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).
Page discussing the diagnosis and faults of accumulator (battery) plates.
| Identifier | ExFiles\Box 44\5\ Scan022 | |
| Date | 2nd December 1927 guessed | |
| -3- Contd. restore them to their correct condition. If you are partially lax in these respects you will find that it is the negative plates which mainly suffer and that an abnormal amount of charging (at correct rate) will be necessary to make the negative plates gas freely. This undue amount of charging will, by super-peroxidation of the positive grids, render them weak mechanically, so that they will the more easily lose their paste and even fall to pieces, though otherwise, e.g. electrically, O.K. If, in any cell on charge, the negative plates do not gas easily as soon as the positives, it indicates that at some time the battery has been wrongly treated in respect of one or the other of the items above. If plates have to be removed from electrolyte, special treatment, not detailed here, is necessary. Otherwise, apart from fault separation, the battery will continue to function satisfactorily with slowly diminishing capacity until the normal amount of charge, repeatedly carried out, has resulted in sufficient deposition mainly from the positive plates to pile up the space underneath the plates and produce a short circuit. Remember that an accumulator cell consists of two independent things, a set of positive plates in the electrolyte and a set of negative plates in the electrolyte, and each of these must be separately right (see Notes on Accumulator Element Condition and Notes on Cadmium Test). | ||