Battery pack and electric device

A battery pack, comprising a battery pack container and battery cells accommodated in the battery pack container, wherein,

• an interior space of the battery pack container comprises a first region, a second region and a third region, first battery cells are arranged in the first region, second battery cells are arranged in the second region, third battery cells are arranged in the third region, the second battery cells are arranged surrounding the first battery cells, and the third battery cells are arranged surrounding the second battery cells, wherein,
• the first battery cells, the second battery cells and the third battery cells each has a first discharge voltage plateau and a second discharge voltage plateau, an average discharge voltage of the first discharge voltage plateau is higher than an average discharge voltage of the second discharge voltage plateau;
• the first battery cells, the second battery cells and the third battery cells each has a cathode active substance which is a mixture of a first cathode active substance having the first discharge voltage plateau and a cathode functional additive having the second discharge voltage plateau;
• the cathode functional additive is a titanium oxide, a niobium oxide or a titanium-niobium oxide;
• and
• in each of the first battery cells, the second battery cells and the third battery cells, when a sum of a discharge capacity corresponding to the first discharge voltage plateau and a discharge capacity corresponding to the second discharge voltage plateau is 100%, a proportion of the discharge capacity corresponding to the second discharge voltage plateau in the third battery cells>a proportion of the discharge capacity corresponding to the second discharge voltage plateau in the second battery cells>a proportion of the discharge capacity corresponding to the second discharge voltage plateau in the first battery cells.