From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Specifications for battery sealing compound and plate grid design.
| Identifier | WestWitteringFiles\M\2October1924-December1924\ Scan58 | |
| Date | 8th March 1924 guessed | |
| -4- Contd. (12) SEALING COMPOUND. The cells should be sealed over their tops only, with the exception that the sealing compound should be allowed to run down between the centre cells where the bicycle spokes are situated, so as to cover these up and protect them from acid. The compound with which the cells are sealed should be carefully chosen not to run down into the cells at 100°F.{Mr Friese}, and not to be too brittle at the low temperatures likely to be experienced. (13) PLATE GRIDS. Amplifying the remark re grids contained in (4), the outer periphery of the grid should be substantial enough to prevent this being eatend through and caused to break by overcharging. Further, the design of the grid frame-work should be such as to hold paste in place in the best possible way. It is desired to make it clear that, in making provision for this, in the case of a chassis battery, a certain amount of electrical efficiency must be given over to the more important feature of durability. An important thing on the chassis battery is to provide durability against combined vibration and overcharging. The grids should have rounded corners and the positive and negative plates should be provided with pairs of feet, those of the positive grids being out of line with those of the negative. The plates should rest by means of their feet on four ribs in the bottom of the cell case, in such a manner that positive plates rest on one pair of ribs and negative plates on the other, or some other means may be adopted to secure a similar result, such as the provision of depressions in the bottom peripheries of each set of plates, arching over each of the pair of supporting ribs, supporting the other set of plates. (Incidentally this method would secure slightly larger active surface than the feet method). The object of this feature is to prevent short circuits by the accumulation of sediment on the supporting ribs. Contd. | ||