CA1166307A - Electrical accumulator - Google Patents
Electrical accumulatorInfo
- Publication number
- CA1166307A CA1166307A CA000391384A CA391384A CA1166307A CA 1166307 A CA1166307 A CA 1166307A CA 000391384 A CA000391384 A CA 000391384A CA 391384 A CA391384 A CA 391384A CA 1166307 A CA1166307 A CA 1166307A
- Authority
- CA
- Canada
- Prior art keywords
- edge
- plates
- strips
- separator
- electrical accumulator
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
-
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/466—U-shaped, bag-shaped or folded
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
ABSTRACT
In an electrical accumulator, better utilization of the width of the cell is achieved if the edges of the separators which usually project beyond the contour of the electrode plates, are bent over almost at right angles and thus also cover the edge of the plates. This arrangement reduces the normal distance between the stack of plates and the wall of the housing, corresponding to the edge-width of the separators, to the lesser distance. The louvre-like overlapping of the separator edges may be fixed by welding. A stack of plates thus separated is easy to handle and is more easily positioned during assembly.
In an electrical accumulator, better utilization of the width of the cell is achieved if the edges of the separators which usually project beyond the contour of the electrode plates, are bent over almost at right angles and thus also cover the edge of the plates. This arrangement reduces the normal distance between the stack of plates and the wall of the housing, corresponding to the edge-width of the separators, to the lesser distance. The louvre-like overlapping of the separator edges may be fixed by welding. A stack of plates thus separated is easy to handle and is more easily positioned during assembly.
Description
3~)~
IIighly porous separators are generally used in galvanic elements to separate electrodes of different polarity. In lead accumulators, these separators are usually wider and higher than the corresponding electrode plates. The resulting overhang should be as equal as possible on each side to prevent the occurrence of short-circuits as a result of electrode growth o~
an outgrowth of conductive material. Instead of individual separators, use is being made to an increasing extent of so-called pockets made of an appropriate, preferably formable, material, each pocket generally enclosing one plate of one of the two types of electrodes and being open only at the top.
Such separators need no lateral projection beyond the width of the electrodes in order to prevent short-circuiting.
However, the separator-pockets are generally made out of sections of strip material which are folded in the vicinity of the lower edge of the electrode and are welded laterally, for example by heat or ultrasonics. As a result the lateral seams thus formed, pro~ect beyond the width of the plate to the same extent as the individual separators traditionally used.
The electrode separation which is achievable by means of pockets disclosed in &erman Patent 2 330 134 reveals this problem very clearly. This enclosing of the plates has the disadvantage that the electrode does not occupy the full width of the cell of the galvanic element. r~oreover, the fact that separators and separator-pockets are wider than the electrodes interferes with the correct alignment, transportation and positioning of the block of plates necessary for the satisfactory ` l ~ 8~3~7 assembly of the cell. These difficulties increase substantially as the number of plates per element increases and as the thickness of plates and separators decreases.
A separator which eliminates major projection of the covering foil beyond the edges of the plate is disclosed in German OS 2 45~ 824. In this case, the edges of the covering foil, which project only slightly beyond the contour of the electrode, are joined together by a flat, rigid strip and the edges of the electrode are closed off as if by a smooth strip. However, since this strip is applied in the form of an adhesive compound which hardens only gradually, the production process is costly and time-consuming.
It is therefore an object of the invention to provide separation, especially for lead aeeumulators, whieh will allow the eleetrode plates to make better use of the width of the eell but does not make it difficult to install the stack of plates in the cell, which also ensures reliable insulation of the lateral edges of the plates, and the manufacturing process of which is not detrimental to mass-production.
According to the invention, this object is achieved by use of laterally projecting separator edge-strips which are bent and cover at least the edge of each eleetrode.
It is partieularly advantageous for the separator material used for the complete covering of the edges of the eleetrodes to be a thermoplastic synthetic material, since this allows the edge-strips to be welded or glued together.
However, aeeording to the invention, a less easily ~ ~B63~7 workable synthe-tic material may also be used for the separators.
Individual separators of this kind, made for example of hard PVC, may be provided, with profiled strips of more easily formed material, for example soft PVC, instead of projecting edge-strips.
~his anticipates the bending of the edge-strips which should be bent over, if possible through more than 60, up to a maximum of 90, parallel with the sides of the electrodes.
