IE50483B1 - Electrical feedthrough with molded portion for electrochemical cells - Google Patents
Electrical feedthrough with molded portion for electrochemical cellsInfo
- Publication number
- IE50483B1 IE50483B1 IE2522/80A IE252280A IE50483B1 IE 50483 B1 IE50483 B1 IE 50483B1 IE 2522/80 A IE2522/80 A IE 2522/80A IE 252280 A IE252280 A IE 252280A IE 50483 B1 IE50483 B1 IE 50483B1
- Authority
- IE
- Ireland
- Prior art keywords
- feedthrough
- ferrule
- lead
- plastics body
- textured
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000004033 plastic Substances 0.000 claims description 24
- 229920003023 plastic Polymers 0.000 claims description 24
- 239000011521 glass Substances 0.000 claims description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 3
- 229920001780 ECTFE Polymers 0.000 claims description 3
- -1 ethylene-chlorotrifluoroethylene Chemical group 0.000 claims description 3
- 229910052740 iodine Inorganic materials 0.000 claims description 3
- 239000011630 iodine Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 claims 2
- 238000000034 method Methods 0.000 claims 2
- 239000005355 lead glass Substances 0.000 claims 1
- 229920001169 thermoplastic Polymers 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 239000002991 molded plastic Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 2
- YFXWODPYUNGUEE-UHFFFAOYSA-N [I].[Li] Chemical compound [I].[Li] YFXWODPYUNGUEE-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229920006370 Kynar Polymers 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920006355 Tefzel Polymers 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 208000018999 crinkle Diseases 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- QHSJIZLJUFMIFP-UHFFFAOYSA-N ethene;1,1,2,2-tetrafluoroethene Chemical compound C=C.FC(F)=C(F)F QHSJIZLJUFMIFP-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/191—Inorganic material
-
- 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
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
An electrical feedthrough including a metal ferrule 24 and a molded plastics protective body 30 molded to the ferrule. The feedthrough is particularly adapted for use in electrochemical cells. A method of manufacturing the feedthrough is also described.
Description
This invention relates to improved electrical feedthroughs and to electrochemical cells which use the same. A method of making the feedthrough is also described.
Electrical feedthroughs have many uses. For example, they are used in electrochemical cells to provide for the insertion of an electrical lead or pin through the case or container of the cell and to facilitate contact of the lead to an electrode in the cell. The feedthrough insulates the lead from the container case.
Feedthroughs usually include a metal ferrule through which the lead extends. When the feedthrough is mounted, the ferrule in turn extends through the container case and is attached to it, as by welding.
When used in cells such as lithium-iodine batteries or the like, portions of the feedthrough lead inside the cell must be protected from contact with the cell contents, such as iodine, which may detrimentally affect the metal portions of the feedthrough.
Viewed from one aspect the present invention provides a feedthrough for an electrochemical cell, comprising a metal ferrule having a textured external surface portion, a conductive lead extending through the ferrule with elongate portions of the lead extending from both of the open ends of the ferrule, glass seal means hermetically sealing the lead within the ferrule, and a plastics body molded to the ferrule at the said textured surface thereof, the body additionally enclosing a length of the lead.
The invention further provides an electrochemical cell comprising anode and cathode electrode means enclosed in a container and a feedthrough as set forth above extending through a wall of the container and having its said conductive lead electrically connected to one of the said electrodes, the said metal ferrule being attached to the container and having a portion extending into the container, and the said plastics body being inside the container and arranged to protect the feedthrough from contact with the cell contents.
Viewed from another aspect the invention provides a method of manufacturing an electrical feedthrough as set forth above, comprising forming an electrically insulating glass seal between a conductive lead and a metal ferrule through which the lead extends, the ferrule having a textured external surface portion, and molding a plastics body to the ferrule around the textured portion thereof and around the lead.
An embodiment of the invention will now be described by way of example and with reference to the accompanying drawings, in which:Figure 1 is a sectional view of a cell utilising a feedthrough of the invention; and Figure 2 is an enlarged sectional view of the feedthrough of Figure 1.
A lithium-iodine cell incorporating a feedthrough according to the invention comprises a container or casing 10 of stainless steel which is preferably shaped as shown in Figure 1, and which is relatively thin (not shown) as compared to its width, shown in the Figure. Casing 10 has an open top which is closed and sealed by a lid 12 welded to the casing.
The cell includes anode electrode means 14 and cathode electrode means 16. As is already known in the art, anode means 14 may include lithium pressed on a current collector (not shown). The lithium may .-3be partly held within a plastics frame or band 18 of a suitable material such as the plastic known as Halar, a registered trade mark of Allied Chemical Corporation, more specifically identified as ethylene5 chlorotrifluorethylene (ECTFE). Other plastics such as Kynar, a trade mark of Pennwalt Corporation, 3 Parkway, Philadelphia, PA 19102 for polyvinylidene fluoride and Tefzel, a trade mark of E.I. du Pont de Nemours, Co., Wilmington, Del. 19898, for a co-polymer of ethylene and tetrafluoroethylene may be used.
