Battery holder and side frame thereof

A battery holder, adapted to fix two juxtaposed battery assemblies, wherein each of the battery assemblies includes a plurality of battery modules arranged along a predetermined axial direction, the battery holder comprising:

• at least two connecting shafts, each of which extending along the predetermined axial direction, wherein the at least two connecting shafts respectively pass through the battery modules of each of the battery assemblies;
• a first lateral frame, including two side frames, wherein each of the side frames includes a main plate, a first side bar, and a second side bar;
• each of the main plates has a first blocking surface, and the first side bar and the second side bar are respectively connected to two opposite sides of the main plate;
• the first side bar has at least one first perforation, and the second side bar has at least one second perforation corresponding to the at least one first perforation;
• the at least one first perforation of the first side bar has a first width in the predetermined axial direction, and the at least one second perforation of the second side bar has a second width in the predetermined axial direction, wherein the first width is greater than the second width;
• the first side bar of one of the side frames is adjacent to the second side bar of the other of the side frames;
• an engaging member passes through the at least one first perforation of the first side bar and the at least one second perforation of the second side bar which are adjacent to each other to fix the first side bar to the second side bar;
• each of the at least two connecting shafts has one end connected to a corresponding one of the main plates of the side frames;
• and
• a second lateral frame, having two second blocking surfaces, wherein the second blocking surfaces respectively face toward the first blocking surface of the main plate of one of the side frames;
• each of the at least two connecting shafts has another end connected to the second lateral frame;
• the battery assemblies are respectively disposed between each of the first blocking surfaces and a corresponding one of the second blocking surfaces;
• wherein the side frames of the first lateral frame are movable in the predetermined axial direction along the first width of the at least one first perforation, thereby adjusting a distance between the first lateral frame and the second lateral frame;
• wherein both of the first side bar and the second side bar extend alone another axial direction, and the another axial direction is perpendicular to the predetermined axial direction;
• in the another axial direction, a height of the at least one first perforation is the same as a height of the at least one second perforation;
• wherein each of the at least two connecting shafts has two opposing ends which are fastenable to the first lateral frame and the second lateral frame such that the battery assemblies are connected in a fixed position without a frame between the adjacent battery modules when assembled.