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).
Letter discussing the charging and discharging of battery cells, including a postscript about adding oil to the electrolyte.
| Identifier | ExFiles\Box 61\1\ scan0021 | |
| Date | 27th March 1924 guessed | |
| -2- Contd. charged very efficiently when they are charged at a low rate ? Our impression has always been that the ampere hour efficiency of a charge (provided the cells have not arrived at the gasing condition) would be greater the lower the rate of charging. We could keep the cells on an average in a more or less fully charged condition, or in a half charged condition, whichever is considered desirable, but the general function of the cells is to act very much in the same way as a buffer battery such as might be used on a tramway system, which will at one moment be charging and at the next moment discharging, according to the tram load at the instant. We shall be pleased to have your remarks on these points. We may say that the first charge has been given precisely according to instructions, and after having discharged the cells we have charged up again, and are to-day giving the cells a further overcharge to give them a good send off. In order to prevent unnecessary overcharging, we have means of discharging, which can be applied when desirable. Yours faithfully, FOR ROLLS-ROYCE LIMITED. P.S. We think your Mr. Minchin suggested that we should have some oil to cover the electrolyte in the cells. This we should be pleased to have, if it is your intention, especially as the cells are located near apparatus. | ||