Frame 18 is provided with an aperture (not shown) through which lead pin 22 of electrical feedthrough 20 extends to contact the anode electrode means. The anode may also be provided with a thin coating 21 of poly-2-vinyl-pyridine. A cell of this type is shown in DS Patent 4 128 703, the details of which are incorporated herein by reference.
Feedthrough 20 is shown in more detail in Figure 2 and comprises a metal ferrule 24 through which lead pm 22 extends. The lead pin and ferrule may both be stainless steel. Pin 22 is held in position in ferrule 24 and insulated therefrom by means of a glass seal 26.
Ferrule 24 has formed about its lower external periphery at least one groove, preferably a plurality of spaced grooves 28 as shown. Grooves 28 are positioned on the ferrule so as to be inside of casing 10 when ferrule 24 is attached to lid 12, as by welding, and as shown in Figure 1. A plastics, non-conductive body 30 which is inert to cell contents, preferably of the aforementioned ECTFE composition or other previously described plastic composition, is molded around a portion of ferrule 24 so as to contact grooves 28 and around a portion of pin 22. Body 30 is preferably injection molded around ferrule 24 and around lead pin 22.
It preferably comprises an upper cylindrical portion 30a which encases the grooved portion of ferrule 24 as shown and a lower or cylindrical portion 30b which encases a portion of lead pin 22 and contacts anode 14 by extending into it.
In place of grooves 28, the ferrule may be threaded or its surface may be roughened, as by grit blasting, to facilitate connection between the ferrule and the plastic body. However, grooves 28 are preferred as they are discontinuous relative to each other and do not provide a potentially continuous path for leakage.
All of these are collectively described herein as providing a textured contact surface on the ferrule for establishing gripping contact between it and the plastics body molded to it.
Feedthrough 20 is assembled by inserting lead pin 20 into a glass preform which may or may not already be mounted in the ferrule. The three-piece assembly is then heated in an oven to fuse the glass and form an insulating seal between the lead pin and the ferrule. Plastics body 30 is thereafter injection molded around the groove or grooves 28 on ferrule 24 and to lead pin 22 by conventional molding practices. The resultant feedthrough assembly 20 is welded to lid 12. The lower end of lead pin 22 is connected to a metal anode current collector (not shown). Lithium for anode 14 is pressed over the collector and lower portion 30b of plastic body 30 as can be seen in Figure 1. The surface of portion 30b is also preferably textured to facilitate locking or gripping contact between it and the electrode means. For example, the plastic may be chemically etched as with Chem-Grip, a high flashpoint etching solution containing an active form of sodium marketed by Chemplast, Inc., 150 Dey Road, Wayne, N.J. 07470, or it may be mechanically roughened or otherwise roughened to a predetermined rough finish or a crinkle finish such as a 240 microinch surface finish or an EDM^36 finish.
The resultant feedthrough - anode assembly is positioned in an aperture of lid 12 and ferrule 24 is welded thereto. The entire assembly is then inserted into casing 10 and lid 12 is welded to the casing. Thereafter, the cathode material 16 is poured into the cell as described below. In the particular cell design described, casing 10 functions as the cathode collector/electrode.
Cathode 16 comprises an iodine containing material including poly-2-vinylpyridine (P2VP) as is known in the art. Other materials may be used but P2VP is preferred. It may be prepared by heating the polymer and adding desired amounts of iodine thereto, usually in excess of about 50 percent by weight. The material may be poured into casing 10 through access aperture 32, provided in lid 12 for this purpose. Lid 12, feedthrough 20 and anode means 14 will have been previously assembled into case 10. Aperture 32 will thereafter be welded closed with a closure member 34 therein.
The foregoing arrangement provides a feedthrough in which the lead pin is protected from cell contents by an injection molded body attached to the grooved ferrule. The seal of ethylene-chlorotrifluorethylene to the spaced grooves and outside ferrule wall on the ferrule provides protection against leakage, via the interface, such as cathode leakage into the anode collector/electrode.
Claims (18)
1. A feedthrough for an electrochemical cell, comprising a metal ferrule having a textured external surface portion, a conductive lead extending through the ferrule with elongate portions of the lead extending from both of the open ends of the ferrule, glass seal means hermetically sealing the lead within the ferrule, and a plastics body molded to the ferrule at the said textured surface thereof, the body additionally enclosing a length of the lead.
