IE44004B1 - Cylindrical electrochemical cell - Google Patents
Cylindrical electrochemical cellInfo
- Publication number
- IE44004B1 IE44004B1 IE2828/76A IE282876A IE44004B1 IE 44004 B1 IE44004 B1 IE 44004B1 IE 2828/76 A IE2828/76 A IE 2828/76A IE 282876 A IE282876 A IE 282876A IE 44004 B1 IE44004 B1 IE 44004B1
- Authority
- IE
- Ireland
- Prior art keywords
- cover
- cell
- cell according
- peripheral portion
- rim
- Prior art date
Links
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 239000011149 active material Substances 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000002999 depolarising effect Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/154—Lid or cover comprising an axial bore for receiving a central current collector
-
- 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)
- Sealing Battery Cases Or Jackets (AREA)
- Primary Cells (AREA)
Description
The present invention relates to a cylindrical electrochemical cell, and more particularly, but not exclusively, to such a cell Intended to be used in a battery of two or more interconnected cells.
The term cylindrical is used in this specification in the broad sense of the shape generated by a straight line moving parallel to itself and describing with its ends any fixed curve, an example being a circular cylinder.
For reasons of economy such cells are often not provided with individual leak-proofing or plastic covering. Nevertheless, they naturally need some degree of sealing in order to keep the electrolyte in the cell and prevent it from prematurely damaging the battery housing.
A typical example of a battery including such cells is a 4.5 Volt flat battery comprising three cells housed in a carton for use in a pocket torch, or else directly housing in the body of a disposable torch.
According to the present invention, there is provided a cylindrical electrochemical cell including:
a) a cylindrical metal can open at one end, which can forms a first terminal of the cell;
b) an insulating cover for closing off the open end of the can, the cover including a peripheral portion which fits over and surrounds the rim of the can; and
c) an annular metal band which surrounds, and is in intimate contact with, both the peripheral portion of the cover and the can so as to secure the peripheral portion of the cover to the can.
Preferably also the can in the vicinity of the rim is inwardly inclined and the peripheral portion of the cover is so shaped that it fits over the inwardly inclined rim region in such a manner that the outer diameter of the cell is substantially constant over its complete length.
The band is conveniently made of tinplated steel, having one edge crimped onto the peripheral portion of the cover and its other edge penetrating into cylindrical side wall(s) of the can in the vivinity of the rim.
In previously known cells (e.g. as described in French Patent No. 1 221 765) comprising a metal can open at one end and a cover for closing off the open end of the can, the cover has been in the form of a plug fitted inside the can. In order to ensure an adequately long leakage path between the interior of the cell and the outside the plug must extend part of the way into the can. The part of the can into which the plug extends cannot be lined with a separator which is usual in zinc can primary cells for separating the can from the active material, since such separators are porous and the electrolyte would leak out of the cell by way of the separator. Furthermore, in order to avoid possible tearing of the separator during assembly, it has proved necessary to leave a gap between the end of the separator and the plug. Lastly, the separator must extend beyond the active material (depolarizing mix) in order to prevent the material from coming into contact with the zinc can. These constraints have combined to make it usual for such cells to have a fairly large space free of active material within a can of standard exterior volume, thereby limiting the quantity of
4&θθ 4 active material which may be contained within the cell.
In the cell of the present invention the cover has a peripheral portion which fits over the outside of the can and thus it is possible in such a construction to leave the inside of the can free to be lined over its entire length with a separator.
Preferred embodiments of the present invention therefore provide a greater usable volume for active material which may fill the can nearly to its brim. This greater volume may be used to provide a better performance cell than an equivalent cell of the prior art by using a greater quantity of active material, or a cheaper cell by using a cheaper active material of lesser specific capacity (by volume) whose performance is brought up to the standard of the prior art cell by providing an extra volume of the material such that the material still costs less for the greater volume.
It may be possible in the latter case to reduce the thickness of the zinc can, since a larger surface of zinc is used to contain active material of the same capacity, thereby providing a further saving.
The present invention will be better understood from the following description of one embodiment of cylindrical electrochemical cell according to the present invention given by way of example with reference to the single figure of the accompanying drawing which is a sectional view of this cell.
Referring to the figure, the cell comprises a zinc can 1 which forms a first terminal of the cell and which contains active material in the form of a depolarizing mix 2 and a carbon rod 3. The depolarizing mix 2 is separated from the bottom of the can by an insulating disc and from the curved wall of the can by a separator 5 made of paper impregnated with electrolyte. The rim 6 of the can 1 is inclined inwardly, thereby stiffening the can. The can is closed by a cover 8 of plastics material, such as polyethylene for example, through which the rod 3 extends.
The cover has a peripheral portion in the form of an outer skirt 10 which fits over and surrounds the rim of the can.
The cover 8 also has a central skirt 9 which embraces the rod 3. The rod 3 is topped by a brass cap 7 which, forms a second terminal of the cell. A metallic band surrounds the cover 8 forming a ring ll having one edge turned down over a shoulder of the cover 8 and its other edge penetrating slightly into the zinc round the non-inolined portion of the can, this penetration being effected, for example, by swaging, thereby securing the cover 8 to the can 1. As this other edge is close to the angle formed by the inclined rim 6 of the can 1, it meets a portion of the can 1 which is stiffened by the angle and which consequently has good mechanical resistance to the force exerted by the swaging. As can be seen in the figure, the outer skirt 10 is pressed between two metal portions (the rim 6 and the ring 11) and provides good sealing and a long leakage path. The ring 11 is preferably made of tin-plated steel.
