Lithium ion power battery

Abstract

The invention discloses a lithium ion power battery. The lithium ion power battery comprises a cell, a metal shell, an electrolyte and a top cover which is fixedly connected to the metal shell; the cell comprises a positive plate, a negative plate and a diaphragm; the negative plate comprises a negative current collector and a negative active material layer; the positive plate comprises a positivecurrent collector and a positive active material layer; the lithium ion power battery is characterized in that heat conducting and collecting bodies are arranged on each of the positive plate and thenegative plate; each heat conducting and collecting body is a current collector which is formed by not coating part of the front surface and/or the back surface of the positive current collector or the negative current collector with an active material layer; at least two or more heat conducting and collecting bodies are stacked into a heat confluence channel; the heat confluence channel is stacked or connected with a heat pipe which consists of a pipe shell and a liquid absorbing core; the heat confluence channels and the heat pipes form a heat confluence channel heat guide pipe assembly; the heat pipes of a positive electrode and a negative electrode are respectively positioned on the same side of a positive lug and a negative lug; and the heat pipe of the positive electrode and the heat pipe of the negative electrode extend out of the shell of the battery. According to the lithium ion power battery, the problems that the temperature of the battery is over-high or too low and the like can be effectively solved; and the effects of controlling the temperature, prolonging the service life of the battery and the like can be achieved.

Description

(1) Technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion power battery. (2) Background technology [0002] Transportation brings double pressure on energy crisis and environmental pollution. It is urgent to vigorously develop and research efficient, clean and safe new energy vehicles to achieve energy saving and emission reduction. Lithium-ion batteries have become the best candidates for new energy vehicle power systems due to their advantages such as high specific energy, no pollution, and no memory effect. However, lithium-ion batteries are very sensitive to temperature. Only in a suitable temperature range can the battery pack be discharged efficiently and maintain good performance. High temperature will make the aging speed of lithium-ion battery faster, the thermal resistance will increase faster, the number of cycles will be reduced, the service life will be shortened, and even cause problems such as battery thermal ru...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a lithium-ion power battery, which can effectively solve the problems of excessively high or low battery temperature, achieve temperature control and improve battery life, etc.

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