Patent ID: 7701169

Claim:
A lithium secondary battery with a built-in protective circuit, comprising: a battery case ( 1 ); and a battery core ( 2 ) including a positive electrode plate, a separator and a negative electrode sheet being overlapped one by one, electrolyte, and a built-in protective circuit module ( 4 ) to act as an internal connection to the terminals of positive and negative electrodes and to detect and control the over-charge, over-discharge and over-current of the battery, wherein the protective circuit module ( 4 ) includes an integrated circuit (“IC”) and a field effect transistor (“FET”), and the lithium secondary battery with a built-in protective circuit has three feet ( 411 ), ( 412 ) and ( 421 ) which are connected with a terminal and the output end of one electrode, a terminal and output end of another electrode of the battery respectively, and the FET is electrically connected with feet ( 412 ), ( 421 ) and the integrated circuit.