Nokia Mobile Phones Limited

Nokia Corporation

Nokia Technologies Oy

Jari Astala

Mika Kanninen

Jussi Hovi

Nina Nummentalo

The protection circuit () comprises at least one switch (FET, FET) comprising at least one control means (G, G) for adjusting the conductivity of said at least one switch (FET, FET). The conductivity is arranged to be adjustable by means of an electrical control conducted to the control means (G, G). The protection circuit () comprises means () for forming the electrical control, means () for measuring at least one physical quantity affecting at least one switch (FET, FET), means () for providing information about the dependence of the conductivity properties of said at least one switch (FET, FET) on said at least one physical quantity, means () for determining the conductivity of said at least one switch (FET, FET) on the basis of said at least one physical quantity and the conductivity properties of said at least one switch (FET, FET) and means () for determining the current (I) conducted through said at least one switch (FET, FET) at least partly on the basis of said conductivity. Thus, said electrical control is arranged to be formed at least partly on the basis of the determined current.

Method and apparatus for protection of batteries

A battery pack for use with a cellular telephone device includes a flat battery cell assembly encased by a resin using low temperature molding techniques or injection molding techniques under low pressure. An interface assembly cap provides an electrical connection means between the cell assembly and the cellular telephone device with which it is used. The resin molded cell assembly accommodates a smaller physical size than preformed plastic battery packs without sacrificing relative available power density.

Battery pack for electronic device

The invention relates to a protection circuit ( ) which includes at least one switch (FET , FET ) including at least one control means (G , G ) for adjusting the conductivity of the at least one switch (FET , FET ). The conductivity is arranged to be adjustable by means of an electrical control conducted to the control means (G , G ). The protection circuit ( ) includes means ( ) for forming the electrical control, means ( ) for measuring at least one physical quantity affecting at least one switch (FET , FET ), means ( ) for providing information about the dependence of the conductivity properties of the at least one switch (FET , FET ) on the at least one physical quantity, means ( ) for determining the conductivity of the at least one switch (FET , FET ) on the basis of the at least one physical quantity and the conductivity properties of the at least one switch (FET , FET ) and means ( ) for determining the current (I ) conducted through the at least one switch (FET , FET ) at least partly on the basis of the conductivity. Thus, the electrical control is arranged to be formed at least partly on the basis of the determined current.

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Tampere, Finland

Jari Astala