Lithium ion power battery

Abstract

The invention discloses a lithium ion power battery. The lithium ion power battery comprises a battery cell, a metal shell, an electrolyte and a top cover fixedly connected to the metal shell. The battery cell comprises positive plates, negative plates and diaphragms, a positive electrode tab and a negative electrode tab are respectively arranged on the positive plates and the negative plates, each negative plate comprises a negative electrode current collector and a negative electrode active material layer, and each positive plate comprises a positive electrode current collector and a positive electrode active material layer. The power battery is characterized in that the negative plates are provided with heat-conducting heat collectors; the heat-conducting heat collectors are current collectors, wherein the front side part or / and the back side part of each negative electrode current collector is / are not coated with a negative electrode active material layer; at least two or more thantwo heat-conducting heat collectors are up-down overlapped in the same area to form heat conduction and collection heat confluence channels; the heat confluence channels are overlapped or connected with fluid flow channel components; and an inlet and an outlet of an fluid flow channel are formed in the lower side face of a positive pole or / and a negative pole. The problems that the temperature ofthe battery is too high or too low can be effectively solved, and the effects of controlling the temperature, prolonging the service life of the battery, improving the production efficiency and the like are achieved.

Description

[0001] (1) Technical field [0002] The invention relates to a lithium ion battery, in particular to a lithium ion power battery. [0003] (2) Background technology [0004] Transportation brings double pressure on energy crisis and environmental pollution, and 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 with high efficiency 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 problem...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies in 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, improve battery life and improve production efficiency, etc.

Images