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).
Battery cell failures, comparing the effects of mechanical vibration and incorrect electrical treatment.
| Identifier | WestWitteringFiles\G\August1921\ Scan48 | |
| Date | 12th August 1921 | |
| Contd. -3- EFC1/T12.8.21. This fact, together with the fact that we have, on cells with elements insufficiently separated, experienced failures by buckling and shorting when the cell has done nothing but stationary work, would appear to show that mechanical vibration is much less detrimental to a mechanically well-constructed battery than incorrect electrical treatment. On the other hand, one cannot help but suppose that with a combination of the two, a cell failure must necessarily be accelerated by the influence of mechanical vibration. It appears that if a new battery is taken through this test, the number of charges and discharges through which it is taken would have to be very much greater than in the present case, or than would have been in the present case if the battery had not first failed externally. Since writing the above, we have examined the condition of a single cell which, for 18 weeks, has been undergoing (stationary) a course of alternate overcharges and discharges, the amount of each discharge being about .3 of the rated capacity in ampere-hours, and each charge being carried on for several hours after the cell would normally be considered fully charged. Contd. R.R. 235A (100 T) (S.H. 159 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 | ||