one end of the pull rod 102 is clamped into the clamping groove of the front end plate 109, and is fixed on the front end plate 109 through a screw; the other end is screwed into the pull rod 102 through the screw 107 arranged on the rear end plate, thereby realizing the first compensation function during the stack assembly; the disc spring 105 can be arranged between the inner end plate 104 and the rear end plate 106, thereby realizing the second compensation requirement of thermal expansion and cold shrinkage of the stack under the working temperature of minus 40-100 DEG C.
[0034] Of course, the disc spring 105 can also be arranged between the inner end plate 104 and the stack core 101, thereby realizing the second compensation requirement of thermal expansion and cold shrinkage of the stack under the working temperature of minus 40-100 DEG C. As shown in Figure 2 and 3 , during the stack assembly in the embodiment, the force control mode is met, and after the stack is pressed to the set force, due to the thickness deviation of the 10-1000 stack materials, the lengths of the stacks are different, and a gap of 1-30 mm is left between the pull rod 102 and the rear end plate 106, so that the stack assembly in the force control mode is completed through the fastening screw 107, thereby realizing the first compensation. As shown in Figure 4 , the pull rod 102 is provided with fixing holes 102A, the number of which is 1-4; the number of the weight reduction process grooves 102B is not limited; and the pull rod 102 is provided with pull holes 102C, the number of which is 1-4. As shown in Figure 5As shown, the inner end plate 104 is uniformly provided with a disc spring limiting boss, a disc spring 105 is arranged on the disc spring limiting boss, the number of disc springs is 2-20 groups, the number of disc springs in each group is 1-10, adjacent disc springs are assembled in positive and negative directions, and the outermost disc spring bowl is outwardly open, and a spring can also be used instead.
[0035] Figures 6-9 Another embodiment of the fuel cell stack end plate with double compensation function of the utility model is different from the embodiment 1, the pull rod 202 is a clamping groove type, the gasket 206 with different thickness specifications is screened into the gap between the clamping groove of the pull rod 202 and the rear end plate 205, instead of the screw, the depth of the screw is tightened, and one-time compensation is realized. The stack core 201 is composed of 10-1000 polar plates and MEA; the front end plate assembly is composed of the front end plate 208, a distribution plate, an insulating plate and a front copper current collecting plate; the rear end plate assembly is composed of the insulating plate 203, the inner end plate 204, a disc spring, the rear end plate 205 and a rear copper current collecting plate 207; the electric pile is provided with the pull rod 202, the number of pull rods is 4-10, and the gasket 206 between the pull rod 202 and the rear end plate has a thickness of 0.1-10 mm.
[0036] Figure 8 As shown, the pull rod 202 can be provided with a fixing hole 202A, the number of fixing holes is 1-4; the pull rod fixing hole 202B, the number of fixing holes is 1-2; the pull rod fixing hole 202C, the number of fixing holes is 1-4; and the weight reduction process groove 202D, the number of grooves is unlimited. Figure 9 As shown, the gasket 206 has a thickness of 0.1-10 mm, and a fixing through hole 206A, the number of fixing holes is 1-2.
[0037] The disc spring in the embodiment shown above can be replaced by a high-temperature and low-temperature resistant rubber elastic member.
[0038] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.
[0039] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.
Claims
1. A fuel cell stack end plate with double compensation function, comprising a front end plate assembly, a rear end plate assembly, and a plurality of tie rods, the tie rods being connected to the front end plate assembly and the rear end plate assembly at both ends, the front end plate assembly comprising a front end plate, and the rear end plate assembly comprising an inner end plate and a rear end plate, characterized in that, At least any one of the opposite faces of the front end plate assembly, the opposite face of the rear end plate assembly and / or the opposite face of the tie rod is further provided with elastic means for elastically compensating the support to the core structure in the assembled state, the core structure being defined in the space jointly defined by the front end plate assembly and the rear end plate assembly.
2. The fuel cell stack end plate having a dual compensation function according to claim 1, characterized by, The elastic means are selected from springs or rubber elastic members.
3. The fuel cell stack end plate having a dual compensation function according to claim 1, characterized by, One end of the tie rod is cooperatively connected to the clamping slot of the front end plate.
4. The fuel cell stack end plate having a dual compensation function according to claim 3, characterized by The other end of the tie rod is cooperatively connected to the rear end plate through the compensation means, the compensation means having the capability of size compensation in the extension direction of the tie rod.
5. The fuel cell stack end plate with dual compensation function according to claim 4, characterized by, The compensation means comprises a locking screw structure or a gasket structure. When the locking screw structure is adopted, the rear end plate and the inner end plate have through holes matching the locking screw structure, the clamping part of one end of the locking screw structure being defined to the rear end plate and the other end being threadedly connected to the locking screw hole on the tie rod; When the gasket structure is adopted, the rear end plate has a fixing hole, the fixing plate at the end of the tie rod being connected to the fixing hole through a fastener, the gasket structure being arranged between the fixing plate and the rear end plate.
6. The fuel cell stack end plate with dual compensation function according to claim 5, characterized by The rear end plate is provided with a limiting sink, the clamping part being defined in the limiting sink.
7. The fuel cell stack end plate having a dual compensation function according to claim 1, characterized by, The elastic means are arranged between the rear end plate and the inner end plate.
8. The fuel cell stack end plate having a dual compensation function according to claim 2, characterized by, The elastic means are disc springs.
9. A stack assembly comprising the fuel cell stack end plate with double compensation function according to any one of claims 1-8 and a core structure limited in the end plate.
10. A battery comprising the stack assembly according to claim 9.