IL32805A - A separator for lead-acid secondary batteries - Google Patents

Description

A separator for secondary batteries EZRA VITTORIO PICCIOTTO 31024 Invention is concerned with improved separators keeping positive plates apart from negative plates in secondary Known separators generally consist of a shielded cellulose or other material resisting to ae or ribbed Such known separators have a number of such easy low resistance to temperatures over low or no retention of active material fallin from positive plates during the life and sensitivity to British Patent Specification discloses separators in bag form made of a fabric of a particular structure which may be made of vinyl polymers and separators obviate the drawbacks of prior According to the there provided a separator for the plates of a secondar shaped as an envelope a flattened tubular hose closed at its transversal opposed sides and adapted to enclose one alternate plate of the battery element so as to be equivalent to two conventional separators and constituted by modacryllc the envelope has a labyrinthic structure formed from the envelope comprises a hose closed at two transversal opposed sides and thermally shrunk and hardened so that it encloses the positive plate of the delimiting channels for escape of reaction gases from the 3 In to promote a fuller understanding of the above and other aspeots of the present an embodiment will now be by way of example with reference to the accompanying in which 1 is an exploded perspective view of part of a battery provided with separators according to the 2 is a sectional partial view taken along the line of the battery illustrated in 3 is a perspective view of a separator according to one embodiment of the enveloping and embodying a positive 4 is a perspective view of a separator according to another embodiment of the enveloping and embodying a positive With reference to 2 and a separator 10 according to the present invention is shaped as an envelope closed along its three sides 12 and It consists of a material resistant to and is formed by a labyrinthic interlacement of filaments to which a binding resin which is also resistant to the chemical action of has been It is clear from 2 that each separator is equivalent to two conventional The material used for the separator presents a fibrous structure and consists of a modacrylic 15 and 16 indicate compartments of a battery container 17 which define cells of a Bridges 18 and 19 on extensions 22 of positive plates 30 and negative plates 31 respectively end with poles 21 and According to the embodiment of the invention in the separator consists of a sheath 10a formed from the tubular sheath 10a are transversally joined at 24 and 25 so that the sheath 10a embodies a positive plate 30 of the battery The separator is formed from modacryilc filaments and a thermal treatment is carried out in order to shrink and harden the modaerylic filaments to ensure that the separator fits the The so processed tubular hose presents a corrugated by the wales and courses in a horizontal and this is favourable to ascensional flow of reaction gases from the In the upper edges of the envelope are higher than the adjacent edge of the positive plate surrounded by the envelope so that transfer of lead sulphate between the positive plate and the adjacent negative plate is Each 10 has a labyrinthio structure giving it microporous and elastic it has a resistance to a feature of great importance batteries subject to continuous vibrations such as those used in The separator according to the invention is felectrically and thermally insulating and resistant to without limit of time and even to prolonged exposure to temperatures higher than those at which the positive plates If a fibrous structure is used as in the enveloping separators of outflow of reaction gases from the plate is secured through the microporous walls of the The advantages presented by the preferred separators according to this invention are as Short circuits oaused disintegration of the plates are prevented as the separators adhere to the surfaces of the negative and positive The whole surface of the plates is in permanent contact with even if the acid level falls below the upper edges of the plates as the separators are hydrophilic Easier flowing of the electrolyte to the plates eve in cold when it tends to become as the separator material has a Good efficiency of the battery even at high temperatures since the separator without temperatures higher than Elimination of space 33 usually provided in the bottom part of the battery container for collection of active material falling from the battery since erred separators according to the invention prevent the fall of the active positive and negative plates of larger surface than usual may be used with consequent power gain for the Power gain can also be obtained by using more plates in battery elements of conventional design owin to compressibility of these Alternatively it is possible to manufacture a smaller battery having the same as a larger conventional High thermal giving safe and efficient starting of motors even at very low Possibility of reduction of periodical feeds of distilled due to the hydrophilic properties Introduction of the plates into the separatore according to the invention by means of an automatic enveloping machine of a conventional design with the elimination of waste due to unbreakability of these insufficientOCRQuality

Claims (1)

1. A separator for the plates o a secondary shaped as an envelope formed of a flattened hose closed at its two transversal opposed sides and adapted to enclose one alternate plate of the battery element so to be equivalent two conventional separators and constituted by separator as claimed in Claim in which the envelope has a structure formed o A separator as in Claim in which envelope comprises a tubula knitted hose closed at its transversa opposed sides and thermally shrunk and hardened to enclose a positive plate of the the courses of the constituting vertical ridges which delimiting for escape of reaction gases from the A separator for the plates a secondary battery substantially as hereinbefore described with reference to the accompanying For the Applicant insufficientOCRQuality