CN109473693A - A kind of fuel battery metal double polar plate - Google Patents
A kind of fuel battery metal double polar plate Download PDFInfo
- Publication number
- CN109473693A CN109473693A CN201811611569.6A CN201811611569A CN109473693A CN 109473693 A CN109473693 A CN 109473693A CN 201811611569 A CN201811611569 A CN 201811611569A CN 109473693 A CN109473693 A CN 109473693A
- Authority
- CN
- China
- Prior art keywords
- plate
- unipolar plate
- gas
- unipolar
- fuel battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 38
- 239000002184 metal Substances 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 238000003466 welding Methods 0.000 claims abstract description 30
- 239000002826 coolant Substances 0.000 claims abstract description 29
- 239000003292 glue Substances 0.000 claims abstract description 5
- 239000000565 sealant Substances 0.000 claims description 4
- 230000005404 monopole Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 30
- 239000012528 membrane Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000036647 reaction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention discloses a kind of fuel battery metal double polar plates, it includes the first unipolar plate and the second unipolar plate, the front and back sides edge of first unipolar plate is respectively equipped with the first solder-bump and the first welding groove, the front and back sides edge of second unipolar plate is respectively equipped with the second solder-bump and the second welding groove, first solder-bump is connected at the second solder-bump by laser welding, the filling glue for completely cutting off gas is equipped in first welding groove and the second welding groove, coolant liquid inlet and outlet are formed between the reverse side of first unipolar plate and the reverse side of the second unipolar plate, coolant liquid flow field and gas inlet and outlet, the front of first unipolar plate and the front of the second unipolar plate are equipped with gas flowfield and gas manhole appendix, gas manhole appendix is connected to gas inlet and outlet.Fuel battery metal double polar plate structure of the invention is simple, and securely and reliably, leakproofness is strong.
Description
Technical field
The present invention relates to Proton Exchange Membrane Fuel Cells field, in particular to a kind of fuel battery metal double polar plate.
Background technique
Fuel cell is the device that the chemical energy of Oxidizing and Reducing Agents is directly changed into electric energy by electrocatalytic reaction,
It is a kind of efficient, safe and clean, flexible new-generation technology.Proton Exchange Membrane Fuel Cells therein is because it is with efficiency
It is high, energy density is big, reaction temperature is low, the remarkable advantages such as noiseless, pollution-free and at terrestrial power generation station, electric vehicle and portable
Power supply etc. is with a wide range of applications.Fuel battery inside is mainly by proton exchange membrane, electro chemical catalyst, expansion
Dissipate layer and bipolar plates composition.When the fuel cell is operating, internal that following reaction process occur: reaction gas expands in diffusion layer
It dissipates, when reaction gas reaches Catalytic Layer, by Catalyst Adsorption and electrocatalytic reaction occurs in Catalytic Layer；Anode reaction generates
Proton by being transmitted to cathode side in proton exchange membrane, electronics reaches cathode through external circuit, with oxygen molecule reaction bonded Cheng Shui,
Heat is released simultaneously.Electrode reaction are as follows:
Anode (cathode): H2 → 2H++2e
Cathode (anode): 1/2O2+2H++2e → H2O
Cell reaction: H2+1/2O2 → H2O
In one typical Proton Exchange Membrane Fuel Cells, membrane electrode is placed among two pieces of conductive guide plates, and two pieces
Deflector is the deflector of anode fuel and the deflector of cathode oxidant respectively.The fuel cell formed in this way is known as single
Battery, in order to increase the general power of entire Proton Exchange Membrane Fuel Cells, need by multiple monocells directly fold by way of string
It is unified into battery pack, is called fuel cell pile.In fuel cell pile, the two sides of one piece of pole plate can have diversion trench,
The middle anode guide face that can be used as a membrane electrode on one side, cathode diversion of the another side but also as another adjacent membrane electrode
Face, this pole plate are called bipolar plates.Pile is tightened together by front end-plate, end plate and pull rod.Current metal double polar plates
Have the following problems mostly: structure is complicated, and assembly efficiency is low, poor sealing effect.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of that present invention to provide a kind of safe and reliable, the strong fuel cells of leakproofness
Metal double polar plates adopt the following technical scheme that
A kind of fuel battery metal double polar plate comprising the first unipolar plate and the second unipolar plate, first unipolar plate
Front and back sides edge is respectively equipped with the first solder-bump and the first welding groove, and the front and back sides edge of second unipolar plate is set respectively
There are the second solder-bump and the second welding groove, passes through Laser Welding in succession at first solder-bump and the second solder-bump
It connects, the filling glue for completely cutting off gas, first unipolar plate is equipped in the first welding groove and the second welding groove
Reverse side and the second unipolar plate reverse side between form coolant liquid inlet and outlet, coolant liquid flow field and gas inlet and outlet, described first
The front of unipolar plate and the front of the second unipolar plate are equipped with gas flowfield and gas manhole appendix, the gas manhole appendix and gas
Inlet and outlet connection.
