Battery

摘要

A battery (20) comprises:
a metallic outer can (1);
a wound electrode group (2) accommodated in the outer can (1) in a direction perpendicular to a winding axis, wherein a wound positive electrode current-collecting tab (8a) is provided at one end of the wound electrode group (2), and a wound negative electrode current-collecting tab (9a) is provided at the other end of the wound electrode group (2);
a positive electrode-lead (3) connected to the positive electrode current-collecting tab (8a);
a negative electrode-lead (4) connected to the negative electrode current-collecting tab (9a);
a metallic lid comprising a positive electrode terminal (6) and a negative electrode terminal (7) and being attached to an opening portion of the outer can (1);
a positive electrode insulating cover (25) engaged with one end portion including the positive electrode current-collecting tab (8a) of the wound electrode group (2); and
a negative electrode insulating cover (26) engaged with the other end portion including the negative electrode current-collecting tab (9a) of the wound electrode group (2), wherein
the positive electrode-lead (3) comprises a connection portion connected to the positive electrode terminal (6) and first and second sandwiching portions that extend from the connection portion to the wound electrode group (2) in the direction perpendicular to the winding axis to sandwich the wound positive electrode current-collecting tab (8a),
the negative electrode-lead (4) comprises a connection portion connected to the negative electrode terminal (7) and first and second sandwiching portions that extend from the connection portion to the wound electrode group (2) in the direction perpendicular to the winding axis to sandwich the wound negative electrode current-collecting tab (9a),
the positive electrode insulating cover (25) comprises a U-shaped member (25a) 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 (3) and the wound positive electrode current-collecting tab (8a) portion that faces the first sandwiching portion and sandwich the second sandwiching portion of the positive electrode-lead (3) and the positive electrode current-collecting tab (8a) portion that faces the second sandwiching portion, and
the negative electrode insulating cover (26) comprises a U-shaped member (26a) 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 (4) and the wound negative electrode current-collecting tab (9a) portion that faces the first sandwiching portion and sandwich the second sandwiching portion of the negative electrode-lead (4) and the negative electrode current-collecting tab (9a) portion that faces the second sandwiching portion.