NOVELTY - The battery has an insulating tape (35) arranged on outermost circumference of electrode group (2). A first insulating cover (36) has a resin molded product with a shape which covers areas of positive electrode lead (3) and positive electrode tab which are areas opposed to inside surface of a case (1). A second insulating cover (37) has a resin molded product with a shape which covers areas of negative electrode lead (4) and negative electrode tab which are areas opposed to inside surface of case.    USE - Battery e.g. rectangular secondary battery for electronic instrument e.g. portable telephone, personal computer.    ADVANTAGE - Improves energy density of the battery e.g. rectangular secondary battery since short width of tab is kept smaller by keeping the slurry-applied width of area larger. Obtains battery with good current collecting balance since battery has connecting sections at positions distributed substantial evenly to respective halves of the circumference of wound-state electrode section in which active material is held of each of the positive and negative electrodes and current collecting distance is made short accordingly. The battery has electrically and mechanically reliable structure since no other connection is disposed from the connection between the positive or negative electrode terminal and one of the leads to connection between the lead and nipping member. The ultrasonic welding is easily attained since ultrasonic welding horns or anvils are certainly inserted and arranged in the spaces when positive and negative electrode leads are welded to the taps by ultrasonic welding. Allows formation of good lead-connecting sections since tab does not directly receive the amplitude energy of ultrasonic waves and tab is not melted to be torn off or scattered by nipping the sheet-like portions of each of the taps by first or second nipping section and performing the ultrasonic welding. Provides battery with structure in which electrode group, tabs and leads are electrically insulated from case, and is high in volume efficiency. Prevents increase in the volume of insulating members and bad effect onto battery-downsizing, and further improves the battery capability of being impregnated with electrolytic solution to make the productivity of batteries high since number of insulating members to be used is made small. The cover contributes to decrease in costs since number of components to be used is reduced. Improves insertion easiness of electrode group into the case since first and second insulating covers protect the ultrasonic-welded sections. Prevents rupture of the battery when pressure in the case reaches standard value or more since groove is broken by pressure so that gas is released outside through the broken site.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the battery.    Case (1)    Electrode group (2)    Positive electrode lead (3)    Negative electrode lead (4)    Insulating tape (35)    First insulating cover (36)    Second insulating cover (37)