As a further improvement of the present invention, first unipolar plate is identical with the second unipolar plate structure.
As a further improvement of the present invention, the front of first unipolar plate is equipped with several flow field supporting ribs, the stream
Field supporting rib extends to the other end from one end of first unipolar plate.
As a further improvement of the present invention, the both ends of first unipolar plate are additionally provided with gas flow-disturbing protrusion, the gas
Body flow-disturbing protrusion is set to the opening of adjacent two flow field supporting rib.
As a further improvement of the present invention, spaced set between the flow field supporting rib.
As a further improvement of the present invention, the reverse side of first unipolar plate is equipped with coolant liquid flow field support protrusion.
As a further improvement of the present invention, the both sides of the edge of first unipolar plate are equipped with coolant liquid supporting point, institute
It states the coolant liquid supporting point in the first unipolar plate and the second unipolar plate and cooperatively forms coolant liquid inlet and outlet.
As a further improvement of the present invention, the front of first unipolar plate and the second unipolar plate is equipped with sealant.
Beneficial effects of the present invention:
The first weldering is respectively set by the front and back sides edge in the first unipolar plate in fuel battery metal double polar plate of the invention
Protrusion and the first welding groove are connect, the second solder-bump is respectively set at the front and back sides edge of the second unipolar plate and the second welding is recessed
It is connected at slot, the first solder-bump and the second solder-bump by laser welding, in the first welding groove and the second welding groove
It is equipped with the filling glue for completely cutting off gas.Fuel battery metal double polar plate structure of the invention is simple, securely and reliably, leakproofness
By force.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and attached drawing is matched, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the first unipolar plate and the second unipolar plate in the embodiment of the present invention；
Fig. 2 is the assembling schematic diagram one of fuel battery metal double polar plate in the embodiment of the present invention；
Fig. 3 is the assembling schematic diagram two of fuel battery metal double polar plate in the embodiment of the present invention；
Fig. 4 is the schematic diagram of internal structure of fuel battery metal double polar plate in the embodiment of the present invention；
Fig. 5 is the enlarged diagram in Fig. 4 at A；
Fig. 6 is that coolant liquid flows to schematic diagram in fuel battery metal double polar plate in the embodiment of the present invention；
Fig. 7 is gas flow schematic diagram in fuel battery metal double polar plate in the embodiment of the present invention.
Description of symbols: 100, the first unipolar plate；110, the first welding groove；120, the first solder-bump；130, two sides are opened
Mouthful；131, coolant liquid is imported and exported；132, coolant liquid supporting point；133, coolant liquid flow field support protrusion；140, both ends open；141,
Gas inlet and outlet；142, air supporting point；143, gas manhole appendix；150, gas flowfield；151, flow field supporting rib；152, gas
Flow-disturbing protrusion；160, sealant；200, the second unipolar plate.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
It as shown in figs. 1-7, is the fuel battery metal double polar plate in the present embodiment, which includes
First unipolar plate 100 and the second unipolar plate 200, the bipolar plates by the first unipolar plate 100 and the second unipolar plate 200 fitting welding and
At in the present embodiment, the first unipolar plate 100 is identical with 200 structure of the second unipolar plate, only needs a secondary mold that can make.
The front and back sides edge of first unipolar plate 100 is respectively equipped with the first solder-bump 120 and the first welding groove 110, the
One solder-bump 120 is by punch forming, its reverse side forms the first welding groove 110 after the molding of the first solder-bump 120.Together
Sample, the front and back sides edge of the second unipolar plate is respectively equipped with the second solder-bump and the second welding groove, the first solder-bump 120
It is connected at the second solder-bump by laser welding.Specifically, being welded out of first welding groove 110 to first using laser
The contact surface of protrusion 120 and the second solder-bump carries out laser welding.It is all provided in first welding groove 110 and the second welding groove
There is the filling glue for completely cutting off gas.
The two sides of first unipolar plate 100 and the second unipolar plate 200 are equipped with both-side opening 130, the first unipolar plate 100 it is anti-
The coolant liquid inlet and outlet 131 being connected to both-side opening 130 are formed between face and the reverse side of the second unipolar plate 200.Preferably, first
The reverse side both sides of the edge of unipolar plate 100 and the second unipolar plate 200 are equipped with coolant liquid supporting point 132, the first unipolar plate 100 and
Coolant liquid supporting point 132 in two unipolar plates 200 cooperatively forms coolant liquid inlet and outlet 131.First unipolar plate 100 and the second monopole
Form coolant liquid flow field between the coolant liquid inlet and outlet 131 of 200 two sides of plate, the first unipolar plate 100 and the second unipolar plate 200 it is anti-
Face is equipped with coolant liquid flow field support protrusion.
