Battery housing, lithium battery and electronic product thereof

A battery housing, comprising:

• a housing, an accommodation cavity is formed in the housing, an upper end and a lower end of the housing each has an opening, and a first through hole is formed in a side wall of the housing;
• a first cover plate, the first cover plate is fixedly mounted at the upper end of the housing, and the first cover plate covers the opening at the upper end of the housing;
• a second cover plate, the second cover plate is fixedly mounted at the lower end of the housing, and the second cover plate covers the opening at the lower end of the housing;
• and
• the first cover plate is welded to an end face of the upper end of the housing, the second cover plate is welded to an end face of the lower end of the housing, a contact surface between the housing and the first cover plate is a horizontal plane, and a contact surface between the housing and the second cover plate is a horizontal plane.