In the case of separator-pockets, which may also be used instead of individual separators and which contain a single electrode plate of one polarity or the other, the material used is naturally a thermoplastically formable material. In forming these pockets, by welding the edges laterally, it is desirable to carry out this procedure with a welding unit designed in such a manner that the welded edges are simultaneously bent over as far as possible.
In all of the above-mentioned cases, stacking the plates with their separators produces an electrode assembly in which the alignment from electrode to electrode is accommodated to a large degree by the projecting edges of the interleaved separators.
Although the width of these edge-strips and the amount of the original lateral projection, or of the weld seams in the case of pockets, must be adapted to the relevant cell design and method of assembly~ the edge-strips must at least cover the edges of the electrode. All of the edge-strips overlap on each side like louvres, and it is possible to press the raised edges of t:he separator material, which is generally resilient, directly against the edges of the p~ates or the lateral surface of the plate 3~
assembly. A stack of electrodes thus separated can be gripped~ transported and positioned - either manually or, in particular, mechanically - without sacrificing the alignment thereby avoiding the need for restoring alignment through additional operational steps. According to the invention, this advantage may be still further increased in that the edge-strips, pressed laterally to the plate assembly, may be we'ded or glued together.
Depending upon the design of the cell~ care must be taken, under certain circumstances and by means of assembly-aids or by means of an additional folding over of the raised edges of the uppermost separator or separator-pocket, to ensure that the latter do not interfere with the assembl-ing of the battery if~ in the raised position~ they would increase the height of the plate assembly beyond the available cell height.
In accordance with the present invention, there is provided an electrical accumulator having a porous separator which insulates the plates of an assembly of electrodes from each other and projects beyond the contour of the said plates, characteri~ed in that the laterally projecting edge-strips of the separator are bent through an angle of between 60 and 90 so that the edge-strip covers at least the edge of each electrode.
The object of the invention is explained hereinafter in conjunction with Figures 1 and 2 wherein:
Figure 1 illustrates ends of electrode plates mounted with separators according to the present invention;
Figure 2(a) illustrates conventional separating devices;
Figure 2(b) illustrates ends of electrode plates mounted with separators according to another embodiment of the present invention.
Figure 1 shows positive electrode plates 1 assembled into a stack l B63~ 7 with negative electrode plates 2 and intervening individual separators 4, the edges 5 of which are bent through approximately 90 and are welded to-gether. End-electrode 1 requires an additional fold 6 and an attachment 7.
The distance - 4a -"
J 16~3~
z between the container wall 8 and the ends of the plates 1 and
IIighly porous separators are generally used in galvanic elements to separate electrodes of different polarity. In lead accumulators, these separators are usually wider and higher than the corresponding electrode plates. The resulting overhang should be as equal as possible on each side to prevent the occurrence of short-circuits as a result of electrode growth o~
an outgrowth of conductive material. Instead of individual separators, use is being made to an increasing extent of so-called pockets made of an appropriate, preferably formable, material, each pocket generally enclosing one plate of one of the two types of electrodes and being open only at the top.
Such separators need no lateral projection beyond the width of the electrodes in order to prevent short-circuiting.
However, the separator-pockets are generally made out of sections of strip material which are folded in the vicinity of the lower edge of the electrode and are welded laterally, for example by heat or ultrasonics. As a result the lateral seams thus formed, pro~ect beyond the width of the plate to the same extent as the individual separators traditionally used.
The electrode separation which is achievable by means of pockets disclosed in &erman Patent 2 330 134 reveals this problem very clearly. This enclosing of the plates has the disadvantage that the electrode does not occupy the full width of the cell of the galvanic element. r~oreover, the fact that separators and separator-pockets are wider than the electrodes interferes with the correct alignment, transportation and positioning of the block of plates necessary for the satisfactory ` l ~ 8~3~7 assembly of the cell. These difficulties increase substantially as the number of plates per element increases and as the thickness of plates and separators decreases.
A separator which eliminates major projection of the covering foil beyond the edges of the plate is disclosed in German OS 2 45~ 824. In this case, the edges of the covering foil, which project only slightly beyond the contour of the electrode, are joined together by a flat, rigid strip and the edges of the electrode are closed off as if by a smooth strip. However, since this strip is applied in the form of an adhesive compound which hardens only gradually, the production process is costly and time-consuming.
