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

摘要

A prismatic secondary battery includes a prismatic hollow outer body having a mouth and a bottom; a flat electrode assembly, a positive electrode collector, a negative electrode collector, and an electrolyte, all of which are stored in the prismatic outer body; a sealing plate sealing up the mouth of the prismatic outer body; and a positive electrode terminal attached to the sealing plate in an electrically insulated manner. The sealing plate includes a gas release valve and an electrolyte pour hole and further includes, on the front face, a concaved flat face having an identification code. With the prismatic secondary battery of the invention, a jig for assembly or the like is unlikely to come into contact with the identification code during an assembly process of the prismatic secondary battery, hence the identification code is unlikely to be abraded, and the traceability is unlikely to be lost.

主权项

1. 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, and an electrolyte, all stored in the prismatic outer body; a sealing plate sealing the mouth of the prismatic outer body, the sealing plate having a long side and a short side; and a positive electrode terminal and a negative electrode terminal, both attached to the sealing plate, electrically connected to the positive electrode collector and the negative electrode collector, respectively, a gas release valve and an electrolyte pour hole provided between the positive electrode terminal and the negative electrode terminal, the sealing plate including a front face having a concaved flat face and an identification code formed on the concaved flat face; wherein the sealing plate is a member connected to the prismatic outer body by welding, and wherein an entirety of the concaved flat face is spaced from an entirety of the gas release valve, in a direction parallel to the long side of the sealing plate.