Patent ID: 7458996

Claim:
A process for producing a rechargeable lithium battery, comprising the steps of: providing a battery main body comprising at least a cathode, an anode, and an ion conductor, a first sealing member (a) having a concave portion with a peripheral portion surrounding said concave portion and a peripheral collar portion (a-i) at said peripheral portion of said concave portion, and a second sealing member (b) having a peripheral collar portion (b-i) at a region thereof which is corresponding to said peripheral portion of said first sealing member (a); arranging said battery main body in said concave portion of said first sealing member (a); mating said first sealing member (a) with said second sealing member (b) to oppose to each other such that the face of said concave portion of said first sealing member (a) is faced to said second sealing member (b) through said battery main body; and mutually welding said collar portion (a-i) of said first sealing member (a) and said collar portion (b-i) of said second sealing member (b), wherein said concave portion is shaped to have a cross-section in a substantially symmetrical trapezoidal form, and a side face of said concave portion has an inclination angle of 5° to 45° from a vertical axis, and wherein the first and second sealing members are provided prior to arranging said battery main body in said concave portion.