Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer or spacer insulating structure
Patent
1981-03-04
1982-11-23
Skapars, Anthony
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer or spacer insulating structure
429146, H01M 218
Patent
active
043605761
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a lead accumulator which can be used, in particular, in traction batteries.
BACKGROUND OF THE INVENTION
In very simplified terms, an accumulator of this type comprises a plurality of elements each consisting of a negative plate, a positive plate and separating means intercalated between these plates.
The production of an accumulator of high energy-to-weight ratio, which is very durable, presents a fundamental technical problem. Thus, in particular, it is necessary to find a means of improving the efficiency of the active materials whilst at the same time preventing them from swelling and preventing the positive material from shedding; it is also necessary to reduce the corrosion of the grids holding these active materials.
The separating means of the accumulator play a very important part in improving all the abovementioned factors. Numerous types of separating means comprising microporous separators have already been proposed.
SUMMARY OF THE INVENTION
The object of the present invention is to produce a lead accumulator comprising microporous separators which are arranged so that they provide a distinct improvement from the point of view of durability.
The present invention relates to a lead accumulator which comprises a plurality of elements each consisting of a negative plate, a positive plate and separating means intercalated between these plates. The separating means consists of a first and a second microporous separator, between which spacers define channels. The invention is characterised in that the thickness of the channels is between 0.5 mm and 2 mm and in that the width of the channels is between 2 mm and 10 mm.
If the positive and negative plates of the accumulator have a height of between 100 mm and 300 mm, the thickness of the channels is preferably between 0.7 mm and 2 mm. If these plates have a height of between 300 mm and 600 mm, the thickness of the channels is preferably between 1 mm and 2 mm.
The width of the channels is preferably between 3 mm and 7 mm. These characteristics make it possible to obtain an accumulator of satisfactory energy-to-volume ratio, which has a longer life than the accumulators of the prior art.
According to a first embodiment, the spacers are produced by ribs present on one of the said separators. According to a preferred embodiment, the first separator, applied against the negative plate, comprises first ribs on its face turned towards the positive plate, and the said second separator, applied against the positive plate, comprises second ribs on its face turned towards the negative plate. The first and the second ribs are parallel to one another; the gap between two ribs on one and the same separator is between 5 mm and 20 mm. The two separators are preferably identical and the ribs on one separator bear on the other separator in the gap separating two of the ribs on the latter. The thickness of a rib is between 0.5 mm and 3 mm.
In all these variants, the channels, which are vertically orientated (in the normal use position of the accumulator), enable the electrolyte and the gases to circulate and thus enable the active materials to function homogeneously over the whole surface of the plates. Preferably, a device for forced circulation of the electrolyte is associated with the accumulator.
Furthermore, the faces of the first and the second separators which are respectively in contact with the positive and negative plates preferably possess mutually parallel grooves which are separated by a distance of between 0.8 mm and 1.4 mm and which allow the gases to be discharged more easily, in particular during recharging.
The separation can be filled by at least one glass wool sheet interposed between the second separator and the positive plate. The microporous separators or the glass wool sheets can be extended so as to surround the edges of the plates.
According to a particularly advantageous embodiment, the active material of the positive plates is consolidated by a plastic binder of the PTFE type, the pr
REFERENCES:
patent: 2004304 (1935-06-01), Wells
patent: 2422130 (1947-06-01), Proctor
patent: 2465493 (1949-03-01), Strickhouser et al.
patent: 2607810 (1952-08-01), Walker
patent: 2742521 (1956-04-01), Duddy
patent: 2909588 (1959-10-01), Rolph
patent: 2925456 (1960-02-01), Beusker et al.
patent: 3350484 (1967-10-01), Magill, Jr.
patent: 3898099 (1975-08-01), Baker et al.
patent: 4074021 (1978-02-01), Aronson
patent: 4245013 (1981-01-01), Clegg et al.
Marcellin Georges
Pascon Claude
Skapars Anthony
Societe Anonyme Dite: Compagnie Generale d'Electricite
LandOfFree
Lead accumulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lead accumulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lead accumulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1879359