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Fastening method and fastening device for fuel cell stack, and fuel cell

A technology for fuel cell stacks and fastening devices, which can be applied to fuel cells, circuits, electrical components, etc., and can solve the problems of large tension tolerance of cable ties, uneven pressure distribution, and sacrifice of stack power density.

Active Publication Date: 2021-02-02
浙江海晫新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of this method still exist: First, even if the torque of tightening the bolts is controlled, due to the difference between the bolts, the tension tolerance on the cable tie is relatively large, resulting in uneven pressure distribution of the end plate on the internal components of the battery stack. ; In order to obtain a uniform internal pressure of the battery stack, the thickness and strength of the end plate can only be increased, sacrificing the power density of the stack
Third, even if the width of the cable tie is much larger than the diameter of the bolt, the position where the cable tie is fixed by the bolt is still the weak link in the fastening strength of the cable tie

Method used

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  • Fastening method and fastening device for fuel cell stack, and fuel cell
  • Fastening method and fastening device for fuel cell stack, and fuel cell
  • Fastening method and fastening device for fuel cell stack, and fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: see figure 1 and figure 2 As shown, a fuel cell includes a fuel cell stack 10, and the fuel cell stack 10 includes one or more single cells stacked together (the specific number is conventionally selected according to the design of the stack), wherein the single cell includes an anode plate, membrane electrode and cathode plate, the anode plate or cathode plate adopts silicon pole plate or graphite pole plate or metal pole plate or ceramic pole plate or composite material pole plate, and pole plates of other suitable materials can also be used. There is no specific limit.

[0040] The fastening method of the fuel cell stack 10 in this embodiment includes: applying pressure to the fuel cell stack 10 in advance and keeping the pressure before winding the strap unit 11; Unit 11 ( figure 2 6 ring-shaped cable tie units 11 are shown, and the specific number can be selected according to the axial length requirements of the stack 10 and the internal pressure di...

Embodiment 2

[0047] Embodiment 2: The remaining technical solutions of this embodiment 2 are the same as those of embodiment 1, the difference is that please refer to image 3 and Figure 4 As shown, in the second embodiment, there are six cable tie units 21 arranged in adjacent parallel intervals around the outer circumference of the fuel cell stack 20, wherein every two cable tie units 21 are arranged in adjacent parallel intervals A single connecting rod installation fastening group is formed, and a total of three connecting rod installation fastening groups are formed, wherein the first connecting rod 22, the second connecting rod 23, the third connecting rod 25 and the fourth connecting rod 26 each include three separate Segment connecting rod units, each segment connecting rod unit is fastened and installed and connected by fasteners 24;

[0048] Wherein, the first end portion 21a and the second end portion 21b of each strap unit 21 in the single connecting rod installation and fast...

Embodiment 3

[0049] Embodiment 3: the remaining technical solutions of this embodiment 3 are the same as embodiment 1 or embodiment 2, the difference is that please refer to Figure 5 As shown, the present embodiment 3 proposes an end plate 30a of a fuel cell stack 30, which is located at both ends of the fuel cell stack, and the outer periphery of the end plate 30a is provided with a cable tie unit 32 (see Image 6 , Figure 7 and Figure 8 ) the cable tie groove 31 with sliding limit fit to prevent the cable tie unit 32 from moving in its axial direction relative to the fuel cell stack 30; preferably, in this embodiment, the groove depth range of the cable tie groove 31 is 0.01-5mm; the groove width range of the cable tie groove 31 is 0.1-20mm, and the actual size specification of the cable tie groove 31 is specifically set according to the corresponding cable tie unit.

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Abstract

The invention discloses a fastening method and a fastening device for a fuel cell stack, and a fuel cell. According to the invention, at least two ribbon units are wound; and each ribbon unit at leastcomprises a first end part, a second end part, a third end part and a fourth end part, wherein the first end part and the second end part are respectively in limiting installation connection with a first connecting rod and a second connecting rod which are arranged in parallel at an interval, the third end part and the fourth end part are respectively in limiting installation connection with a third connecting rod and a fourth connecting rod which are arranged in parallel at an interval, the first connecting rod and the second connecting rod as well as the third connecting rod and the fourthconnecting rod are fastened, mounted and connected through fasteners respectively, and opposite fastening forces are applied to the first connecting rod and the second connecting rod, and transmittedto the ribbon unit until the fuel cell stack reaches a working pressure. According to the invention, the fuel cell stack is ensured to obtain a stress distribution effect required by better stack sealing and electrical properties; and meanwhile, more initiative and flexibility can be obtained in the processes of stack installation and life cycle maintenance of the stack.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fastening method for a fuel cell stack, and also relates to a fastening device for a fuel cell stack and a fuel cell used therefor. Background technique [0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy, also known as an electrochemical generator. Since the fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electrical energy through an electrochemical reaction, it is not limited by the Carnot cycle effect, and the energy conversion rate is high; and the reaction product of the fuel cell using hydrogen as fuel is Water, environmentally friendly, theoretically can achieve zero pollution emissions; in addition, the fuel cell has no mechanical transmission parts, less moving parts, and low noise during operation; moreover, the fuel cell also has high specific energy, high reliability, wide fuel...

Claims

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Application Information

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IPC IPC(8): H01M8/2475H01M8/247
CPCH01M8/247H01M8/2475Y02E60/50
Inventor 吴王聪秦臻朱景兵
Owner 浙江海晫新能源科技有限公司
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