Patent ID: 7851083

Claim:
A lithium ion secondary battery comprising: an enclosure having a first compartment and a second compartment, wherein said first compartment and said second compartment each have an opening and wherein said openings are on the same side of the enclosure; a first cover for sealing said first compartment; a second cover for sealing said second compartment; a protection circuit; an electrode core; and terminal leads wherein the positive and negative electrodes of said electrode core are connected to said protection circuit by said terminal leads; wherein said first cover and said second cover are separate pieces; wherein said enclosure is made of a first non-conducting material; said first compartment holds said protection circuit; and said second compartment holds said electrode core; wherein a seal is maintained between the first compartment and the second compartment; and wherein a seal is maintained between the first compartment and the second compartment by fusing a pre-fabricated terminal lead.