Battery with wound electrode group and positive and negative electrode insulating covers

摘要

According to one embodiment, there is provided a battery. The battery includes a metallic outer can, a wound electrode group, a positive electrode-lead, a negative electrode-lead, a positive electrode insulating cover, and a negative electrode insulating cover.

主权项

1. A battery comprising:
a metallic outer can; a wound electrode group accommodated in the outer can in a direction perpendicular to a winding axis, wherein a wound positive electrode current-collecting tab is provided at one end of the wound electrode group, and a wound negative electrode current-collecting tab is provided at an other end of the wound electrode group; a positive electrode-lead connected to the positive electrode current-collecting tab; a negative electrode-lead connected to the negative electrode current-collecting tab; a metallic lid comprising a positive electrode terminal and a negative electrode terminal and being attached to an opening portion of the outer can; a positive electrode insulating cover engaged with one end portion including the positive electrode current-collecting tab of the wound electrode group; and a negative electrode insulating cover engaged with the other end portion including the negative electrode current-collecting tab of the wound electrode group, wherein the positive electrode-lead comprises a connection portion connected to the positive electrode terminal and first and second sandwiching portions that extend from the connection portion to the wound electrode group in the direction perpendicular to the winding axis to sandwich the wound positive electrode current-collecting tab, the negative electrode-lead comprises a connection portion connected to the negative electrode terminal and first and second sandwiching portions that extend from the connection portion to the wound electrode group in the direction perpendicular to the winding axis to sandwich the wound negative electrode current-collecting tab, the positive electrode insulating cover comprises a U-shaped member that has first and second sidewalls facing each other, a back surface member, and a sandwiching member configured to sandwich the first sandwiching portion of the positive electrode-lead and the wound positive electrode current-collecting tab portion that faces the first sandwiching portion and sandwich the second sandwiching portion of the positive electrode-lead and the positive electrode current-collecting tab portion that faces the second sandwiching portion, the positive electrode insulating cover comprises a rectangular protruding portion that is provided on the back surface member and that is located in a hollow of the wound positive electrode current-collecting tab, the negative electrode insulating cover comprises a U-shaped member that has first and second sidewalls facing each other, a back surface member, and a sandwiching member configured to sandwich the first sandwiching portion of the negative electrode-lead and the wound negative electrode current-collecting tab portion that faces the first sandwiching portion and sandwich the second sandwiching portion of the negative electrode-lead and the negative electrode current-collecting tab portion that faces the second sandwiching portion, and the negative electrode insulating cover comprises a rectangular protruding portion that is provided on the back surface member and that is located in a hollow of the wound negative electrode current-collecting tab.