Sealing plate for prismatic secondary battery and prismatic secondary battery using the sealing plate

A prismatic secondary battery comprising:

• a prismatic hollow outer body having a mouth and a bottom;
• an electrode assembly including a positive electrode sheet and a negative electrode sheet;
• a positive electrode collector electrically connected to the positive electrode sheet;
• a negative electrode collector electrically connected to the negative electrode sheet;
• an electrolyte;
• a sealing assembly sealing up the mouth of the prismatic outer body, the sealing assembly having a long side and a short side, the sealing assembly including
• a positive electrode terminal electrically connected to the positive electrode collector,
• a negative electrode terminal electrically connected to the negative electrode collector,
• a first region having a flat surface,
• a second region,
• a third region, and
• a gas release valve provided between the positive electrode terminal and the negative electrode terminal in a direction parallel to the long side of the sealing assembly;
• and
• an identification code formed on the flat surface of the first region,
• wherein the identification code is spaced from the gas release valve, in the direction parallel to the long side of the sealing assembly and provided between the second region and the third region in a direction parallel to the short side of the sealing assembly,
• wherein the second region and the third region are farther from the bottom than the first region;
• wherein the sealing assembly includes a sealing plate,
• wherein the first region is a part of the sealing plate,
• wherein the identification code is formed on the sealing plate, and
• wherein the sealing plate is directly connected to the prismatic hollow outer body by welding.