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 which are fixedly connected on the metal shell; the battery cell comprises a cathode piece, an anode piece and a separator; the cathode piece and the anode piece are respectively provided with a cathode tab and an anode tab; the top cover is provided with a cathode polar column and an anode polar column; the anode piece comprises an anode current collector and an anode active material layer; the cathode piece comprises a cathode current collector and a cathode active material layer, the anode piece is provided with heat conduction and heat collection bodies, the heat conduction and heat collection bodies are current collectors of the front surface or / and the reverse surfaces of the anode current collector being not partially coated with the anode active material layers, the at least two heat conduction and heat collection bodies arestacked to form a heat converge channel which is connected on the metal shell through a heat transfer part which is in electric insulation. The problem of the too high or too low temperature of the battery can be effectively solved, the temperature can be controlled, the life of the battery can be improved, and the production efficiency can be improved.

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...

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