SE7810731L - Forfarande for tillverkning av elektrokemiska celler eller batterier - Google Patents

Forfarande for tillverkning av elektrokemiska celler eller batterier

Info

Publication number
SE7810731L
SE7810731L SE7810731A SE7810731A SE7810731L SE 7810731 L SE7810731 L SE 7810731L SE 7810731 A SE7810731 A SE 7810731A SE 7810731 A SE7810731 A SE 7810731A SE 7810731 L SE7810731 L SE 7810731L
Authority
SE
Sweden
Prior art keywords
electrochemic
batteries
cells
procedure
manufacture
Prior art date
Application number
SE7810731A
Other languages
English (en)
Inventor
J J P Leyen
Original Assignee
Electrochem Energieconversie
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Electrochem Energieconversie filed Critical Electrochem Energieconversie
Publication of SE7810731L publication Critical patent/SE7810731L/sv

Links

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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/543—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining more than two hollow-preforms to form said hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/42—Grouping of primary cells into batteries
    • H01M6/46—Grouping of primary cells into batteries of flat cells
    • H01M6/48—Grouping of primary cells into batteries of flat cells with bipolar electrodes
    • 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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2404—Processes or apparatus for grouping fuel cells
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H01M8/242—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes comprising framed electrodes or intermediary frame-like gaskets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3468—Batteries, accumulators or fuel cells
    • 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
    • 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
SE7810731A 1977-10-14 1978-10-13 Forfarande for tillverkning av elektrokemiska celler eller batterier SE7810731L (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7711288 1977-10-14

Publications (1)

Publication Number Publication Date
SE7810731L true SE7810731L (sv) 1979-04-14

Family

ID=19829342

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7810731A SE7810731L (sv) 1977-10-14 1978-10-13 Forfarande for tillverkning av elektrokemiska celler eller batterier

Country Status (11)

Country Link
JP (1) JPS5465338A (sv)
BE (1) BE871222A (sv)
CA (1) CA1129946A (sv)
CH (1) CH644228A5 (sv)
DE (1) DE2844695A1 (sv)
ES (1) ES474165A1 (sv)
FR (1) FR2406313A1 (sv)
GB (1) GB2006101B (sv)
IT (1) IT1109213B (sv)
NL (1) NL7810013A (sv)
SE (1) SE7810731L (sv)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2502850A1 (fr) * 1981-03-26 1982-10-01 Tregie Perfectionnement aux piles a combustible
JPS58103779A (ja) * 1981-12-16 1983-06-20 Meidensha Electric Mfg Co Ltd 積層電池の電極端板
JPS58157063A (ja) * 1982-03-12 1983-09-19 Mitsubishi Electric Corp 積層形燃料電池の製造方法
JPS6074359A (ja) * 1983-09-30 1985-04-26 Mitsui Eng & Shipbuild Co Ltd 電極反応装置
FR2568412B1 (fr) * 1984-07-27 1986-10-17 Occidental Chem Co Perfectionnements aux structures des piles a combustible.
GB2178223A (en) * 1985-07-18 1987-02-04 Int Fuel Cells Corp Polymeric molded frames for an alkali electrochemical cell
JPS62120265U (sv) * 1986-01-22 1987-07-30
JPS6372853U (sv) * 1986-10-30 1988-05-16
JPS63155265U (sv) * 1987-03-31 1988-10-12
JPH02133783U (sv) * 1989-04-11 1990-11-06
NL1014405C1 (nl) 2000-02-17 2001-08-20 Nedstack Holding B V Methode voor het vervaardigen Polymeer Elektrolyt Brandstofcellen.
GB0110920D0 (en) * 2001-05-03 2001-06-27 Morgan Crucible Co Flow field plates and a method for forming a seal between them
GB2380853A (en) * 2001-10-11 2003-04-16 Morgan Crucible Co Fuel cell or electrolyser construction
US7820336B2 (en) * 2006-10-05 2010-10-26 Dic Corporation Fuel cell bipolar plate, and fuel cell
CN113997574B (zh) * 2021-11-01 2023-07-18 南京工程学院 一种纤维增强热塑性树脂复合薄板超声波焊接方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1534904A (fr) * 1967-06-22 1968-08-02 Wonder Piles Perfectionnements aux piles électriques étanches
US3544383A (en) * 1968-12-16 1970-12-01 Esb Inc Method of sealing an electric battery by means of spin welding
GB1365483A (en) * 1970-11-21 1974-09-04 Lucas Industries Ltd Method of joining parts wherein one of the parts is formed of a porous hydrophobic non stick synthetic resin material
US3775189A (en) * 1972-02-25 1973-11-27 Gould Inc Forming sealed housings for electrochemical cells
GB1425030A (en) * 1972-07-05 1976-02-18 Lucas Batteries Ltd Method of joining a pair of parts
NL7509675A (nl) * 1975-08-14 1977-02-16 Stamicarbon Werkwijze voor het vervaardigen van een electro- chemische cel of batterij, bijvoorbeeld een brand- stofcel of brandstofcelbatterij en volgens deze werkwijze vervaardigde cel of batterij.

