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, whereinthe battery cell comprises a positive plate, a negative plate and a separator; a positive tab and a negative tab are respectively arranged on the positive plate and the negative plate; a positive pole and a negative pole are arranged on the top cover; the negative plate comprises a negative current collector and a negative active material layer; the positive plate comprises a positive current collector and a positive active material layer; the lithium ion power battery is characterized in that the positive plate is provided with a heat-conducting heat collector; the heat-conducting heat collector is a current collector that the front side part or / and the back side part of the positive current collector is / are not coated with the positive active material layer; at least two or more heat-conducting heat collectors are overlapped up and down in the same area to form a heat confluence channel; and the heat confluence channel is straight or bent to extend into the surplus electrolyte in the metal shell. The problems that the temperature of the 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. 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 bat...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a lithium-ion power battery, which can effectively solve the problems of high or low battery temperature, achieve temperature control, improve battery life and improve production efficiency, etc.

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