INSULATION CASE STRUCTURE FOR BATTERY

An insulation case structure for a battery. The case structure includes an outer shell and an inner liner shell. A first opening is formed in one side of the outer shell. The inner liner shell is embedded into the outer shell through the first opening. A second opening that is arranged in the same direction as the first opening is formed in one end of the inner liner shell. A connection ring is arranged in a surrounding manner between a periphery of the inner liner shell that is located at the second opening and an inner wall of the outer shell. The connection ring and a peripheral wall of the inner liner shell are fixedly connected to each other by welding, and the connection ring and the inner wall of the outer shell are fixedly connected to each other by welding.