Battery module

A battery module where a plurality of assembled battery blocks are accommodated in an exterior case formed in an approximately hexahedral shape, each assembled battery block including a plurality of cylindrical unit cells electrically connected such that polarities thereof are alternating, and mechanically arranged in parallel, wherein the exterior case has a lower lid having a front face, a bottom face and a back face, and an upper lid having a left side face, an upper face and a right side face, end portions of the left side face, the upper face and the right side face of the upper lid being drawn at sides of the front face and the back face of the lower lid, and wherein the lower lid and the upper lid are fixed such that first flange portions extending from a bottom face portion of the lower lid laterally correspond to second flange portions extending from left and right side faces of the upper lid laterally, end portions of the first flange portions being bent upwardly and having a waveform shape,

• wherein positive and negative electrode output line taking-out ports are provided at the front face of the exterior case, and end portions of the left side face, the upper face, and the right side face of the upper lid are bent inwardly at substantially all of the edges of the sides of the front face and the back face of the lower lid to increase a bearing force of the exterior case against twisting.

A battery module, comprising:

• an exterior case formed in an approximately hexahedral shape;
• and
• a battery block which is accommodated in the exterior case and which is constituted by a plurality of cylindrical unit cells, each of which has positive and negative polarities at opposite ends,
• wherein the exterior case has a lower lid having three faces including a front face, a bottom face and a back face and an upper lid having three faces including a left side face, an upper face and a right side face, and is formed by combining the lower lid and the upper lid,
• and wherein the battery block is constituted by an assembled unit of said plurality of assembled cylindrical unit cells arranged mechanically parallel to one another such that said positive and negative polarities of said unit cells are alternating and are fixedly arranged mutually adjacent and are electrically connected to one another, the battery block being fixedly put on the lower lid in a state of the assembled unit,
• wherein positive and negative electrode output line taking-out ports are provided at the front face of the exterior case, and end portions of the left side face, the upper face, and the right side face of the upper lid are bent inwardly at substantially all of the edges of the sides of the front face and the back face of the lower lid to increase a bearing force of the exterior case against twisting.