The present invention relates to a lithium secondary battery with a
built-in protective circuit, which includes battery case (1), a battery
core (2) and electrolyte. According to the present invention, a built-in
protective circuit module (4) is provided to act as the connection
between terminals of positive and negative electrodes (21 and 22) and
output ends of positive and negative electrodes (31 and 32) inside the
battery. The battery of the present invention has the advantages of safe
and reliable protection against short-circuit, over-charge,
over-discharge and over-current in the application, and therefore it is
reliable power supply for the portable electronic appliances such as
mobile phones and the like.