NON-AQUEOUS ELECTROLYTE WOUND TYPE SECONDARY BATTERY

摘要

A method of simultaneously preventing expansion of a battery can and distortion of an electrode winding body is disclosed. A non-aqueous electrolyte wound type secondary battery includes an electrode winding body including a positive electrode sheet, a negative electrode sheet and a separator between the positive electrode sheet and the negative electrode sheet, a support member which is inside the electrode winding body and around which the electrode winding body is wound, and a battery can which contains the electrode winding body and the support member. The positive electrode sheet includes a positive electrode layer and a positive electrode lead part. The negative electrode sheet includes a negative electrode layer and a negative electrode lead part. An inside of a corner of the electrode winding body is supported by the support member. A gap is provided inside the lead part of the electrode winding body and inside the support member.

主权项

1. A non-aqueous electrolyte wound type secondary battery comprising:
an electrode winding body including a positive electrode sheet, a negative electrode sheet and a separator formed between the positive electrode sheet and the negative electrode sheet; a support member which is formed inside the electrode winding body and around which the electrode winding body is wound; and a battery can which contains the electrode winding body and the support member, wherein the positive electrode sheet includes a positive electrode layer and a positive electrode lead part, the negative electrode sheet includes a negative electrode layer and a negative electrode lead part, an inside of a corner part of the electrode winding body is supported by the support member, a gap is provided inside the lead part of the electrode winding body and inside the support member, in the lead part of the electrode winding body, the positive electrode lead part or the negative electrode lead part includes a bent part, and the bent part is formed between a side of the support member in a direction perpendicular to a winding axis direction of the electrode winding body and an electrode facing part of the electrode winding body.