Battery placement rack and fire extinguishing device

A battery placement rack comprising:

• a first upright plate and a second upright plate spaced apart from each other in a lateral direction;
• a support plate configured to support a first battery unit, the support plate being coupled to the first upright plate and the second upright plate;
• and
• a first lateral guide plate disposed below the support plate in a vertical direction, wherein
• the support plate includes
• (i) a first end portion extending in the lateral direction and coupled to the first upright plate and the second upright plate,
• (ii) a second end portion provided opposite to the first end portion in a longitudinal direction of the support plate, the second end portion extending in the lateral direction and coupled to the first upright plate and the second upright plate, and
• (iii) an intermediate portion connecting the first end portion and the second end portion,
• a width of the intermediate portion in the lateral direction is smaller than a width of the first end portion and the second end portion,
• the support plate defines a first slot opening and a second slot opening, the first slot opening being located between the first upright plate and the intermediate portion of the support plate, the second slot opening being located between the second upright plate and the intermediate portion of the support plate,
• the first lateral guide plate is in contact with the first upright plate and extends in the lateral direction,
• the first lateral guide plate includes a first lateral guide plate main body and a first sub plate that is movable relative to the first lateral guide plate main body in the lateral direction,
• a first guide pin is fixed to the first lateral guide plate main body, and
• the first sub plate includes a first guide slot through which the first guide pin is inserted, the first guide slot extending in the lateral direction.