Lithium ion power battery

Abstract

The invention discloses a lithium ion power battery comprising a battery core, a metal shell, an electrolyte and a top cover fixedly connected to the metal shell, wherein the battery core comprises apositive plate, a negative plate and a diaphragm; a positive tab and a negative tab are correspondinglydisposed the positive plate and the negative plate; the top cover is provided with a positive pole and a negative pole; 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 characteristics are that the negative plate is provided with heat-conducting heat collectors which are current collectors withthe positive current collectors with parts of the frontsurface and / or parts of the reverse surface uncoated with the negative active material layer, at least two or more heat-conductive heat collectors are stacked up and down in the same area to form a heat collecting channel capable of achievingheat conduction and heat collection, the heat collecting channel is provided with fluid channel members in a superposed or connected manner, and the fluid channel is exposed from the upper cover surface of the top cover of the shell. The lithium ion power battery can effectively solve the problems such as over-high or over-low temperature of the battery,and achieve the effects such as temperature control, prolongingof battery life and improvement of production efficiency.

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...

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