Electrical connections 13 and 14 are fixed respectively to the brass cap 7 and to the ring XI and are used for connecting the cell in series with adjacent cells in a battery of cells. An upwardly projecting portion 12 of the cover 8 prevents the connection 13 from coming into contact with the ring 11, since this would short-circuit the cell.
The top edge of the separator 5 comes practically up to the same height as the rim 6 of the can 1 which can therefore be filled with the depolarizing mix up to a very short distance from the rim 6 without danger of a shortcircuit. The empty space in the cell is therefore small and an increased volume of depolarizing mix can be used with respect to an equivalent cell of the prior art. Also
- 6 the outer skirt 10 of the cover 8 can be shorter than the plugs of the cells of the prior art since the effective leakage path is doubled by the ring 11, in view of the fact that the leakage path comprises one portion between the rim 6 and the inside edge of the skirt 10 and a second portion between the ring 11 and the outside edge of the skirt 10.
Claims (8)
1. CLAIM S;1. A cylindrical electrochemical cell including: a) a cylindrical metal can open at one and which can forms a first terminal of the cell; b) an insulating cover for closing off the open end of the can, the cover including a peripheral portion which fits over and surrounds the rim of the can; and c) an annular metal band which surrounds, and is in intimate contact with, both the peripheral portion of the cover and the can so as to secure the peripheral portion of the cover to the can.
2. A cell according to claim 1, wherein the can in the vicinity of the rim is inwardly inclined.
3. A cell according to claim 2, wherein the peripheral portion of the cover is so shaped that it fits over the inwardly inclined rim region in such a manner that the outer diameter of the cell is substantially constant over its complete length.
4. A cell according to claim 1, 2 and 3, wherein the annular metal band is constituted by tin-plated steel.
5. Polarity to the first terminal, which second terminal projects through the cover.
10. A cylindrical electrochemical cell substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawing.
5. A cell according to any preceding claim, wherein the annular metal band is crimped onto the peripheral portion of the cover along one of its edges.
6. A cell according to any preceding claim, wherein one of the edges of the annular metal band penetrates into the cylindrical side wall(s) of the can in the vicinity of the rim.
7. A cell according to any preceding claim, which also includes a separator for separating the can from active material within the can. -
8. 8. A cell according to any preceding claim, wherein the can is made of zinc.
9. A cell according to any preceding claim, which also includes an elongate second terminal of opposite 10
11. A battery comprising a plurality of cells accord ing to any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7539732A FR2336809A1 (en) | 1975-12-24 | 1975-12-24 | CYLINDRICAL TYPE ELECTRIC BATTERY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE44004L IE44004L (en) | 1977-06-24 |
| IE44004B1 true IE44004B1 (en) | 1981-07-15 |
Family
ID=9164165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE2828/76A IE44004B1 (en) | 1975-12-24 | 1976-12-23 | Cylindrical electrochemical cell |
Country Status (10)
| Country | Link |
|---|---|
| BE (1) | BE849329A (en) |
| DE (1) | DE2657369A1 (en) |
| DK (1) | DK582976A (en) |
| FR (1) | FR2336809A1 (en) |
| GB (1) | GB1544287A (en) |
| IE (1) | IE44004B1 (en) |
| IT (1) | IT1065464B (en) |
| LU (1) | LU76385A1 (en) |
| NL (1) | NL7614223A (en) |
| OA (1) | OA05511A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3494802A (en) * | 1968-02-19 | 1970-02-10 | Union Carbide Corp | Dry cell with novel venting means |
-
1975
- 1975-12-24 FR FR7539732A patent/FR2336809A1/en active Granted
-
1976
- 1976-12-13 BE BE1007818A patent/BE849329A/en unknown
- 1976-12-13 OA OA56013A patent/OA05511A/en unknown
- 1976-12-15 LU LU76385A patent/LU76385A1/xx unknown
- 1976-12-17 DE DE19762657369 patent/DE2657369A1/en not_active Withdrawn
- 1976-12-20 GB GB53166/76A patent/GB1544287A/en not_active Expired
- 1976-12-21 NL NL7614223A patent/NL7614223A/en not_active Application Discontinuation
- 1976-12-22 IT IT30746/76A patent/IT1065464B/en active
- 1976-12-23 DK DK582976A patent/DK582976A/en unknown
- 1976-12-23 IE IE2828/76A patent/IE44004B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK582976A (en) | 1977-06-25 |
| FR2336809A1 (en) | 1977-07-22 |
| DE2657369A1 (en) | 1977-07-14 |
| IT1065464B (en) | 1985-02-25 |
| IE44004L (en) | 1977-06-24 |
| FR2336809B1 (en) | 1978-06-30 |
| BE849329A (en) | 1977-06-13 |
| LU76385A1 (en) | 1977-06-28 |
| OA05511A (en) | 1981-04-30 |
| NL7614223A (en) | 1977-06-28 |
| GB1544287A (en) | 1979-04-19 |
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