It is therefore an object of the invention to provide separation, especially for lead aeeumulators, whieh will allow the eleetrode plates to make better use of the width of the eell but does not make it difficult to install the stack of plates in the cell, which also ensures reliable insulation of the lateral edges of the plates, and the manufacturing process of which is not detrimental to mass-production.
According to the invention, this object is achieved by use of laterally projecting separator edge-strips which are bent and cover at least the edge of each eleetrode.
It is partieularly advantageous for the separator material used for the complete covering of the edges of the eleetrodes to be a thermoplastic synthetic material, since this allows the edge-strips to be welded or glued together.
However, aeeording to the invention, a less easily ~ ~B63~7 workable synthe-tic material may also be used for the separators.
Individual separators of this kind, made for example of hard PVC, may be provided, with profiled strips of more easily formed material, for example soft PVC, instead of projecting edge-strips.
~his anticipates the bending of the edge-strips which should be bent over, if possible through more than 60, up to a maximum of 90, parallel with the sides of the electrodes.
In the case of separator-pockets, which may also be used instead of individual separators and which contain a single electrode plate of one polarity or the other, the material used is naturally a thermoplastically formable material. In forming these pockets, by welding the edges laterally, it is desirable to carry out this procedure with a welding unit designed in such a manner that the welded edges are simultaneously bent over as far as possible.
In all of the above-mentioned cases, stacking the plates with their separators produces an electrode assembly in which the alignment from electrode to electrode is accommodated to a large degree by the projecting edges of the interleaved separators.
Although the width of these edge-strips and the amount of the original lateral projection, or of the weld seams in the case of pockets, must be adapted to the relevant cell design and method of assembly~ the edge-strips must at least cover the edges of the electrode. All of the edge-strips overlap on each side like louvres, and it is possible to press the raised edges of t:he separator material, which is generally resilient, directly against the edges of the p~ates or the lateral surface of the plate 3~
assembly. A stack of electrodes thus separated can be gripped~ transported and positioned - either manually or, in particular, mechanically - without sacrificing the alignment thereby avoiding the need for restoring alignment through additional operational steps. According to the invention, this advantage may be still further increased in that the edge-strips, pressed laterally to the plate assembly, may be we'ded or glued together.
Depending upon the design of the cell~ care must be taken, under certain circumstances and by means of assembly-aids or by means of an additional folding over of the raised edges of the uppermost separator or separator-pocket, to ensure that the latter do not interfere with the assembl-ing of the battery if~ in the raised position~ they would increase the height of the plate assembly beyond the available cell height.
In accordance with the present invention, there is provided an electrical accumulator having a porous separator which insulates the plates of an assembly of electrodes from each other and projects beyond the contour of the said plates, characteri~ed in that the laterally projecting edge-strips of the separator are bent through an angle of between 60 and 90 so that the edge-strip covers at least the edge of each electrode.
The object of the invention is explained hereinafter in conjunction with Figures 1 and 2 wherein:
Figure 1 illustrates ends of electrode plates mounted with separators according to the present invention;
Figure 2(a) illustrates conventional separating devices;
Figure 2(b) illustrates ends of electrode plates mounted with separators according to another embodiment of the present invention.
Figure 1 shows positive electrode plates 1 assembled into a stack l B63~ 7 with negative electrode plates 2 and intervening individual separators 4, the edges 5 of which are bent through approximately 90 and are welded to-gether. End-electrode 1 requires an additional fold 6 and an attachment 7.
The distance - 4a -"
J 16~3~
z between the container wall 8 and the ends of the plates 1 and
2 in the case of conventional separation corresponds to the width of unbent edge 4, and thus used inefficiently. This distance is reduced by the arrangement according to the invention to z'.
Figure 2(a) illustrates a conventional pocket-separation 9 in which the width s of the weld-seams, and an additional tolerance and transition area ù, determine projection 5 and thus distance z.
As shown in Figure 2(b), a reduced distance z' ls obtained, according to the invention, by welding edge-projections 5 together and bending them in a single operation
Figure 2(a) illustrates a conventional pocket-separation 9 in which the width s of the weld-seams, and an additional tolerance and transition area ù, determine projection 5 and thus distance z.
As shown in Figure 2(b), a reduced distance z' ls obtained, according to the invention, by welding edge-projections 5 together and bending them in a single operation
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electrical accumulator having a porous separator which insulates the plates of an assembly of electrodes from each other and projects beyond the contour of the said plates characterized in that the laterally projecting edge-strips of the separator are bent through an angle of between 60° and 90°
so that the edge-strip covers at least the edge of each electrode.
so that the edge-strip covers at least the edge of each electrode.