Also Published As

Publication number Publication date
DE2844695A1 (de) 1979-04-26
FR2406313B1 (sv) 1983-10-07
JPS5465338A (en) 1979-05-25
CH644228A5 (de) 1984-07-13
IT1109213B (it) 1985-12-16
JPS6244386B2 (sv) 1987-09-19
ES474165A1 (es) 1979-10-16
DE2844695C2 (sv) 1987-09-24
IT7851458A0 (it) 1978-10-11
FR2406313A1 (fr) 1979-05-11
GB2006101A (en) 1979-05-02
GB2006101B (en) 1982-03-24
BE871222A (nl) 1979-04-13
CA1129946A (en) 1982-08-17
NL7810013A (nl) 1979-04-18

Similar Documents

Publication Publication Date Title
NO793270L (no) Framgangsmaate for framstilling av silicium for solceller
SE7803398L (sv) Forfarande for framstellning av celltermoplaster
IL55866A0 (en) Manufacture of solar cells
SE7801766L (sv) Forfarande for beredning av en suspension av celler
SE7904676L (sv) Batteri med flera celler
FI783478A (fi) Foerfarande foer framstaellning av polymerisat av akrylsyra eller metakrylsyra
ES505484A0 (es) Procedimiento para la fabricacion de celulas solares de capade silicio
SE7810731L (sv) Forfarande for tillverkning av elektrokemiska celler eller batterier
AR225587A1 (es) Procedimiento para la fabricacion de celulas fotovoltaicas
NO771578L (no) Fremgangsmaate for fremstilling av di-n-propyleddiksyre
NO772897L (no) Fremgangsmaate ved fremstilling av olefiniske polymerer eller kopolymerer
SE404326B (sv) Forfarande for framstellning av cellfackverk och anleggning for genomforande av forfarandet
SE7709547L (sv) Forfaringssett for framstellning av separatorer for elektrokemiska celler
FI781221A (fi) Foerfarande foer bestaemning av obundna hormoner eller laekemedel
NL190091C (nl) Watervrije batterij of cel.
DK143477A (da) Fremgangsmade til dyrkning af celler
FI783335A (fi) Behandlingshuvud foer elektromedicinsk diagnostisk eller terapeutisk behandling av kroppsdelar
ES491349A0 (es) Procedimiento para la fabricacion de separadores de baterias
DK468080A (da) Fremgangsmaade til stabilisering af vandfri elektrokemiske celler
SE7811672L (sv) Forfarande for tillverkning av betredbara och/eller farbara plattor eller trappsteg, samt anordning for genomforande av forfarandet
SE7803131L (sv) Inglasning av solkollektorer
DK238180A (da) Forbedrede celler til blyakkumulatorer og fremgangsmaade til fremstilling af saadanne celler
NO791599L (no) Fremgangsmaate for fremstilling av dibenzyletere
SE7806197L (sv) Cellforbindning for elektrolytiska celler
DK90979A (da) Fremgangsmaade til fremstilling af gitre til blybatteriroerplader