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Fuel cell stack structure

A fuel cell stack and unit cell technology, which is applied to fuel cells, circuits, electrical components, etc., can solve the problems of uniform temperature distribution, current density deterioration, etc., and achieve the effect of maintaining current density and promoting temperature distribution.

Active Publication Date: 2020-02-18
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the problem with the fuel cell stack structure in the prior art is that the thickness of the stack is increased due to the additional heat sink that can exhibit a cooling effect in the stack, especially the fuel cell stack structure in the prior art. The problem is: current density degradation compared to other fuel cell stack structures with the same height
[0007] In addition, there is a problem with the fuel cell stack structure in the prior art that there is a limitation in making the temperature distribution uniform in the fuel cell stack structure due to the limitation in the types of radiators that can be provided in the stack.

Method used

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Examples

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manufacture example

[0086] In the 40-cell stack structure in which 40 unit cells are stacked, the second window frame is provided whenever five unit cells are stacked. The thickness of the first sash and the second sash is in the range of 5mm to 10mm, the size of the first sash and the second sash is in the range of 150mm to 200mm, and in this case, the The dimensions are 5 mm or more greater than the dimensions of the interconnect and the first sash.

experiment example 1

[0090] Measurement of in-plane distribution of fuel cell stack structures

[0091] refer to Figure 5 , Figure 5 (a) shows the in-plane temperature distribution measured based on 5 unit cells in the fuel cell stack structure of the comparative example not including the second window frame 32, Figure 5 (b) shows the in-plane temperature distribution measured based on 40 unit cells in the fuel cell stack structure of the manufacturing example.

[0092] In the comparative example, the in-plane temperature distribution was measured based on 5 unit cells, the highest temperature was measured at 673°C, the lowest temperature was measured at 634°C, and the measured temperature deviation was about 40°C, while in the manufacturing example, based on 40 The in-plane temperature distribution of the unit cell was measured, the highest temperature was 684°C, the lowest temperature was 662°C, and the measured temperature deviation was 20°C.

[0093] That is, it can be seen that even in ...

experiment example 2

[0095] Measurement of temperature distribution of fuel cell stack structures

[0096] refer to Image 6 , Image 6 (a) shows the measured temperature distribution of a comparative example which does not include the second window frame and has a 40-cell stack structure in which 40 unit cells are stacked, Image 6 (b) shows the measured temperature distribution of a manufacturing example having a 40-cell stack structure in which 40 unit cells are stacked and a second window frame is provided every time five unit cells are stacked.

[0097] In the fuel cell stack structure of the comparative example, a large temperature deviation occurs between the central portion and the peripheral portion at an operating temperature of 650°C, and the temperature measured at the central portion is about 720°C because the temperature at the central portion is relatively It was higher than the temperature at the peripheral portion, and the temperature measured at the peripheral portion was about...

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Abstract

The present invention relates to a fuel cell stack structure and, more specifically, to a fuel cell stack structure having unit cells stacked therein, wherein second window frames lager in area than first window frames are arranged at regularly periodical intervals in the unit cell stacking direction, thereby promoting the movement of heat to make a low temperature deviation and a uniform temperature distribution across the fuel cell stack structure.

Description

technical field [0001] This application claims priority and benefit from Korean Patent Application No. 10-2017-0094709 filed with the Korean Intellectual Property Office on July 26, 2017, the entire contents of which are incorporated herein by reference. [0002] The present invention relates to a fuel cell stack structure, and more particularly, to a fuel cell stack structure in which unit cells are stacked, and units each having an area larger than that of the first cell are periodically arranged at predetermined intervals in the direction in which the unit cells are stacked. A second window frame of the area of ​​the window frame facilitates thermal movement, mitigates temperature deviations in the fuel cell stack structure, and makes temperature distribution uniform. Background technique [0003] Recently, as existing energy sources such as oil or coal are consumed, interest in alternative energy sources that can replace existing energy sources has increased. The unit c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/2432H01M8/0273H01M8/124
CPCH01M8/0273H01M8/242H01M8/04067Y02E60/50H01M8/2432H01M2008/1293H01M8/2475H01M8/248
Inventor 卢泰敏金材星任上赫朴珖渊林艺勋崔光郁崔峻源
Owner LG CHEM LTD