2. An electrical accumulator according to claim 1, characterized in that the separator is made of a thermoplastic synthetic material.
3. An electrical accumulator according to claim 1, characterized in that the edge-strips are formed by profiled material made of a thermoplastic synthetic material applied to the material of the separator.
4. An electrical accumulator according to claim 1 or 2, characterized in that the separators are pockets for the accommodation of individual plates of one electrode polarity or the other, the lateral edge-strips thereof being bent over.
5. An electrical accumulator according to one of claims 1, 2 or 3, characterized in that the bent-over edge-strips of the separation overlap.
6. An electrical accumulator according to one of claims 1, 2 or 3, characterized in that the edge-strips are welded or glued together positively along their overlapping areas.
7. A method for producing an electrical accumulator according to one of claims 1, 2 or 3, characterized in that the edge-strip of the separator material projecting laterally beyond the contour of the plates is composed of a thermoplastic synthetic material which has been bent to form the edge-strip, or in that corresponding profiled strips made of a thermoplastic synthetic material, are fitted to the individual separators, and in that the overlapping areas of adjacent separators are welded or glued together.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3045479.6 | 1980-12-03 | ||
| DE3045479A DE3045479C3 (en) | 1980-12-03 | 1980-12-03 | Electric accumulator and process for its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1166307A true CA1166307A (en) | 1984-04-24 |
Family
ID=6118155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391384A Expired CA1166307A (en) | 1980-12-03 | 1981-12-02 | Electrical accumulator |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0053268A1 (en) |
| CA (1) | CA1166307A (en) |
| DE (1) | DE3045479C3 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0814530A1 (en) * | 1996-06-18 | 1997-12-29 | Alcatel | Electrochemical generator |
| DE19804423C1 (en) * | 1998-02-05 | 1999-05-27 | Vhb Industriebatterien Gmbh | Electrical lead-acid battery |
| KR20210074026A (en) * | 2019-12-11 | 2021-06-21 | 주식회사 엘지에너지솔루션 | Electrode assembly, manufacturing method and device of thereof |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1474761A (en) * | 1920-11-30 | 1923-11-20 | Thomas A Campbell | Secondary cell and separator plate for use therein |
| DE380047C (en) * | 1921-05-07 | 1923-09-01 | Hazelett Storage Battery Compa | Electric collector with pasted thin grid plates |
| US1772549A (en) * | 1927-11-23 | 1930-08-12 | Frank N Lloyd | Separator plate |
| FR832939A (en) * | 1937-05-28 | 1938-10-06 | Cie Reunies Glaces Et Verres | Spun glass separator for electric accumulators |
| GB540591A (en) * | 1940-06-22 | 1941-10-22 | Varley Dry Accumulators Ltd | Improvements in or relating to electric storage batteries |
| US2490630A (en) * | 1944-10-03 | 1949-12-06 | Electric Storage Battery Co | Storage battery plate and retainer construction |
| FR911284A (en) * | 1945-01-09 | 1946-07-03 | Separator for electric accumulator | |
| BE563483A (en) * | 1956-12-28 | |||
| JPS4940716U (en) * | 1972-07-12 | 1974-04-10 | ||
| DE2332546A1 (en) * | 1973-06-27 | 1975-01-09 | Grace Gmbh | BATTERY ELEMENT AND METHOD OF MANUFACTURING IT |
| FR2251921B1 (en) * | 1973-11-21 | 1977-09-30 | Fulmen | |
| US3989579A (en) * | 1975-02-27 | 1976-11-02 | Evans Products Company | Apparatus for forming envelopes |
| AU4897579A (en) * | 1978-07-18 | 1980-01-24 | Chloride Group Ltd. | Electric battery case |
-
1980
- 1980-12-03 DE DE3045479A patent/DE3045479C3/en not_active Expired - Fee Related
-
1981
- 1981-10-21 EP EP81108615A patent/EP0053268A1/en not_active Withdrawn
- 1981-12-02 CA CA000391384A patent/CA1166307A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3045479C3 (en) | 1994-11-24 |
| EP0053268A1 (en) | 1982-06-09 |
| DE3045479A1 (en) | 1982-07-01 |
| DE3045479C2 (en) | 1994-11-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |