circuit inside nokia battery

[grittinjames]

nokia battery circuit

hai

i opened a nokia battery recently. i found a circuit wired up with an ic

wt it for any idea?

 

[wolly]

inside nokia batteries

most battery packs whith chip inside are used for monitoring temprature,voltage,charge etc to make it 'smart'.
just search datasheet of the chip and you will have a better idea why its being used for.

 

[surfman]

In this case IC is for short circuit protection

 

[kender]

At a minimum, it's a circuit that protects the Lithium cell from overheat, overvotage and overcurrent. It also (more importantly) protects the battery manufacturer from law suits. Here's a thread, where such protection circuits were discussed: