Flat battery
A flat battery is an original by Paul Schmidt developed battery , are connected in series in the three cells in series. Usually these are zinc-carbon cells with a voltage of 1.5 V each ; in this case the IEC designation of this battery is 3R12 . If alkaline manganese cells are used, the designation is 3LR12 . The positive pole is on the short connecting tongue, the negative pole is correspondingly on the long tongue.
The series connection results in a total voltage of 4.5 V. Flat batteries cannot be recharged .
meaning
The flat battery is becoming less and less important, partly because of its bulkiness; Most of their areas of application can also be served by Mignon batteries (AA) thanks to energy-saving technologies that require a lower voltage .
In many cases, flat batteries are no longer commercially available. Using an adapter (for three Mignon batteries), old devices can still be operated (but with a reduced capacity, as Mignon batteries have a significantly smaller volume than the cells normally found in flat batteries). This is also the only way to use rechargeable NiCd or NiMH batteries in corresponding devices, since neither batteries nor suitable chargers exist for the flat battery.
Areas of application
Commercial use
Flat batteries are still used today by various manufacturers (including Crone , Duracell , Panasonic , Varta ) in box lights (box-shaped flashlights ). The advantage is the portability (only one instead of three batteries must be installed), and in the increased current capacity due to better use of space (m approx 5900 Ah instead of 2,200 to 3,500 mAh in AA, see battery sizes ). They were also found in transistor radios until the early 1970s . Analog resistance measuring devices also got their energy requirements partly from flat batteries.
Handcraft
The flat battery is traditionally used for smaller handicraft projects in handicraft lessons or in children's groups because of the long connection lugs that can be easily contacted . In the context of electricity theory , it is used to build simple electrical circuits . In some cases, the 4.5 V voltage saves the need for a complex series connection of other (radially symmetrical) battery types. Due to their spring action, the connection lugs often serve as switches , so that a simple flashlight can be quickly made with a light bulb and some adhesive tape . A series (higher voltage ) or parallel connection (higher amperage ) of several flat batteries is achieved by connecting the connection lugs appropriately (in the simplest case with paper clips ). Due to the decreasing market presence of flat batteries, the 9-volt block is becoming more and more popular for handicraft tasks .
photos
Disassembled flat battery
Battery adapter: Three Mignon batteries (AA) become one flat battery
Opened box light with flat battery
literature
- David Linden, Thomas B. Reddy (Eds.): Handbook of Batteries . 3. Edition. McGraw-Hill, New York 2002, ISBN 0-07-135978-8 (English).
