Lithium ion power battery

Abstract

The invention discloses a lithium ion power battery, comprising a battery cell, a metal shell, electrolyte and a top cover fixedly connected with the metal shell; the battery cell comprises a cathodepiece, an anode piece and a diaphragm; the cathode piece and the anode piece are respectively provided with a cathode lug and an anode lug; the top cover is provided with a cathode polar column and ananode 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; and the lithium ion power battery is characterized in that the cathode piece is provided with heat conducting heat collection bodies, each heat conducting heat collection body is a current collector formed by a local part, uncoated with the cathode active material layer, of the front or / and back of the cathode current collector, at least more than two heat conducting heat collection bodies arestacked up and down in the same region to form a heat concentration channel, the heat concentration channel is attached onto the inner wall of the metal shell, and a heat exchange device is arranged on the outer wall of the metal shell in a heat concentration channel region. The lithium ion power battery disclosed by the invention can effectively solve the problem that battery temperature is too high or too low and achieve the effects of controlling temperature, prolonging battery life and improving 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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