Back to results
US 2026/0280050 A1Published application
Secondary battery
AssigneePanasonic Energy Co., Ltd.
InventorKei Tanigawa
Life of this patent
Estimating the term…
Abstract
A cylindrical battery comprises an electrode body that includes a positive electrode, a negative electrode, and a separator, the positive electrode and the negative electrode being wound with the separator interposed therebetween. The separator has a folded-back portion that is formed more toward the winding center side than the winding start end portion of the positive electrode, and an extended portion that extends from the folded-back portion to the winding end side of the electrode body and covers the winding start end portion of the positive electrode from both sides.
Claims2
A secondary battery, comprising:
- an electrode assembly including a positive electrode, a negative electrode, and a separator, wherein the positive electrode and the negative electrode are wound with the separator interposed between the positive electrode and the negative electrode, wherein
- the separator has a folded-back portion formed closer to a winding center than a winding start-side end portion of the positive electrode, and an extension portion extending from the folded-back portion toward a winding end side of the electrode assembly to cover the winding start-side end portion of the positive electrode from both sides.
Dependencies are inferred from the claim text.