As shown in fig. 6, arrow direction is that coolant liquid flows in fuel battery metal double polar plate in the present embodiment in figure.It will be cold
But for 131 design of liquid inlet and outlet in bipolar plates two sides, coolant liquid 131 dimensioned areas of inlet and outlet are larger, ensure that fluid flow, radiate
Effect is more preferable.
The front of first unipolar plate 100 and the second unipolar plate 200 is equipped with sealant 160, for completely cutting off coolant liquid.
The both ends of first unipolar plate 100 and the second unipolar plate 200 are equipped with both ends open 140, the first unipolar plate 100 it is anti-
The gas inlet and outlet 141 being connected to both ends open 140, the first unipolar plate 100 are formed between face and the reverse side of the second unipolar plate 200
Front and the front of the second unipolar plate 200 be equipped with gas flowfield 150 and gas manhole appendix 143, gas manhole appendix 143 and gas
141 connection of body inlet and outlet.Gas inlet and outlet 141 since without the concern for coolant liquid engaged position, size can be increased accordingly,
Corresponding fluid flow increases, and ensure that the gas demand of more high-power grade.
The front of first unipolar plate 100 and the second unipolar plate 200 is equipped with several flow field supporting ribs 151, flow field supporting rib
151 extend to the other end from one end of bipolar plates.The positive both ends of first unipolar plate 100 and the second unipolar plate 200 are additionally provided with gas
Body flow-disturbing protrusion 152, gas flow-disturbing protrusion 152 are set to the opening of adjacent two flow field supporting rib 151.Preferably, flow field supports
Spaced set between muscle 151.Gas flow-disturbing protrusion 152 can allow the gas more disorder of entrance, improve the equal of gas distribution
Even property.
As shown in fig. 7, arrow direction is gas flow in fuel battery metal double polar plate in the present embodiment in figure, a table is schemed
Show the positive gas flow of the first unipolar plate 100, figure b indicates the positive gas flow of the second unipolar plate 200, the first unipolar plate
100 and 200 upward arrow of the second unipolar plate respectively indicate oxygen and hydrogen flow direction.
The first solder-bump is arranged by the opposite longitudinal side edge in the first unipolar plate in fuel battery metal double polar plate of the invention,
In the opposite longitudinal side edge of the second unipolar plate, the second solder-bump contacted with the first solder-bump, the first solder-bump and second are set
It is formed between solder-bump and welds groove, the reverse side of the reverse side of the first unipolar plate and the second unipolar plate passes through welding groove welding
Connection.Fuel battery metal double polar plate structure of the invention is simple, and securely and reliably, leakproofness is strong.
Above embodiments are only to absolutely prove preferred embodiment that is of the invention and being lifted, and protection scope of the present invention is not
It is limited to this.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in guarantor of the invention
Within the scope of shield.Protection scope of the present invention is subject to claims.
Claims (8)
1. a kind of fuel battery metal double polar plate, it is characterised in that: including the first unipolar plate and the second unipolar plate, described first is single
The front and back sides edge of pole plate is respectively equipped with the first solder-bump and the first welding groove, the front and back sides edge of second unipolar plate
It is respectively equipped with the second solder-bump and the second welding groove, passes through Laser Welding at first solder-bump and the second solder-bump
It connects in succession, the filling glue for completely cutting off gas is equipped in the first welding groove and the second welding groove, described first is single
Coolant liquid inlet and outlet, coolant liquid flow field and gas inlet and outlet are formed between the reverse side of pole plate and the reverse side of the second unipolar plate, it is described
The front of first unipolar plate and the front of the second unipolar plate are equipped with gas flowfield and gas manhole appendix, the gas manhole appendix with
Gas inlet and outlet connection.
2. fuel battery metal double polar plate as described in claim 1, which is characterized in that first unipolar plate and the second monopole
Hardened structure is identical.
3. fuel battery metal double polar plate as claimed in claim 2, which is characterized in that the front of first unipolar plate is equipped with
Several flow field supporting ribs, the flow field supporting rib extend to the other end from one end of first unipolar plate.
4. fuel battery metal double polar plate as claimed in claim 3, which is characterized in that the both ends of first unipolar plate are also set
There is gas flow-disturbing raised, the gas flow-disturbing protrusion is set to the opening of adjacent two flow field supporting rib.
5. fuel battery metal double polar plate as claimed in claim 3, which is characterized in that equidistant between the flow field supporting rib
Setting.
