Button battery shell and button battery

A button battery shell, comprising:

• a positive electrode metal end cover and a negative electrode metal end cover, wherein the positive electrode metal end cover comprises a first bottom cover and a first surrounding wall provided around one side of the first bottom cover, and the negative electrode metal end cover comprises a second bottom cover and a second surrounding wall provided around one side of the second bottom cover;
• wherein the positive electrode metal end cover and the negative electrode metal end cover are arranged opposite to each other so that an end portion of the first surrounding wall and an end portion of the second surrounding wall are oppositely arranged at an interval, a first insulating sleeve is arranged on the first surrounding wall, a second insulating sleeve is arranged on the second surrounding wall, the first insulating sleeve and the second insulating sleeve are connected at a connection surface to form an insulating shell having an integrated structure, and the insulating shell, the positive electrode metal end cover and the negative electrode metal end cover form an accommodating cavity for accommodating a battery cell;
• wherein the first surrounding wall comprises a first annular wall and a second annular wall connected sequentially in a direction away from the first bottom cover, the first annular wall and the second annular wall are coaxial;
• and the second surrounding wall comprises a third annular wall and a fourth annular wall connected sequentially in a direction away from the second bottom cover, the third annular wall and the fourth annular wall are coaxial;
• wherein inner diameters of the first annular wall and the third annular wall are equal;
• wherein a portion of the first insulating sleeve arranged on the inner side of the first surrounding wall coincides with an inner diameter annular surface of the first annular wall;
• wherein a portion of the second insulating sleeve arranged on the inner side of the second surrounding wall coincides with an inner diameter annular surface of the third annular wall.