Lithium ion battery and manufacturing method therefor, and electric vehicle

A lithium ion battery, comprising a first metal plate, a second metal plate, a metal frame, a cell, poles, and an explosion-proof valve, wherein the first metal plate, the metal frame, and the second metal plate are sequentially connected to form a mounting chamber;

• the cell is accommodated in the mounting chamber;
• the poles are provided on the metal frame in an insulating manner and are electrically connected to the cell;
• the explosion-proof valve is provided on the metal frame;
• and the metal frame is provided with a liquid injection hole,
• wherein the first metal plate, the second metal plate and the metal frame are made of a stainless steel, wherein a thickness of the first metal plate is 0.02-0.2 mm, a thickness of the second metal plate is 0.02-0.2 mm, and a thickness of the metal frame is 0.10-1.00 mm, and a heat-conducting aluminum plate is not provided between the cell in the mounting chamber;
• wherein an insulating composite coating is provided on an outer surface of the first metal plate and an outer surface of the second metal plate, an outer surface of the insulating composite coating is a graphite thermal-conductive composite film or a graphene thermal-conductive composite film.