Battery pack and method of disassembling the battery pack

A battery pack comprising:

• a tray comprising a peripheral portion;
• a cover covering the tray and comprising a peripheral portion that faces the peripheral portion of the tray;
• a connection member connecting the peripheral portion of the tray and the peripheral portion of the cover to each other with a clearance provided between the peripheral portion of the tray and the peripheral portion of the cover;
• and
• a sealant filling the clearance,
• wherein
• the connection member comprises a spacer disposed in a range between the peripheral portion of the tray and the peripheral portion of the cover in a direction along which the tray and the cover are stacked,
• the spacer comprises a first portion having a first cross-sectional area in a cross section of the spacer along a plane parallel to the clearance, a second portion having a second cross-sectional area in a cross section of the spacer along a plane parallel to the clearance, and a third portion having a third cross-sectional area in a cross section of the spacer along a plane parallel to the clearance,
• the second cross-sectional area is smaller than the first cross-sectional area and the third cross-sectional area,
• the first portion is disposed at a position that is in contact with the peripheral portion of the tray,
• the third portion is disposed at a position that is in contact with the peripheral portion of the cover, and
• the second portion is disposed between the first portion and the third portion.