Lithium ion power battery

Abstract

The invention discloses a lithium ion power battery which comprises a cell, a metal shell, an electrolyte and a top cover fixedly connected on the metal shell. The cell comprises a positive electrodeplate, a negative electrode plate and a diaphragm. The positive electrode plate and the negative electrode plate are respectively provided with a positive tab and a negative tab. The top cover is provided with a positive pole and a negative pole. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer. The lithium ion power battery is characterized in that heat conduction collectors are arranged on thepositive electrode plate. The heat conduction collectors are current collectors of the positive electrode current collector and with front local parts or/and back local parts not coated with a positive electrode active material layer. At least two or more heat conduction collectors are stacked into a heat converging channel. A heat conducting part is stacked with or connected to the heat converging channel. The heat converging channel and the heat conducting part form a heat conducting and converging channel assembly. The problem of excessively high or low temperature of the battery can be effectively solved and the effect of achieving temperature control and improving the service life of the battery and improving the production efficiency can be 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.

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