| abstract |
A wound electrode body including a band-shaped positive electrode having a positive electrode lead, a band-shaped negative electrode having a negative electrode lead, and a band-shaped separator provided between the positive electrode and the negative electrode, and an electrolytic solution were housed in a case. In the battery, the electrode body is a battery in which a positive electrode lead and a negative electrode lead are derived from one end face and have a separator molded portion protruding from the other end face so as to satisfy the formulas 1 and 2. (Equation 1 0.08 ≤ W2 / Ws ≤ 0.17) (Equation 2 0.20 ≤ W4 / W2 ≤ 0.53) In Equations 1 and 2, W1 is the amount of protrusion of the separator on one end face side from the negative electrode, W2 is the amount of protrusion of the separator on the other end face side from the negative electrode, and Ws is the width of the separator. , W4 are dimensions from the end of the negative electrode to the bottom of the electrode body (excluding the thickness of the tape). Figure 3 |