6. fuel battery metal double polar plate as claimed in claim 2, which is characterized in that the reverse side of first unipolar plate is equipped with
Coolant liquid flow field support protrusion.
7. fuel battery metal double polar plate as claimed in claim 2, which is characterized in that the both sides of the edge of first unipolar plate
Be equipped with coolant liquid supporting point, the coolant liquid supporting point in first unipolar plate and the second unipolar plate cooperatively form coolant liquid into
Outlet.
8. fuel battery metal double polar plate as described in claim 1, which is characterized in that first unipolar plate and the second monopole
Plate is just equipped with sealant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811611569.6A CN109473693A (en) | 2018-12-27 | 2018-12-27 | A kind of fuel battery metal double polar plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811611569.6A CN109473693A (en) | 2018-12-27 | 2018-12-27 | A kind of fuel battery metal double polar plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109473693A true CN109473693A (en) | 2019-03-15 |
Family
ID=65678048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811611569.6A Pending CN109473693A (en) | 2018-12-27 | 2018-12-27 | A kind of fuel battery metal double polar plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109473693A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993985A (en) * | 2019-12-14 | 2020-04-10 | 中国科学院大连化学物理研究所 | Flow channel structure of metal bipolar plate flow field of fuel cell |
| CN113809350A (en) * | 2021-08-30 | 2021-12-17 | 一汽解放汽车有限公司 | Fuel cell, cell unit and electrode plate |
| CN114551925A (en) * | 2020-11-25 | 2022-05-27 | 中国科学院大连化学物理研究所 | A laser-welded flow battery electrode frame structure and flow battery stack |
| CN114864982A (en) * | 2022-05-24 | 2022-08-05 | 上海骥翀氢能科技有限公司 | Stamped metal bipolar plate and fuel cell |
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| CN101101993A (en) * | 2007-08-02 | 2008-01-09 | 上海交通大学 | Bipolar plates for proton exchange membrane fuel cells based on sheet stamping |
| KR20120048443A (en) * | 2010-11-05 | 2012-05-15 | 현대자동차주식회사 | Metal seperator assembly for fuel cell |
| CN103633346A (en) * | 2013-12-09 | 2014-03-12 | 新源动力股份有限公司 | Simplified fuel cell structure |
| CN104868129A (en) * | 2015-05-26 | 2015-08-26 | 昆山弗尔赛能源有限公司 | Metal bipolar plate for proton exchange membrane fuel cell |
| CN108695524A (en) * | 2018-07-03 | 2018-10-23 | 武汉轻工大学 | Dual polar plates of proton exchange membrane fuel cell |
| CN209357835U (en) * | 2018-12-27 | 2019-09-06 | 弗尔赛（上海）能源科技有限公司 | A kind of fuel battery metal double polar plate |
-
2018
- 2018-12-27 CN CN201811611569.6A patent/CN109473693A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101101993A (en) * | 2007-08-02 | 2008-01-09 | 上海交通大学 | Bipolar plates for proton exchange membrane fuel cells based on sheet stamping |
| KR20120048443A (en) * | 2010-11-05 | 2012-05-15 | 현대자동차주식회사 | Metal seperator assembly for fuel cell |
| CN103633346A (en) * | 2013-12-09 | 2014-03-12 | 新源动力股份有限公司 | Simplified fuel cell structure |
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| CN108695524A (en) * | 2018-07-03 | 2018-10-23 | 武汉轻工大学 | Dual polar plates of proton exchange membrane fuel cell |
| CN209357835U (en) * | 2018-12-27 | 2019-09-06 | 弗尔赛（上海）能源科技有限公司 | A kind of fuel battery metal double polar plate |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993985A (en) * | 2019-12-14 | 2020-04-10 | 中国科学院大连化学物理研究所 | Flow channel structure of metal bipolar plate flow field of fuel cell |
| CN114551925A (en) * | 2020-11-25 | 2022-05-27 | 中国科学院大连化学物理研究所 | A laser-welded flow battery electrode frame structure and flow battery stack |
| CN113809350A (en) * | 2021-08-30 | 2021-12-17 | 一汽解放汽车有限公司 | Fuel cell, cell unit and electrode plate |
| CN113809350B (en) * | 2021-08-30 | 2023-10-17 | 一汽解放汽车有限公司 | Fuel cell and cell unit |
| CN114864982A (en) * | 2022-05-24 | 2022-08-05 | 上海骥翀氢能科技有限公司 | Stamped metal bipolar plate and fuel cell |
| CN114864982B (en) * | 2022-05-24 | 2024-06-04 | 上海骥翀氢能科技有限公司 | Stamped metal bipolar plate and fuel cell |
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