2. A feedthrough structure as claimed in claim 1, wherein the said textured surface portion of the ferrule comprises at least one peripherial groove formed therein transverse to the longitudinal axis of the ferrule and the pin.
3. A feedthrough as claimed in claim 2, including a plurality of said grooves.
4. A feedthrough as claimed in any of claims 1 to 3, wherein the said plastics body comprises a cylindrical portion around the ferrule and a narrower elongate tapered portion around the lead with a shoulder portion therebetween.
5. A feedthrough as claimed in claim 4, wherein the external surface of the said tapered portion of the plastics body is textured.
6. A feedthrough as claimed in claim 5, wherein the texture of the plastics body is about a 240 microinch finish.
7. A feedthrough as claimed in claim 5, wherein the texture of the plastics body is about an EDM$36 finish.
8. A feedthrough as claimed in any of the preceding 5 claims, wherein the said plastics body comprises thermoplastic.
9. A feedthrough as claimed in claim 8, wherein the termoplastic is ethylene-chlorotrifluoroethylene.
10. A feedthrough for an electrochemical cell, 10 substantially as hereinbefore described with reference to Figure 2 of the accompanying drawings.
11. An electrochemical cell comprising anode and cathode electrode means enclosed in a container, and a feedthrough as claimed in any of claims 1 to 10 15 extending through a wall of the container and having its said conductive lead electrically connected to one of the said electrodes, the said metal ferrule being attached to the container and having a portion extending into the container, and the said plastics body being 20 inside the container and arranged to protect the feedthrough from contact with the cell contents.
12. A cell as claimed in claim 11, wherein the lead and the plastics body molded on the ferrule extend into the said one electrode means and the portion of the 25 plastics body inside the electrode is externally textured.
13. A cell as claimed in claim 11 or 12, wherein the container is metal, the anode comprises lithium, and the cathode is an iodine containing cathode.
14. An electrochemical cell substantially as hereinbefore described with reference to the accompanying drawings.
15. A method of manufacturing an electrical feedthrough as claimed in claim 1, comprising forming an electrically insulating glass seal between a conductive lead and a metal ferrule through which the lead extends, the ferrule having a textured external surface portion, and molding a plastics body to the ferrule around the textured portion thereof and around the lead.
16. A method as claimed in claim 15, in which the molding is by injection molding.
17. A method as claimed in claim 16, wherein the plastic is ethylene-chlorotrifluoroethylene and it is heated to an elevated injection molding temperature and caused to flow into a preheated mold containing the ferrulc-lead-glass seal assembly.
18. A method of manufacturing an electrical feedthrough, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10027479A | 1979-12-04 | 1979-12-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE802522L IE802522L (en) | 1981-06-04 |
| IE50483B1 true IE50483B1 (en) | 1986-04-30 |
Family
ID=22278944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE2522/80A IE50483B1 (en) | 1979-12-04 | 1980-12-03 | Electrical feedthrough with molded portion for electrochemical cells |
Country Status (4)
| Country | Link |
|---|---|
| DE (2) | DE8032202U1 (en) |
| FR (1) | FR2471672A1 (en) |
| GB (1) | GB2067345B (en) |
| IE (1) | IE50483B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0541241A (en) * | 1991-05-30 | 1993-02-19 | Fuji Electric Co Ltd | Solid electrolyte type fuel cell |
| WO2020104571A1 (en) * | 2018-11-23 | 2020-05-28 | Schott Ag | Electrical feedthrough glass-metal electrodes |
| DE102020107224A1 (en) * | 2020-03-17 | 2021-09-23 | Schott Ag | Electrical facility |
| DE102021122596A1 (en) | 2021-09-01 | 2023-03-02 | Schott Ag | EXECUTION |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4128703A (en) * | 1977-07-05 | 1978-12-05 | Wilson Greatbatch Ltd. | Lithium-iodine cell |
-
1980
- 1980-12-03 IE IE2522/80A patent/IE50483B1/en not_active IP Right Cessation
- 1980-12-03 DE DE19808032202U patent/DE8032202U1/en not_active Expired
- 1980-12-03 GB GB8038680A patent/GB2067345B/en not_active Expired
- 1980-12-03 DE DE19803045594 patent/DE3045594A1/en active Granted
- 1980-12-04 FR FR8025746A patent/FR2471672A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE3045594A1 (en) | 1981-06-11 |
| IE802522L (en) | 1981-06-04 |
| FR2471672A1 (en) | 1981-06-19 |
| DE8032202U1 (en) | 1981-04-02 |
| GB2067345B (en) | 1983-05-25 |
| GB2067345A (en) | 1981-07-22 |
| DE3045594C2 (en) | 1991-10-31 |
| FR2471672B3 (en) | 1982-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Patent lapsed |