Hei Cha (or Heicha 黑茶) translates into Black (Hei) Tea (Cha) in English. It is however a class of teas quite different from the traditionally understood 'black tea'.
Based on the level of enzymes involved oxidization/fermentation occurred during the tea processing, teas are categorized into: green tea (绿茶), white tea(白茶), yellow tea(黄茶), Oolong tea (乌龙茶), black tea (红茶) and Hei Cha (黑茶).
The traditional 'black tea' in English is actually 红茶 (red tea) in Chinese. The Hei Cha (黑茶) is a class of teas that are produced in certain areas of China, processed to ferment years after their production. Hei Cha can be compressed (such as Fu Brick, Qian Liang Cha) or loose (such as Liu Bao or Tian Jian).
Following are some of the classic Chinese Hei Cha: