The invention discloses a
lithium-
ion power battery, which comprises an electric core, a
metal housing, an
electrolyte and a top cover fixedly connected to the
metal housing, wherein the electric coreincludes a positive
pole piece, a negative
pole piece and a diaphragm; the positive
pole piece and the negative pole piece are respectively provided with a positive pole lug and a negative pole lug;the top cover is provided with a positive pole column and a negative pole column; the negative pole piece includes a negative
current collector and a negative active material layer; and the positive pole piece includes a
positive current collector and a positive active material layer. The
lithium-
ion power battery is characterized in that the positive pole piece is provided with
heat conducting and collecting bodies, the
heat conducting and collecting bodies are parts uncoated with the positive active material layer on the front or / and the back of the
positive current collector, at least two
heat conducting and collecting bodies are vertically laminated in the same area to form a
heat flow concentration channel, the
heat flow concentration channel is attached to the inner wall of the metalhousing, and the outer wall of the
metal housing is provided with a heat exchange device in the
heat flow concentration channel area. The
lithium-
ion power battery can effectively solve a problem that the battery temperature is too high or too low, and achieves the effects of controlling the temperature, prolonging the battery life and improving the production efficiency.