Heat treatment apparatus for manufacturing active material for secondary battery

A heat treatment apparatus comprising:

• a furnace body in which materials are transferred and heat treated;
• a roller disposed inside the furnace body and configured to transfer saggers in which the materials are received;
• a heater disposed inside the furnace body, the heater being disposed at a position spaced apart from the saggers and configured to heat the materials;
• an upper discharge pipe disposed on an upper part of the furnace body;
• a lower discharge pipe disposed on a lower part of the furnace body;
• and
• a lower supply pipe disposed on the lower part of the furnace body,
• wherein the furnace body comprises a plurality of areas having the upper discharge pipe and the lower discharge pipe,
• wherein the upper discharge pipe and the lower discharge pipe discharge an atmospheric gas from the furnace body and the lower supply pipe supplies the atmospheric gas into the furnace body,
• wherein a first direction is a width direction of the furnace body,
• wherein the plurality of areas comprising a first area to an Nth area (N is a natural number greater than or equal to 2) disposed sequentially along a second direction which is a transport direction of each of the materials,
• wherein the second direction is perpendicular to the first direction,
• wherein, in the second direction, a first length of the first area is shorter than a second length of a second area,
• wherein, in the second direction, a third length between a center of the lower supply pipe formed in the first area and a center of the upper discharge pipe formed therein is shorter than a fourth length between a center of the lower supply pipe formed in the second area or in each of the second area to the Nth area and a center of the upper discharge pipe formed therein, and
• wherein in each of the first area to the Nth area, the upper discharge pipe and the lower supply pipe are not arranged in a straight line in a third direction which is a height direction to be misaligned from each other.