Battery pack

A battery pack, comprising:

• a plurality of battery cells arranged side by side along a first direction;
• and
• a case having an inner space accommodating the plurality of battery cells, wherein the case includes:
• a first member,
• a second member that forms the inner space together with the first member, and
• a sealing portion that seals a joining portion between the first member and the second member,
• the first member and the second member are joined with each other in a second direction orthogonal to the first direction by the sealing portion without another fastening member other than the sealing portion,
• the first member has:
• a cover portion extending along a plane orthogonal to the second direction, and
• a first portion in abutment with the sealing portion,
• the second member has:
• a bottom portion extending along the plane, and
• a second portion facing the first portion, with the sealing portion being interposed between the second portion and the first portion,
• the first portion and the second portion constitute a side wall portion that connects the cover portion and the bottom portion,
• the first portion and the second portion face each other in a direction orthogonal to the second direction,
• the case is configured to, in response to an expansion pressure of the inner space acting on the case, cause a force in a shearing direction to act on the sealing portion sandwiched between the first portion and the second portion, and
• a tip of the first portion is inclined in a direction away from the second portion.